Filed Pursuant to Rule 424(b)(7)
Registration No. 333-214988

The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus do not constitute an offer to sell these securities and we and the selling stockholder are not soliciting offers to buy these securities in any jurisdiction where the offer or sale is not permitted.

Subject to Completion, dated August 13, 2018

PRELIMINARY PROSPECTUS SUPPLEMENT

(To Prospectus dated January 6, 2017)

2,100,000 Shares

Common Stock

This is a public offering of shares of common stock of Addus HomeCare Corporation.

We are offering 1,075,267 shares of our common stock. The selling stockholder identified in this prospectus supplement is offering an additional 1,024,733 shares of our common stock. We will not receive any proceeds from the sale of our common stock by the selling stockholder.

Our common stock is currently listed on The Nasdaq Global Select Market under the symbol “ADUS.” The last reported sale price of our common stock on August 10, 2018 was $64.15 per share.

Investing in our common stock involves a high degree of risk. Please read “Risk Factors” beginning on page S-9 of this prospectus supplement and in the documents incorporated by reference into this prospectus supplement.

We have granted the underwriters an option exercisable for a period of 30 days after the date of this prospectus supplement to purchase, from time to time, in whole or in part, up to an aggregate of 315,000 additional shares from us at the public offering price less underwriting discounts and commissions. If the underwriters exercise the option in full, the total underwriting discounts and commissions payable by us will be $         million and the total proceeds to us, before expenses, will be $         million.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities, or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

Delivery of the shares of common stock is expected to be made on or about                 , 2018.

Prospectus Supplement dated                 , 2018.

TABLE OF CONTENTS

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You should rely only on the information contained in or incorporated by reference in this prospectus supplement, the accompanying prospectus and in any free writing prospectus that we and the selling stockholder have authorized for use in connection with this offering. Neither we, nor the selling stockholder nor any of the underwriters have authorized anyone to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it.

Neither we, nor the selling stockholder, nor the underwriters are making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information in this prospectus supplement, the accompanying prospectus, the documents incorporated by reference in the accompanying prospectus and any free writing prospectus that we have authorized for use in connection with this offering is accurate only as of the date of those respective documents. Our business, financial condition, results of operations and prospects may have changed since those dates. You should read this prospectus supplement, the accompanying prospectus, the documents incorporated by reference in the accompanying prospectus, and any free writing prospectus that we have authorized for use in connection with this offering, in their entirety before making an investment decision. You should also read and consider the information in the documents to which we have referred you in the section of the prospectus supplement entitled “Incorporation of Certain Information by Reference” and in the sections of the accompanying prospectus entitled “Where You Can Find More Information” and “Incorporation of Certain Information by Reference.”

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ABOUT THIS PROSPECTUS SUPPLEMENT

This prospectus supplement and the accompanying prospectus form part of a registration statement on Form S-3 that we filed with the Securities and Exchange Commission, or the “SEC”, using a “shelf” registration process. This document contains two parts. The first part consists of this prospectus supplement, which provides you with specific information about this offering. The second part, the accompanying prospectus, provides more general information, some of which may not apply to this offering. Generally, when we refer only to the “prospectus,” we are referring to both parts combined. This prospectus supplement may add, update or change information contained in the accompanying prospectus. To the extent that any statement we make in this prospectus supplement is inconsistent with statements made in the accompanying prospectus or any documents dated prior to the date of this prospectus supplement and incorporated by reference herein or therein, the statements made in this prospectus supplement will be deemed to modify or supersede those made in the accompanying prospectus and such documents incorporated by reference herein and therein.

This prospectus supplement and the accompanying prospectus are an offer to sell only the shares offered hereby, but only under circumstances and in jurisdictions where it is lawful to do so. The distribution of this prospectus supplement, the accompanying prospectus and any free writing prospectus that we have authorized for use in connection with this offering and the offering of our common stock in certain jurisdictions may be restricted by law. If you possess this prospectus supplement, the accompanying prospectus or any free writing prospectus that we have authorized for use in connection with this offering, you should find out about and observe these restrictions. This prospectus supplement and the accompanying prospectus do not constitute, and may not be used in connection with, an offer or solicitation by anyone in any jurisdiction in which such offer or solicitation is not authorized or in which the person making such offer or solicitation is not qualified to do so or to any person to whom it is unlawful to make such offer or solicitation.

You should not consider any information in this prospectus supplement or the accompanying prospectus to be investment, legal or tax advice. You should consult your own counsel, accountant and other advisors for legal, tax, business, financial and related advice regarding the purchase of the common stock. Neither we, the selling stockholder, nor the underwriters are making any representation to you regarding the legality of an investment in the common stock by you under applicable investment or similar laws.

In this prospectus supplement, “Addus,” the “Company,” “we,” “us,” and “our” and similar terms refer to Addus HomeCare Corporation and its consolidated subsidiaries, unless the context indicates otherwise. References to our “common stock” refer to the common stock of Addus HomeCare Corporation.

All references in this prospectus supplement to our financial statements include, unless the context indicates otherwise, the related notes. The industry and market data and other statistical information contained in this prospectus supplement, the accompanying prospectus and the documents we incorporate by reference are based on management’s own estimates, independent publications, government publications, reports by market research firms or other published independent sources, and, in each case, are believed by management to be reasonable estimates. Although we believe these sources are reliable, we have not independently verified the information. We note that our estimates involve risks and uncertainties and are subject to change based on various factors, including those discussed in the risk factors contained and incorporated by reference herein.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus supplement and the accompanying prospectus contain or incorporate by reference forward-looking statements that involve risks and uncertainties, as well as assumptions that, if they never materialize or prove incorrect, could cause our results to differ materially from those expressed or implied by such forward-looking statements. All statements that are not purely historical are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, or Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or Exchange Act. Forward-looking statements are often identified by the use of words such as, but not limited to, “anticipate,” “believe,” “can,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “will,” “plan,” “project,” “seek,” “should,” “target,” “will,” “would,” and similar expressions or variations intended to identify forward-looking statements, although not all forward-looking statements contain these

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identifying words. These statements are based on the beliefs and assumptions of our management based on information currently available to management. Such forward-looking statements are subject to risks, uncertainties and other important factors that could cause actual results and the timing of certain events to differ materially from future results expressed or implied by such forward-looking statements. These risks and uncertainties include, but are not limited to the following: changes in operational and reimbursement processes at the state or federal levels, changes in Medicaid, Medicare, managed care organizations and other government program policies and payment rates, changes in or our failure to comply with existing federal and state laws or regulations or the failure to comply with new government laws or regulations on a timely basis, competition in the healthcare industry, the geographical concentration of our operations, changes in the case mix of consumers and payment methodologies, operational changes resulting from the assumption by managed care organizations of responsibility for managing and paying for healthcare and personal care services to consumers, the nature and success of future financial and/or delivery system reforms, changes in estimates and judgments associated with critical accounting policies, our ability to maintain or establish new referral sources, our ability to renew significant agreements or groups of agreements, our ability to attract and retain qualified personnel, city and state minimum wage pressure, changes in payments and covered services due to the overall economic conditions and deficit spending by federal and state governments, future cost containment initiatives undertaken by third party payors, our ability to access financing through the capital and credit markets, our ability to meet debt service requirements and comply with covenants in debt agreements, business disruptions due to natural disasters or acts of terrorism, our ability to integrate and manage our information systems, our expectations regarding the size and growth of the market for our services, the acceptance of privatized social services, our expectations regarding changes in reimbursement rates, eligibility standards and limits on services imposed by state governmental agencies, any failure of Illinois to enact a minimum wage offset and/or the timing of any such enactment the potential for litigation, our ability to successfully implement our business model to grow our business, our ability to continue identifying, pursuing and integrating acquisition opportunities and expand into new geographic markets, the impact of acquisitions on our business, the effectiveness, quality and cost of our services, any failure of Illinois to enact a minimum wage offset and/or the timing of any such enactment, and other risk factors detailed from time to time in our filings with the SEC. In addition, the factors described under the section captioned “Risk Factors” in this prospectus supplement, as may be updated from time to time by our future filings under the Exchange Act, and elsewhere in the documents incorporated by reference in this prospectus supplement, may result in these differences. You should carefully review all of these factors. These forward-looking statements were based on information, plans and estimates at the date of this prospectus supplement or the other document containing the forward-looking statement, and we assume no obligation to update any forward-looking statements to reflect changes in underlying assumptions or factors, new information, future events or other changes, except as may be required by law.

TRADEMARKS

We own or have rights to trademarks or trade names that we use in conjunction with the operation of our business. In addition, our name, logo and website name and address are our service marks or trademarks. Solely for convenience, the trademarks, service marks, trade names and copyrights referred to or incorporated by reference in this prospectus supplement may be listed without the ^©, ^® and ™ symbols, but we will assert, to the fullest extent under applicable law, our rights to these trademarks, service marks, trade names and copyrights. This prospectus supplement may also include trademarks, service marks or trade names of other companies. Each trademark, trade name or service mark by any other company appearing in this prospectus supplement, including those documents incorporated by reference belongs to its holder.

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RISK FACTORS

An investment in our common stock involves a high degree of risk. Before deciding whether to invest in our common stock, you should consider carefully the risks described below and discussed under the section captioned “Risk Factors” contained in our filings with the SEC, which are incorporated by reference in their entirety, together with other information in this prospectus supplement, the accompanying prospectus, the information and documents incorporated by reference, and any free writing prospectus that we have authorized for use in connection with this offering. The risks and uncertainties we have described are not the only ones we face. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also affect our operations. If any of these risks actually occur, our business, financial condition, results of operations or cash flow could be seriously harmed. This could cause the trading price of our common stock to decline, resulting in a loss of all or part of your investment.

This prospectus supplement, the accompanying prospectus and the incorporated documents also contain forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of certain factors, including the risks mentioned below. Forward-looking statements included in this prospectus supplement are based on information available to us on the date hereof, and all forward-looking statements in documents incorporated by reference are based on information available to us as of the date of such documents. We disclaim any intent to update any forward-looking statements.

Risks Related to Our Business and Industry

Reductions in reimbursement and other changes to Medicaid, Medicaid waiver, Medicare and other federal, state and local medical and social programs could adversely affect our consumer caseload, units of service, net service revenues, gross profit and profitability.

A significant portion of our caseload and net service revenues are derived from government healthcare programs, primarily Medicaid and Medicaid waiver programs. For the year ended December 31, 2017, we derived approximately 64.2% of our net service revenues from state and local governmental agencies, primarily through Medicaid and Medicaid waiver programs. However, changes in government healthcare programs may decrease the reimbursement we receive or limit access to our services. As federal healthcare expenditures continue to increase and state governments face budgetary shortfalls, federal and state governments have made, and may continue to make, significant changes to the Medicaid and Medicare programs and reimbursement received for services rendered to beneficiaries of such programs. For example, the Budget Control Act of 2011 requires automatic spending reductions to reduce the federal deficit, including Medicare spending reductions of up to 2% per fiscal year, with a uniform percentage reduction across all Medicare programs. CMS began imposing a 2% reduction on Medicare claims on April 1, 2013; these reductions have been extended through 2027.

The Medicaid program, which is jointly funded by federal and state governments, is often a state’s largest program. Governmental agencies generally condition their agreements upon a sufficient budgetary appropriation. Almost all of the states in which we operate have experienced periodic financial pressures and budgetary shortfalls due to challenging economic conditions and the rising costs of healthcare. Reductions to federal support for state Medicaid or other programs could also result in budgetary shortfalls. As a result, many states have made, are considering or may consider making changes in their Medicaid, Medicaid waiver or other state and local medical and social programs, including enacting legislation designed to reduce Medicaid expenditures.

Changes that may occur at the federal or state level to address budget deficits or otherwise contain costs include:

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Certain of these measures have been implemented by, or are proposed in, states in which we operate. In 2017, we derived approximately 52.6% of our total net service revenues from services provided in Illinois, 13.7% of our total net service revenues in New York and 8.8% of our total net service revenues in New Mexico. Because a substantial portion of our business is concentrated in these states, any significant reduction in expenditures that pay for our services in these states and other states in which we do business may have a disproportionately negative impact on our future operating results. Illinois, in particular, operated without a state budget for fiscal years 2016 and 2017. The Illinois legislature has enacted comprehensive state budgets for fiscal years 2018 and 2019. However, there can be no guarantee that Illinois will pass budgets in subsequent years.

The Patient Protection and Affordable Care Act (“ACA”) made significant changes to Medicaid and Medicare policy and funding, among other broad changes across the healthcare industry, promoting a shift toward value-based care, including implementation of alternative payment models. The ACA also resulted in expanded Medicaid eligibility in many states and the establishment of various demonstration projects and Medicaid waiver programs under which states may apply to test new or existing approaches to payment and delivery of Medicaid benefits. CMS has indicated that it will look to states to drive innovation and value through such waivers, and has taken steps to update program management, the waiver and state plan amendment approval process, and quality reporting, but the extent and effect of these changes remains uncertain. Future health reform efforts or efforts to repeal or significantly change the ACA will likely impact both federal and state programs.

If changes in Medicaid, Medicare or other state and local medical and social programs result in a reduction in available funds for the services we offer or a reduction in the number of beneficiaries eligible for our services, our net service revenues could be negatively impacted. Our profitability depends principally on the levels of government-mandated payment rates and our ability to manage the cost of providing services. In some cases, commercial insurance companies and other private payors rely on government payment systems to determine payment rates. As a result, changes to government healthcare programs that reduce Medicaid, Medicare or other payments may negatively impact payments from private payors, as well. Any reduction in reimbursements or imposition of copayments that dissuade the use of our services, or any reduction in reimbursement from private payors, could materially adversely affect our profitability.

The implementation of alternative payment models and the transition of Medicaid and Medicare beneficiaries to managed care organizations may limit our market share and could adversely affect our revenues.

Many government and commercial payors are transitioning providers to alternative payment models that are designed to promote cost-efficiency, quality and coordination of care. For example, accountable care organizations (“ACOs”) incentivize hospitals, physician groups, and other providers to organize and coordinate patient care while reducing unnecessary costs. Several states have implemented, or plan to implement, accountable care models for their Medicaid populations. If we are not included in these programs, or if ACOs establish programs that overlap with our services, we are at risk for losing market share and for a loss of our current business.

We may be similarly impacted by increased enrollment of Medicare and Medicaid beneficiaries in managed care plans, shifting away from traditional fee-for-service models. Under the managed Medicare program, also known as Medicare Advantage, the federal government contracts with private health insurers to provide Medicare benefits. Insurers may choose to offer supplemental benefits and impose higher plan costs on beneficiaries. Approximately one third of Medicare beneficiaries were enrolled in a Medicare Advantage plan in 2018, a figure that is expected to increase. Enrollment in managed Medicaid plans is also growing, as states are increasingly relying on managed care organizations to deliver Medicaid program services as a strategy to control costs and manage resources. We cannot assure you that we will be able to secure favorable contracts with all or some of the managed care organizations, that our reimbursement under these programs will remain at current levels, that the authorizations for services will remain at current levels or that our profitability will remain at levels consistent with past performance. In addition, operational processes may not be well defined as a state transitions beneficiaries to managed care. For example, membership, new referrals and the related authorization for services to be provided may be delayed, which may

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result in delays in service delivery to consumers or in payment for services rendered. Difficulties with operational processes may negatively affect our revenue growth rates, cash flow and profitability for services provided.

Other alternative payment models may be presented by the government and commercial payors to control costs that subject our company to financial risk. We cannot predict at this time what effect alternative payment models may have on our company.

Our revenues are concentrated in a small number of states which will make us particularly sensitive to regulatory and economic changes in those states.

Our revenues are particularly sensitive to regulatory and economic changes in states in which we generate a significant portion of our revenues including Illinois, New York and New Mexico. Accordingly, any change in the current demographic, economic, competitive or regulatory conditions in these states could have an adverse effect on our business, financial condition or results of operations. Changes to the Medicaid programs in these states could also have a disproportionately adverse effect on our business, financial condition, results of operations or cash flows.

Efforts to reduce the costs of the Illinois Department on Aging programs could adversely affect our service revenues and profitability.

For the years ended December 31, 2017 and 2016, we derived approximately 36.6% and 42.1%, respectively, of our revenue from the Illinois Department on Aging programs. The Governor of Illinois has proposed changes in recent years aimed at reducing expenditures by the Illinois Department on Aging, such as an income cap and higher threshold of need for eligibility in the Department on Aging’s Community Care Program which provides in-home adult day services and case management. Other strategies to reduce costs associated with the Illinois Department on Aging include shifting services to managed care organizations and implementing a Community Care Program Medicaid Initiative to enroll eligible individuals in Medicaid. The nature and extent of future cost reduction initiatives is unknown. If future reforms impact the eligibility of consumers for services, the number of hours authorized or otherwise restrict services provided to existing consumers, our service revenues and growth may be adversely affected.

Delays in reimbursement due to state budget deficits may increase in the future, adversely affecting our liquidity.

There is a delay between the time that we provide services and the time that we receive reimbursement or payment for these services. Many of the states in which we operate are operating with budget deficits for their current fiscal year. These and other states may in the future delay reimbursement, which would adversely affect our liquidity. In addition, from time to time, procedural issues require us to resubmit claims before payment is remitted, which contributes to our aged receivables. Additionally, unanticipated delays in receiving reimbursement from state programs due to changes in their policies or billing or audit procedures may adversely impact our liquidity and working capital. We fund operations primarily through the collection of accounts receivable.

Specifically, the State of Illinois’s payments for non-Medicaid consumers have been delayed in the past and may continue to be delayed in the future due to budget disputes that began in 2015. The State of Illinois did not adopt a comprehensive budget for fiscal years 2016 or 2017, but passed state budgets for each of fiscal years 2018 and 2019.

Failure to renew a significant agreement or group of related agreements may materially impact our revenue.

For the year ended December 31, 2017, we derived approximately 36.6% of our net service revenues under agreements with the Illinois Department on Aging. Each of our agreements is generally in effect for a specific term.

Even though our agreements are for a specific term, they are generally terminable with 60 days’ notice. Our ability to renew or retain our agreements depends on our quality of service and reputation, as well as other factors over which we have little or no control, such as state appropriations and changes in provider eligibility requirements. Additionally, failure to satisfy any of the numerous technical renewal requirements in connection with our proposals for agreements could result in a proposal being rejected even if it contains favorable pricing terms. Failure to obtain, renew or retain agreements with major payors may negatively impact our results of operations and revenue. We can give no assurance these agreements will be renewed on commercially reasonable terms or at all.

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We could face a variety of risks by expanding into new lines of business.

In 2018, we expanded our lines of business to include hospice and home health with the acquisition of Ambercare Corporation and we acquired staffing operations as part of our Arcadia transaction. Risks of our entry into the hospice and home health segments and adding staffing operations to our home care segment include, without limitation, difficulties integrating new businesses with our ongoing operations; potential diversion of management’s time and other resources from our existing personal care business; the need for additional capital and other resources to expand into these new lines of business; and inefficient integration of operational and management systems and controls. In addition, new businesses that we acquire may have unknown or contingent liabilities, including liabilities for failure to comply with healthcare and other laws and regulations, professional liabilities, workers’ compensation liabilities, and tax liabilities. Although we generally attempt to exclude significant liabilities from our acquisitions in the case of acquisitions structured as asset sales and seek indemnification from sellers or insurance protection, we may nevertheless have material liabilities for past activities of acquired businesses. Entry into a new line of business may also subject us to new laws and regulations with which we are not familiar and may lead to increased litigation and regulatory risk.

Our industry is highly competitive, fragmented and market-specific.

We compete with personal care service providers, hospice providers, home health providers, private caregivers, larger publicly held companies, privately held companies, privately held single-site agencies, hospital-based agencies, not-for-profit organizations, community-based organizations and self-directed care programs. Some of our competitors may have greater financial, technical, political and marketing resources, name recognition or a larger number of consumers and payors than we do. In addition, some of these organizations offer more services than we do in the markets in which we operate. These competitive advantages may limit our ability to attract and retain referrals in local markets and to increase our overall market share.

In many states, there are limited barriers to entry in providing personal care services. However, some states require entities to obtain a license before providing home care services. Licensure is generally required of agencies providing home health and hospice services, though requirements vary by state. Economic changes such as increases in minimum wage and changes in Department of Labor rules can also impact the ease of entry into a market. These factors may affect competition in our states.

Often our contracts with payors are not exclusive. Local competitors may develop strategic relationships with referral sources and payors. This could result in pricing pressures, loss of or failure to gain market share or loss of consumers or payors, any of which could harm our business. In addition, existing competitors may offer new or enhanced services that we do not provide, or be viewed by consumers as a more desirable local alternative. The introduction of new and enhanced service offerings, in combination with the development of strategic relationships by our competitors, could cause a decline in revenue, a loss of market acceptance of our services and a negative impact on our results of operations.

If we fail to comply with the laws and extensive regulations governing our business, we could be subject to penalties or be required to make changes to our operations, which could negatively impact our profitability.

The federal government and the states in which we operate regulate our industry extensively. The laws and regulations governing our operations, along with the terms of participation in various government programs, impose certain requirements on the way in which we do business, the services we offer, and our interactions with providers and consumers. These requirements include matters related to:

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These laws include, but are not limited to:

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We currently have contractual relationships with current and potential referral sources, including hospitals and health systems, skilled nursing facilities and certain physicians who provide medical director services to our Company, and we cannot assure you that courts or regulatory agencies will not interpret these laws in ways that will implicate our arrangements. Federal and state government agencies have heightened and coordinated civil and criminal enforcement efforts throughout the healthcare industry. While we endeavor to comply with applicable laws and regulations, we cannot assure you that our practices are fully compliant or that courts or regulatory agencies will not interpret those laws and regulations in ways that will adversely affect our practices. Also, the laws and regulations governing our business are subject to change, interpretations may evolve and enforcement focus may shift. These changes could subject us to allegations of impropriety or illegality, require restructuring of relationships with referral sources and providers or otherwise require changes to our operations. Failure to comply with applicable laws and regulations could lead to civil sanctions and criminal penalties, the termination of rights to participate in federal and state-sponsored programs, exclusion from federal healthcare programs, the suspension or revocation of licenses and nonpayment or delays in our ability to bill and collect for services provided, any of which could adversely affect our business, results of operations, or financial results.

In addition, as a result of our participation in Medicaid, Medicaid waiver, Medicare and Veterans Health Administration programs and other state and local governmental programs, and pursuant to certain of our contractual relationships, we are subject to various reviews, compliance audits and investigations by governmental authorities and other third parties to verify our compliance with these programs and agreements as well as applicable laws, regulations and conditions of participation. Each of our home care and hospice agencies must comply with the extensive conditions of participation in the Medicare program. If any of our agencies fail to meet any of the conditions of participation or coverage with respect to state licensure or our participation in Medicaid, Medicaid waiver, Medicare programs, Veterans Health Administration programs and other state and local governmental programs, we may receive a notice of deficiency from the applicable surveyor or authority. Failure to institute a plan of action to correct the deficiency within the period provided by the surveyor or authority could result in civil or criminal penalties, the imposition of fines or other sanctions, damage to our reputation, cancellation of our agreements, suspension or revocation of our licenses or disqualification from federal and state reimbursement programs. These actions may adversely affect our ability to provide certain services, to receive payments from other payors and to continue to operate. Additionally, failure to comply with the conditions of participation related to enrollment could result in a deactivation or revocation of billing privileges. To the extent that billing privileges are revoked, there is a mandated one to three-year bar to re-enrollment. Similarly, we could face liability under the False Claims Act if we submit claims to Medicare or Medicaid while not in compliance with certain conditions of participation that would cause the government to refuse payment. Further, actions taken against one of our offices may subject our other offices to adverse consequences. We may also fail to discover all instances of noncompliance by our acquisition targets, which could subject us to adverse remedies once those acquisitions are complete. Any termination of one or more of our offices from any federal, state or local program for failure to satisfy such program’s conditions of participation could adversely affect our net service revenues and profitability.

Delays in reimbursement may cause liquidity problems.

There are delays in reimbursement from the time we provide services to the time we receive reimbursement or payment for these services. Delays may result from changes by payors to data submission requirements or requests by fiscal intermediaries for additional data or documentation, among other issues. If we have information system problems or issues that arise with Medicare or Medicaid, we may encounter delays in our payment cycle. Such timing delays may cause working capital shortages. Working capital management, including prompt and diligent billing and collection, is an important factor in our results of operations and liquidity. System problems, Medicare or Medicaid issues or industry trends may extend our collection period, adversely impact our working capital. Our working capital management procedures may not successfully negate this risk. There are often timing delays when attempting to collect funds from Medicaid programs. Delays in receiving reimbursement or payments from these programs may adversely impact our working capital.

We are and have been subject to routine and periodic surveys, audits and investigations by various governmental agencies. In addition to surveys to determine compliance with the conditions of participation, CMS has engaged a number of contractors (including Medicare Administrative Contractors, Recovery Audit Contractors, Zone Program Integrity Contractors, and Medicaid Integrity Contractors) to conduct audits to evaluate billing practices and identify

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overpayments. These audits can result in recoupments by Medicare and other payors of amounts previously paid to us. In addition to audits by CMS contractors, individual states are implementing similar integrity programs using Medicaid Recovery Audit Contractors. We are unable to predict what additional government regulations, if any, affecting our business may be enacted in the future, how existing or future laws and regulations might be interpreted or whether we will be able to comply with such laws and regulations either in the markets in which we presently conduct, or wish to commence, business. In June 2016, CMS announced its plans to implement a three-year “Pre-Claim Review Demonstration of Home Health Services” in certain states, including Illinois. The demonstration, which involves clinical documentation requirements, seeks to improve identification, investigation, and prosecution of Medicare fraud among home health agencies and to reduce expenditures while maintaining or improving quality of care. The demonstration began in Illinois in August 2016, but CMS paused it in April 2017 and has refrained from expanding the demonstration to other states. In May 2018, CMS proposed a “Review Choice Demonstration for Home Health Services,” which is a revised version of the demonstration that will give providers the option of pre-claim review, post-payment review, or minimal post-payment review with a 25% payment reduction for all home health services. The revised demonstration will be implemented in Illinois, Ohio, North Carolina, Florida, and Texas for five years. We are currently unable to predict what impact, if any, this program may have on its result of operations or financial position when and if resumed.

We are subject to federal and state laws that govern our employment practices, including minimum wage and local living wage ordinances. Failure to comply with these laws, or changes to these laws that increase our employment-related expenses, could adversely impact our operations.

We are required to comply with all applicable federal and state laws and regulations relating to employment, including occupational safety and health requirements, wage and hour and other compensation requirements, employee benefits, providing leave and sick pay, employment insurance, proper classification of workers as employees or independent contractors, immigration and equal employment opportunity laws. These laws can vary significantly among states and can be highly technical. Costs and expenses related to these requirements are a significant operating expense and may increase as a result of, among other things, changes in federal or state laws or regulations requiring employers to provide specified benefits to employees, increases in the minimum wage and local living wage ordinances, increases in the level of existing benefits or the lengthening of periods for which unemployment benefits are available. We may not be able to offset any increased costs and expenses. Furthermore, any failure to comply with these laws, including even a seemingly minor infraction, can result in significant penalties which could harm our reputation and have a material adverse effect on our business.

On December 2nd, 2014, the Chicago City Council passed an ordinance that will raise the minimum wage for Chicago workers to $13 per hour by 2019, with increases up to $1 per hour effective on July 1 of each year such that the rate is $12 per hour effective as of July 1, 2018. The wage increases in 2015 and 2016 did not have a material impact on the Company because of our existing wage scale, and the 2017 wage increase was offset by a rate increase in the 2018 fiscal year Illinois budget that was specifically intended to be passed through as wage increases. In the budget process for the 2019 fiscal year budget, a similar provision was proposed but was not included in the final 2019 fiscal year budget. We believe that there is legislative support for an increase and anticipate that a pass-through increase to offset the wage increase could be passed in a November session or, more likely, in the first half of 2019. However, there is no guarantee that a rate increase will pass at all or as to the timing of any such rate increase. Until such time that any such offsetting rate increase occurs, we anticipate a decrease to our overall margins of approximately 70 basis points as the result of the most recent minimum wage increase.

In addition, certain individuals and entities, known as excluded persons, are prohibited from receiving payment for their services rendered to Medicaid, Medicare and other federal and state healthcare program beneficiaries. If we inadvertently hire or contract with an excluded person, or if any of our current employees or contractors becomes an excluded person in the future without our knowledge, we may be subject to substantial civil penalties, including up to $11,052 for each item or service furnished by the excluded individual to a federal or state healthcare program beneficiary, an assessment of up to three times the amount claimed and exclusion from the program.

Under the ACA, each of our subsidiaries that employ an average of at least 50 full-time employees in a calendar year (“EIN’s”) are required to offer a minimum level of health coverage for 95% of our full-time employees in 2017 or be subject to an annual penalty. For the year ended December 31, 2017, we provided an offer of coverage to at least 95% of our full-time employees, averaged across eleven entities.

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Our business may be adversely impacted by healthcare reform efforts, including repeal of or significant modifications to the ACA.

In recent years, the U.S. Congress and certain state legislatures have considered and passed a large number of laws intended to result in significant change to the healthcare industry. However, there is significant uncertainty regarding the future of the ACA, the most prominent of these reform efforts. The current presidential administration and certain members of Congress have stated their intent to repeal or make significant changes to the ACA, its implementation and its interpretation. In addition, the president signed an executive order that directs agencies to minimize “economic and regulatory burdens” of the ACA. The presidential administration and the U.S. Congress may take further action regarding the ACA, including, but not limited to, repeal or replacement. Most recently, the Tax Cuts and Jobs Acts was enacted, which, among other things, removes penalties for not complying with the ACA’s individual mandate to carry health insurance. Additionally, all or a portion of the ACA and related subsequent legislation may be modified, repealed or otherwise invalidated through further legislation or judicial challenge, which could result in lower numbers of insured individuals, and reduced coverage for insured individuals. Further legislation or regulation could be passed that could harm our business, financial condition and results of operations. Other legislative changes have been proposed and adopted since the ACA was enacted. For example, the Budget Control Act of 2011 included aggregate reductions to Medicare payments to providers of 2% per fiscal year, which went into effect beginning on April 1, 2013 and have been extended through 2027. The American Taxpayer Relief Act of 2012 further reduced Medicare payments to several types of providers, including hospitals, imaging centers and cancer treatment centers, and increased the statute of limitations period for the government to recover non-fraudulent overpayments to providers from three to five years.

There is uncertainty regarding whether, when, and how the ACA will be further changed, what alternative provisions, if any, will be enacted, and the impact of alternative provisions on providers and other healthcare industry participants. Government efforts to repeal or change the ACA or to implement alternative reform measures could cause our net revenues to decrease. Furthermore, we are unable to predict the nature and success of future financial or delivery system reforms that may be implemented by other, non-governmental industry participants.

Our hospice operations are subject to annual Medicare caps. If we exceed the caps, our business and consolidated financial condition, results of operations and cash flows could be materially adversely affected.

Overall payments made by Medicare to each hospice provider number (generally corresponding to each of our hospice agencies) are subject to an overall payment cap amount, which is calculated and published by the Medicare fiscal intermediary on an annual basis covering the period from November 1 through October 31. If payments received under any of our hospice provider numbers exceed these caps, we may be required to reimburse Medicare such excess amounts, which could have a material adverse effect on our business and consolidated financial condition, results of operations and cash flows.

Negative publicity or changes in public perception of our services may adversely affect our ability to obtain new agreements and renew existing agreements.

Our success in obtaining new agreements and renewing our existing agreements depends upon maintaining our reputation as a quality service provider among governmental authorities, physicians, hospitals, discharge planning departments, case managers, nursing homes, rehabilitation centers, advocacy groups, consumers and their families, other referral sources and the public. While we believe that the services that we provide are of high quality, if studies mandated by Congress in the ACA to make public quality measures are implemented and if our quality measures are deemed to be not of the highest value, our reputation could be negatively affected. Negative publicity, changes in public perceptions of our services or government investigations of our operations could damage our reputation and hinder our ability to retain agreements or obtain new agreements. Increased government scrutiny may also contribute to an increase in compliance costs and could discourage consumers from using our services. Any of these events could have a negative effect on our business, financial condition and operating results.

In addition, in connection with the sale of our home health skilled nursing business (“Home Health Business”), we granted a license to subsidiaries of the LHC Group, Inc. (“LHC”) that allowed them to use certain of our intellectual property, including the Addus name, for the provision of skilled nursing and related physical therapy healthcare services to individuals in their homes and hospice services in California and Illinois. This license expired on April 1, 2018. Although the use of the intellectual property was required to be consistent and at least equal to the level of quality and brand perception prior to the sale, we did not have operational control over LHC. As a result, home

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health agencies operated by LHC may not have been operated in a manner consistent with the standards we uphold at our agencies. If such agencies did not maintain operational standards consistent with the standards we demand of our agencies, the image and brand reputation of Addus may have been negatively impacted and our business may be materially affected.

Our growth strategy depends on our ability to manage growing and changing operations and we may not be successful in managing this growth.

Our business plan calls for significant growth in business over the next several years through the expansion of our services in existing markets and the establishment of a presence in new markets. This growth would place significant demands on our management team, systems, internal controls and financial and professional resources. In addition, we will need to further develop our financial controls and reporting systems to accommodate any such future growth. This could require us to incur expenses for hiring additional qualified personnel, retaining professionals to assist in developing the appropriate control systems and expanding our information technology infrastructure. Our inability to effectively manage growth could have a material adverse effect on our financial results.

Future acquisitions or growth initiatives may be unsuccessful and could expose us to unforeseen liabilities.

Our growth strategy includes geographical expansion into new markets and the addition of new services in existing markets through the acquisition of local service providers. These acquisitions involve significant risks and uncertainties, including difficulties assimilating acquired personnel and other corporate cultures into our business, the potential loss of key employees or consumers of acquired providers, and the assumption of liabilities and exposure to unforeseen liabilities of acquired providers. In the past, we have made acquisitions that have not performed as expected or that we have been unable to successfully integrate with our existing operations. In addition, our due diligence review of acquired businesses may not successfully identify all potential issues. The failure to effectively integrate future acquisitions could have an adverse impact on our operations.

We have grown our business through de novo offices and we may in the future selectively open new offices in existing and new states. De novo offices involve risks, including those relating to accreditation, hiring new personnel, establishing relationships with referral sources and delays or difficulty in installing our operating and information systems. We may not be successful in establishing de novo offices in a timely manner due to generating insufficient business activity and incurring higher than projected operating cost that could have a material adverse effect on our financial condition, results of operations and cash flows.

We may be unable to pursue acquisitions or expand into new geographic regions without obtaining additional capital or consent from our lenders.

We cannot predict the timing, size and success of our acquisition efforts, our efforts to expand into new geographic regions or the associated capital commitments. If we do not have sufficient cash resources or availability under our credit facility, our growth could be limited unless we obtain additional equity or debt financing. In the future, we may elect to issue additional equity securities in conjunction with raising capital, completing an acquisition or expanding into a new geographic region. Such issuances could be dilutive to existing shareholders. In addition, our credit facility prohibits us from consummating any individual acquisition or a series of related acquisitions with total consideration paid or payable in excess of $60.0 million and consummating acquisitions with total consideration paid or payable in excess of $80.0 million in the aggregate in any fiscal year, without the consent of the lenders. Further, our credit facility requires, among other things, that we are in pro forma compliance with the financial covenants set forth therein and that no event of default exists before and after giving effect to any proposed acquisition. Our ability to expand in a manner consistent with historic practices may be limited if we are unable to obtain such consent from our lenders.

As a result of the indemnification provisions of the Home Health Purchase Agreement (defined below) pursuant to which we sold Home Health Business, we may incur expenses and liabilities related to periods up to the date of sale or pursuant to our other indemnification obligations thereunder.

As a result of the indemnification provisions of that certain Asset Purchase Agreement, dated as of February 7, 2013, with LHC (the “Home Health Purchase Agreement”), pursuant to which we sold the Home Health Business, we have agreed to indemnify LHC for, among other things, (i) penalties, fines, judgments and settlement amounts arising from a violation of certain specified statutes, including the False Claims Act, the Civil Monetary Penalties Law, the federal Anti-Kickback Statute, the Stark Law or any state law equivalent in connection with the operation of

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the Home Health Business prior to the consummation of the sale (the “LHC Closing”), and (ii) any liability related to the failure of any reimbursement claim submitted to certain government programs for services rendered by the Home Health Business prior to the LHC Closing to meet the requirements of such government programs, or any violation prior to the Closing of any healthcare laws. Such liabilities include amounts to be recouped by, or repaid to, such government programs as a result of improperly submitted claims for reimbursement or those discovered as a result of audits by investigative agencies. All services that we have provided that have been or may be reimbursed by Medicare are subject to retroactive adjustments and/or total denial of payments received from Medicare under various review and audit provisions included in the program regulations. The review period is generally described as six years from the date the services are provided but could be expanded to ten years under certain circumstances if fraud is found to have existed at the time of original billing. In the event that there are adjustments relating to the period prior to the LHC Closing, we may be required to reimburse LHC for the amount of such adjustments, which could adversely affect our business and financial condition.

In addition, pursuant to the Home Health Purchase Agreement, we are obligated to indemnify LHC for breaches of representations, warranties and covenants, certain taxes and liabilities related to the pre- LHC Closing period (other than specifically identified assumed liabilities). Any liability we have to LHC under the Home Health Purchase Agreement could adversely affect our results of operations.

Federal regulation may impair our ability to consummate acquisitions or open new agencies.

Changes in federal laws or regulations may materially adversely impact our ability to acquire home health agencies or open new start-up home health agencies. For example, a Medicare regulation known as the “36 Month Rule” prohibits buyers of home health agencies from assuming the Medicare billing privileges of the acquired agency if the acquired agency either enrolled in Medicare or underwent a change in majority ownership fewer than 36 months prior to the acquisition, subject to certain exceptions. Instead, the buyer must enroll the acquired home health agencies as new providers with Medicare. The 36 Month Rule can increase competition for acquisition targets that are not subject to the rule and may cause significant Medicare billing delays for the purchases of home health agencies that are subject to the rule.

Our business may be harmed by labor relations matters.

We are subject to a risk of work stoppages and other labor relations matters because our hourly workforce is highly unionized. As of December 31, 2017, approximately 60.4% of our workforce was represented by the Service Employees International Union (the “SEIU”). We have a national relationship with the SEIU, as well as numerous agreements with local SEIU affiliates which are renegotiated from time to time. These negotiations are often initiated when we receive increases in our hourly rates from various state agencies. Upon expiration of these collective bargaining agreements, we may not be able to negotiate labor agreements on satisfactory terms with these labor unions. A strike, work stoppage or other slowdown could result in a disruption of our operations and/or higher ongoing labor costs, which could adversely affect our business. Labor costs are the most significant component of our total expenditures and, therefore, an increase in the cost of labor could significantly harm our business.

Our operations subject us to risk of litigation.

Operating in the personal care services industry exposes us to an inherent risk of wrongful death, personal injury, professional malpractice and other potential claims or litigation brought by our consumers and employees. From time to time, we are subject to claims alleging that we did not properly treat or care for a consumer that we failed to follow internal or external procedures that resulted in death or harm to a consumer or that our employees mistreated our consumers, resulting in death or harm. We are also subject to claims arising out of accidents involving vehicle collisions brought by consumers whom we are transporting, from employees driving to or from home visits or other affected individuals.

In addition, regulatory agencies may initiate administrative proceedings alleging violations of statutes and regulations arising from our services and seek to impose monetary penalties on us. We could be required to pay substantial amounts to respond to regulatory investigations or, if we do not prevail, damages or penalties arising from these legal proceedings. We also are subject to potential lawsuits under the federal False Claims Act or other federal and state whistleblower statutes designed to combat fraud and abuse in our industry. These lawsuits can involve significant monetary awards or penalties which may not be covered by our insurance. If our third-party insurance coverage and self-insurance coverage reserves are not adequate to cover these claims, it could have a material

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adverse effect on our business, results of operations and financial condition. Even if we are successful in our defense, civil lawsuits or regulatory proceedings could distract us from running our business or irreparably damage our reputation.

Our insurance liability coverage may not be sufficient for our business needs.

Although we maintain insurance consistent with industry practice, the insurance we maintain may not be sufficient to satisfy all claims made against us. We cannot assure you that claims will not be made in the future in excess of the limits of our insurance, and any such claims, if successful and in excess of such limits, may have a material adverse effect on our business or assets. We utilize historical data to estimate our reserves for our insurance programs. If losses on asserted claims exceed the current insurance coverage and accrued reserves, our business, results of operations and financial condition could be adversely affected. Changes in our annual insurance costs and self-insured retention limits depend in large part on the insurance market, and insurance coverage may not continue to be available to us at commercially reasonable rates, in adequate amounts or on satisfactory terms.

Inclement weather or natural disasters may impact our ability to provide services.

Inclement weather or natural disasters may prevent our employees from providing authorized services. We are not paid for authorized services that are not delivered due to these weather events. Furthermore, prolonged inclement weather or the occurrence of natural disasters in the markets in which we operate could disrupt our relationships with consumers, employees and referral sources located in affected areas and, in the case of our corporate office, our ability to provide administrative support services, including billing and collection services. For example, one of our support centers and a number of our agencies are located in the Midwestern United States, New York and California, increasing our exposure to blizzards and other major snowstorms, ice storms, tornadoes, flooding and earthquakes. The impact of disasters and similar events is inherently uncertain. Future inclement weather or natural disasters may adversely affect our reputation, business and consolidated financial condition, results of operations and cash flows.

Our business depends on our information systems. Our operations may be disrupted if we are unable to effectively integrate, manage and maintain the security of our information systems.

Our business depends on effective and secure information systems that assist us in, among other things, gathering information to improve the quality of consumer care, optimizing financial performance, adjusting consumer mix, monitoring regulatory compliance and enhancing staff efficiency. We rely on an external service provider, McKesson, to provide continual maintenance, upgrading and enhancement of our primary information systems used for our operational needs. The software we license from McKesson supports intake, personnel scheduling, office clinical and centralized billing and receivables management in an integrated database, enabling us to standardize the care delivered across our network of offices and monitor our performance and consumer outcomes. To the extent that McKesson fails to support the software or systems, or if we lose our license with McKesson, our operations could be negatively affected.

Our business also depends on a comprehensive payroll and human resources system for basic payroll functions and reporting, payroll tax reporting, managing wage assignments and garnishments. We rely on an external service provider, ADP, to provide continual maintenance, upgrading and enhancement of our primary human resource and payroll systems. To the extent that ADP fails to support the software or systems, or any of the related support services provided by them, our internal operations could be negatively affected.

Our business also supports the use of Electronic Visit Verification (“EVV”) to collect visit submission information through our delivery of home care services. Our solution uses a combination of Interactive Voice Response and GPS enabled smartphones to capture time in and time out, mileage and travel time, as well as the completed care plan tasks. We license this software through CellTrak along with partnering with states who utilize Authenticare, SanData, and HealthStar. We rely on these providers to provide continual maintenance, enhancements, as well as security of any protected data. To the extent that our EVV vendors fail to support these processes, our internal operations could be negatively affected.

If we experience a reduction in the performance, reliability, or availability of our information systems, our operations and ability to process transactions and produce timely and accurate reports could be adversely affected. If we experience difficulties with the transition and integration of information systems or are unable to implement,

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maintain, or expand our systems properly, we could suffer from, among other things, operational disruptions, regulatory problems, and increases in administrative expenses.

We have full backup of our key information systems. Should our main datacenter become inoperable because of a natural disaster or terrorist acts, our operations would failover to our geographically separate disaster recovery datacenter with a quick return to operations for all sites and systems. All of our sites and branch offices have redundant connections to our primary and backup datacenters using data lines and cellular connections through VPN or MPLS.

The key business functions for our main sites also have redundancies with key functions geographically split between our two main facilities, should one not be available due to the above mentioned scenarios.

While we believe these measures are reasonable, no system of information security is able to eliminate the risk of business disruptions.

A cyber-attack or security breach could cause a loss of confidential consumer data, give rise to remediation and other expenses, expose us to liability under HIPAA, consumer protection laws, common law or other legal theories, subject us to litigation and federal and state governmental inquiries, damage our reputation, and otherwise be disruptive to our business.

We rely extensively on our computer systems to manage clinical and financial data, to communicate with our consumers, payors, vendors and other third parties, and to summarize and analyze our operating results. In spite of our policies, procedures and other security measures used to protect our computer systems and data, occasionally, we have experienced breaches that require us to notify affected consumers and the government, and we have worked with consumers and the government to resolve such issues. There can be no assurance that we will not be subject to additional and/or more severe cyber-attacks or security breaches in the future. Such attacks or breaches could result in loss of protected patient medical data or other information subject to privacy laws or disrupt our information technology systems or business, potentially exposing us to regulatory action, litigation and liability. We continue to prioritize cyber-security and the development of practices and controls to protect our systems and data. We utilize sophisticated firewalls to mitigate external threats and attacks through daily security content updates and intrusion prevention policies. In addition, all email is scanned for threats and viruses as well as Domain Keys Identified Mail (DKIM) keys authentication and Sender Policy Framework (SPF) records are utilized to mitigate spoofing and phishing attempts. Outgoing email is encrypted based on content and HIPAA regulations. In addition, we are required to comply with the privacy and security laws and regulations of HIPAA as amended by HITECH. If our privacy and security practices are not in compliance with HIPAA and/or if we fail to satisfy applicable breach notification requirements in the event of a security breach, we could be subject to significant fines and penalties. Penalties under HIPAA can be as high as $55,910 per violation (with an annual maximum of $1,677,299 per provision violated) depending on the degree of culpability.

Our current principal stockholders could have significant influence over us, and they could delay, deter or prevent a change of control or other business combination or otherwise cause us to take action with which you might not agree.

Eos Capital Partners III, L.P. and certain of its subsidiaries and affiliates, including ECP Helios Partners III, L.P., ECP General III, L.P., and Eos Partners SBIC III, L.P., together beneficially own approximately 32.1% of our outstanding common stock as of December 31, 2017. Even if all of the shares of common stock offered in this prospectus supplement are sold, the selling stockholder and these affiliates will beneficially own approximately 21.2% of our outstanding common stock (or 20.7% if the underwriters in this offering exercise their option to purchase additional shares in full) and thus will continue to have the ability to significantly influence all matters submitted to our stockholders for approval, including:

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In addition, Mark First, one of our directors, is affiliated with the selling stockholder.

This concentration of ownership of shares of our common stock could delay or prevent proxy contests, mergers, tender offers, open-market purchase programs or other purchases of shares of our common stock that might otherwise give you the opportunity to realize a premium over the then-prevailing market price of our common stock. The interests of the selling stockholder may not always coincide with the interests of the other holders of our common stock. This concentration of ownership may also adversely affect our stock price.

We may not be able to attract and retain qualified personnel or we may incur increased costs in doing so.

We must attract and retain qualified non-executive personnel in the markets in which we operate in order to provide our services. We compete for personnel with other providers of social and medical services as well as companies in other service-based industries. Increased competition for trained personnel or general inflationary pressures may require that we enhance our pay and benefits packages to compete effectively for such personnel. We may not be able to offset such added costs by increasing the rates we charge for our services. An increase in personnel costs could negatively impact our business. In addition, if we fail to attract and retain qualified and skilled personnel, our ability to conduct our business operations effectively would be harmed.

Competition may be greater for managers, such as regional and agency directors. Our ability to attract and retain personnel depends on several factors, including our ability to provide employees with attractive assignments and competitive benefits and salaries. The loss of one or more of the members of the executive management team or the inability of a new management team to successfully execute our strategies may adversely affect our business. If we are unable to attract and retain qualified personnel, we may be unable to provide our services, the quality of our services may decline, and we could lose consumers and referral sources.

We may be more vulnerable to the effects of a public health catastrophe than other businesses due to the nature of our consumers.

The majority of our consumers are older individuals with complex medical challenges, many of whom may be more vulnerable than the general public during a pandemic or in a public health catastrophe. Our employees are also at greater risk of contracting contagious diseases due to their increased exposure to vulnerable consumers. For example, if a flu pandemic were to occur, we could suffer significant losses to our consumer population or a reduction in the availability of our employees and, at a high cost, be required to hire replacements for affected workers. Accordingly, certain public health catastrophes could have a material adverse effect on our financial condition and results of operations.

We depend on the services of our executive team members.

Our success depends upon the continued employment of certain members of our executive team to manage several of our key functional areas, including operations, business development, accounting, finance, human resources, marketing, information systems, contracting and compliance. In 2016 and 2017, we changed a majority of the members of senior management, beginning with our CEO. The departure of any member of our executive team may materially adversely affect our operations.

If we were required to write down all or part of our goodwill and/or our intangible assets, our net earnings and net worth could be materially adversely affected.

Goodwill and intangible assets with finite lives represent a significant portion of our assets. Goodwill represents the excess of cost over the fair market value of net assets acquired in business combinations. For example, if our market capitalization drops significantly below the amount of net equity recorded on our balance sheet, it might indicate a decline in our fair value and would require us to further evaluate whether our goodwill has been impaired. If as part of our annual review of goodwill and intangibles, we were required to write down all or a significant part of our goodwill and/or intangible assets, our net earnings and net worth could be materially adversely affected, which could affect our flexibility to obtain additional financing. In addition, if our assumptions used in preparing our valuations for purposes of impairment testing differ materially from actual future results, we may record impairment charges in the future and our financial results may be materially adversely affected. We had $90.3 million and $72.7 million of goodwill and $16.6 million and $15.3 million of intangible assets recorded on our Consolidated Balance Sheets at December 31, 2017 and 2016, respectively.

It is not possible at this time to determine if there will be any future impairment charge, or if there is, whether such charges would be material. We will continue to review our goodwill and other intangible assets for possible

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impairment. We cannot be certain that a downturn in our business or changes in market conditions will not result in an impairment of goodwill or other intangible assets and the recognition of resulting expenses in future periods, which could adversely affect our results of operations for those periods.

Compliance with changing regulations including specific program compliance, corporate governance and public disclosure will result in additional expenses and pose challenges for our management team.

The state agencies that contract for our services require our compliance with various rules and regulations affecting the services we provide. We have a compliance officer who monitors and reports on our efforts for achieving the desired results. State agencies are recommending increased rules and regulations in an effort to control the growth of these programs and their overall costs. The implementation of these changes may require us to increase our efforts to remain compliant, may reduce the authorizations for services to be provided, and may result in certain consumers no longer being eligible for our services all of which may result in lower revenues and increased costs, reducing our operating performance and profitability. If we continue to serve our consumers without addressing these increased regulations we are at risk for non-compliance with program requirements and potential penalties.

Changing laws, regulations and standards relating to corporate governance and public disclosure, including the Dodd-Frank Wall Street Reform and Consumer Protection Act and the rules and regulations promulgated thereunder, the Sarbanes-Oxley Act and SEC regulations, have created uncertainty for public companies and significantly increased the costs and risks associated with accessing the U.S. public markets. We are committed to maintaining high standards of internal controls over financial reporting, corporate governance and public disclosure. As a result, we intend to continue to invest appropriate resources to comply with evolving standards, and this investment has resulted and will likely continue to result in increased general and administrative expenses and a diversion of management time and attention from revenue-generating activities to compliance activities.

Restrictive covenants in the agreements governing our indebtedness may adversely affect us.

Our credit facility and the indentures governing our outstanding notes contain various covenants that limit our ability to take certain actions, including our ability to:

In addition, our credit facility contains restrictive covenants and requires us to maintain specified financial ratios and satisfy other financial condition tests. Our ability to meet these restrictive covenants and financial ratios and tests may be affected by events beyond our control, and we cannot assure you that we will meet those tests.

A breach of any of these covenants could result in a default under our credit facility and the indentures governing our outstanding notes. Upon the occurrence of an event of default under our credit facility or the indentures governing our outstanding notes, all amounts outstanding under our credit facility and our outstanding notes may become immediately due and payable and all commitments under the credit facility to extend further credit may be terminated. The acceleration of any such indebtedness will result in an event of default under all of our other long-term indebtedness.

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Risks Related to Our Common Stock and This Offering

We have broad discretion in the use of the net proceeds from this offering and our existing cash and may not use them effectively.

Our management will have broad discretion in the application of the net proceeds from this offering, including for any of the purposes described in the section titled “Use of Proceeds,” as well as our existing cash, and you will be relying on the judgment of our management regarding such application. You will not have the opportunity, as part of your investment decision, to assess whether the proceeds are being used appropriately. Our management might not apply the net proceeds or our existing cash in ways that ultimately increase the value of your investment. If we do not invest or apply the net proceeds from this offering or our existing cash in ways that enhance stockholder value, we may fail to achieve expected results, which could cause our stock price to decline. Pending their use, we may invest the net proceeds from this offering in short-term, interest-bearing, investment-grade securities with insignificant rates of return. These investments may not yield a favorable return to our stockholders.

The market price of our common stock may be volatile and this may adversely affect our stockholders.

The price at which our common stock trades may be volatile. The stock market has recently experienced significant price and volume fluctuations that have affected the market prices of all securities, including securities of healthcare companies. The market price of our common stock may be influenced by many factors, including:

In addition, the stock market in general has experienced price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of homecare companies. These broad market and industry factors may materially reduce the market price of our common stock, regardless of our operating performance. In the past, securities class-action litigation has often been brought against companies following periods of volatility in the market price of their respective securities. We have been and may become involved in this type of litigation in the future. Litigation of this type is often expensive to defend and may divert our management team’s attention as well as resources from the operation of our business.

We do not anticipate paying dividends on our common stock in the foreseeable future and, consequently, your ability to achieve a return on your investment will depend solely on appreciation in the price of our common stock.

We have not paid dividends on our shares of common stock and intend to retain all future earnings to finance the continued growth and development of our business and for general corporate purposes. In addition, we do not anticipate paying cash dividends on our common stock in the foreseeable future. Any future payment of cash dividends will depend upon our financial condition, capital requirements, credit facility limitations, earnings and other factors deemed relevant by our board of directors. Our credit facility restricts our ability to declare or pay any upstream dividend or other distribution from our affiliates to the Company unless no default or event of default has occurred and is continuing or would arise as a result thereof and the aggregate amount of dividends and distributions paid in any fiscal year does not exceed $5.0 million per annum.

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If securities or industry analysts fail to publish research or reports about our business or publish negative research or reports, or our results are below analysts’ estimates, our stock price and trading volume could decline.

The trading market for our common stock may depend in part on the research and reports that industry or securities analysts publish about us or our business. We do not have any control over these analysts. If analysts fail to publish reports on us regularly or at all, we could fail to gain visibility in the financial markets, which in turn could cause our stock price or trading volume to decline. If one or more analysts do cover us and downgrade their evaluations of our stock or our results are below analysts’ estimates, our stock price would likely decline. In addition, due to the small number of analysts covering us, a single comment or report from one of the analysts whether positive or negative, could result in a significant increase or decrease in our stock price.

We are able to issue shares of preferred stock with greater rights than our common stock.

Our board of directors is authorized to issue one or more series of preferred stock from time to time without any action on the part of our stockholders. Our board of directors also has the power, without stockholder approval, to set the terms of any such series of preferred stock that may be issued, including voting rights, dividend rights and preferences over our common stock with respect to dividends and other terms. If we issue preferred stock in the future that has a preference over our common stock with respect to the payment of dividends or other terms, or if we issue preferred stock with voting rights that dilute the voting power of our common stock, the rights of holders of our common stock or the market price of our common stock could be adversely affected.

Sales of a substantial number of shares of our common stock or preferred stock in the public market could depress the price of our common stock

As of August 8, 2018, there were 11,697,345 shares of our common stock outstanding, 708,981 shares of common stock issuable upon the exercise of outstanding stock options, and an additional 146,489 shares of our common stock that may be issued in connection with outstanding equity awards held by management, other employees and directors. As of August 8, 2018, 849,739 shares of our common stock were reserved for future awards pursuant to our equity compensation plans without stockholder approval. We also have the authority to issue up to 10,000,000 shares of preferred stock upon terms that are determined by our board of directors. In addition, in 2017, we registered with the SEC the potential issuance of shares of common stock, shares of preferred stock, warrants and units by the Company in an amount up to $150,000,000 on a registration statement on Form S-3 (which amount includes the shares of common stock that may be issued and sold pursuant to this offering). The proceeds to be received from any sale of these securities, if issued, may be used for working capital and general corporate purposes, or used in future acquisitions, subject to the covenants of any existing and future outstanding indebtedness. Sales of a substantial number of these securities in the public market, or factors relating to the terms we may determine for our common stock, preferred stock, debt securities, warrants, units and options, could decrease the market price of our common stock. In addition, the perception that such sales might occur may cause the market price of our common stock to decline. Future issuances or sales of our common stock could have an adverse effect on the market price of our common stock or make it more difficult for you to sell your shares of our common stock at a time and price that you deem appropriate.

In addition, as described under the caption “Underwriting,” our directors and executive officers have agreed, subject to certain exceptions, not to offer, sell or contract to sell, directly or indirectly, any shares of our common stock for a period of 90 days from the date of this prospectus supplement. Sales of a substantial number of such shares upon expiration of such period, or the perception that such sales might occur, could have an adverse effect on the market price of our common stock or make it more difficult for you to sell your shares of our common stock at a time and price that you deem appropriate.

Your percentage of ownership in us may be diluted in the future.

As with any publicly traded company, your percentage ownership in us may be diluted in the future because of equity issuances for acquisitions, capital market transactions or otherwise, including equity awards that we expect will be granted to our directors, officers and employees.

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Provisions in our organizational documents and Delaware or certain other state laws could delay or prevent a change in control of our company, which could adversely affect the price of our common stock.

Provisions in our amended and restated certificate of incorporation and bylaws and anti-takeover provisions of the Delaware General Corporation Law, could discourage, delay or prevent an unsolicited change in control of our company, which could adversely affect the price of our common stock. These provisions may also have the effect of making it more difficult for third parties to replace our current management without the consent of the board of directors. Provisions in our amended and restated certificate of incorporation and bylaws that could delay or prevent an unsolicited change in control include:

As a Delaware corporation, we are subject to Section 203 of the Delaware General Corporation Law. This section generally prohibits us from engaging in mergers and other business combinations with stockholders that beneficially own 15% or more of our voting stock, or with their affiliates, unless our directors or stockholders approve the business combination in the prescribed manner. However, because the selling stockholder acquired its shares prior to our IPO, Section 203 is currently inapplicable to any business combination with the selling stockholder or its affiliates. In addition, our amended and restated bylaws require that any stockholder proposals or nominations for election to our board of directors must meet specific advance notice requirements and procedures, which make it more difficult for our stockholders to make proposals or director nominations. Certain states in which we operate, such as New York, may require regulatory approval of persons meeting such states’ definition of “controlling persons” or similar concepts, which could delay or deter a change of control or other business combination with us.

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USE OF PROCEEDS

We estimate that the net proceeds from the assumed sale of the 1,075,267 shares of common stock that we are offering will be approximately $         million (or approximately $         million if the underwriters exercise their option to purchase additional shares in full), after deducting the underwriting discounts and commissions and estimated offering expenses payable by us.

We intend to use the net proceeds we receive from this offering for general corporate purposes, including to potentially fund a portion of any future acquisitions that we may complete. We currently anticipate that acquisitions we have identified could result in the use of substantially all of these proceeds in the next 6 to 12 months.

As of the date of this prospectus supplement, we cannot specify with certainty all of the particular uses for the net proceeds to us from this offering. Accordingly, our management will have broad discretion in the application of these proceeds. Pending the use of the net proceeds, we intend to invest the net proceeds in short-term, interest-bearing, investment-grade securities.

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MARKET PRICE OF COMMON STOCK

Our common stock is traded on The Nasdaq Global Select Market under the symbol “ADUS.” The following table sets forth for the periods indicated the high and low intra-day sale prices per share of our common stock as reported on Nasdaq:

On August 10, 2018, the last reported sale price of our common stock on Nasdaq was $64.15 per share. As of August 8, 2018, we had 55 holders of record of our common stock. The actual number of holders of common stock is greater than this number of record holders and includes stockholders who are beneficial owners, but whose shares are held in street name by brokers and nominees. The number of holders of record also does not include stockholders whose shares may be held in trust by other entities.

DIVIDEND POLICY

We do not currently pay and do not currently anticipate paying dividends on our common stock following this offering. Any declaration and payment of future dividends to holders of our common stock may be limited by restrictive covenants in our debt agreements, will be at the sole discretion of our board of directors and will depend on many factors, including our financial condition, earnings, capital requirements, level of indebtedness, statutory and contractual restrictions applying to the payment of dividends and other considerations that our board of directors deems relevant.

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SELLING STOCKHOLDER

The following table sets forth information with respect to the current beneficial ownership of the selling stockholder, the number of shares of common stock being offered by the selling stockholder hereby and information with respect to shares to be beneficially owned by the selling stockholder after completion of this offering.

The number of shares and percentages of beneficial ownership set forth below are based on 11,697,345 shares of our common stock issued and outstanding as of August 8, 2018 and 12,772,612 shares issued and outstanding upon consummation of this offering. Beneficial ownership is determined under the SEC rules and regulations and generally includes voting or investment power over securities. Except as indicated in the footnotes to this table, we believe that the selling stockholder identified in the table possesses sole voting and investment power over all shares of equity securities shown as beneficially owned by the selling stockholder.

The information in the table below with respect to the selling stockholder has been obtained from the selling stockholder. When we refer to the “selling stockholder” in this prospectus supplement, we mean the selling stockholder listed in the table below, as well as its respective pledgees, donees, assignees, transferees and successors and others who may hold any of the selling stockholder’s interest.

Relationship between the Selling Stockholder and Us

On September 19, 2006, we entered into a Registration Rights Agreement to which the selling stockholder was a party (the “Registration Rights Agreement”). Pursuant to the terms of the Registration Rights Agreement, the selling stockholder was granted certain registration rights to register the restricted shares of common stock held by the selling stockholder, including the shares listed in the table above. We have also agreed to pay the legal fees and expenses of counsel to the selling stockholder in connection with this offering in accordance with the Registration Rights Agreement. Additionally, Mr. First, a member of our board of directors, is affiliated with the selling stockholder; however, we consider Mr. First an independent director under Nasdaq rules. See the section of our Definitive Proxy Statement on Schedule 14A, filed with the SEC on April 30, 2018, titled “Corporate Governance—Director Independence.”

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MATERIAL UNITED STATES FEDERAL INCOME AND ESTATE

TAX CONSEQUENCES TO NON-U.S. HOLDERS

The following discussion is a summary of material United States federal income and estate tax consequences to a non-U.S. holder (as defined below) of the purchase, ownership and disposition of our common stock purchased in this offering, but does not purport to be a complete analysis of all potential tax effects. This summary is based upon provisions of the Code and United States Treasury regulations, judicial decisions, and published rulings and administrative pronouncements of the U.S. Internal Revenue Service (the “IRS”), in each case in effect as of the date hereof. Those authorities may be changed or be subject to differing interpretations, perhaps retroactively, so as to result in United States federal income and estate tax consequences different from those summarized below and which may adversely affect a non-U.S. holder of our common stock. We have not sought and will not seek any rulings from the IRS regarding the matters discussed below. There can be no assurance the IRS or a court will not take a contrary position to that discussed below regarding the tax consequences of the purchase, ownership and disposition of our common stock.

Except where noted, this discussion deals only with common stock that is held as a capital asset within the meaning of Section 1221 of the Internal Revenue Code of 1986, as amended, or the Code. This summary does not address all aspects of United States federal income and estate taxes and does not deal with foreign, state, local or other tax considerations that may be relevant to you in light of your particular circumstances. In addition, it does not address consequences relevant to Non-U.S. Holders subject to special rules, including, without limitation:

If an entity treated as a partnership for United States federal income tax purposes holds our common stock, the tax treatment of a partner will generally depend upon the status of the partner and the activities of the partnership. If you are a partner of a partnership holding our common stock, you should consult your own tax advisors.

This discussion is not tax advice. If you are considering the purchase of our common stock, you should consult your own tax advisors concerning the particular United States federal income and estate tax consequences to you of the purchase, ownership and disposition of the common stock, as well as the consequences to you arising under the laws of any other taxing jurisdiction.

Definition of Non-U.S. Holder

A “non-U.S. holder” means any beneficial owner of our common stock (other than an entity treated as a partnership for United States federal income tax purposes) that is not for United States federal income tax purposes any of the following:

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A modified definition of “non-U.S. holder” applies for United States federal estate tax purposes (as discussed below).

Distributions

In the event that we make a distribution of cash or other property (other than certain pro rata distributions of our stock) in respect of our common stock, the distribution generally will constitute a dividend for United States federal income tax purposes to the extent it is paid from our current or accumulated earnings and profits, as determined under United States federal income tax principles. Any portion of a distribution that exceeds our current and accumulated earnings and profits generally will be treated as a return of capital and first be applied against and reduce the adjusted tax basis of your common stock (but not below zero). Any excess will be treated as gain from the disposition of our common stock (the tax treatment of which is discussed below under “—Gain on Disposition of Common Stock”).

Dividends paid to you generally will be subject to withholding of United States federal income tax at a 30% rate or such lower rate as may be specified by an applicable income tax treaty. However, dividends that are effectively connected with the conduct of a trade or business within the United States (and, if required by an applicable income tax treaty, are attributable to a United States permanent establishment) are not subject to the withholding tax, provided that you must provide a properly executed Internal Revenue Service Form W-8ECI (or other applicable form) in accordance with the applicable certification requirements in order to establish an exemption from this withholding. Instead, such dividends are subject to United States federal income tax on a net-income basis generally in the same manner as if you were a United States person as defined under the Code. Any such effectively connected dividends received by a foreign corporation may be subject to an additional “branch profits tax” at a 30% rate or such lower rate as may be specified by an applicable income tax treaty.

If you wish to claim the benefit of an applicable treaty rate and avoid backup withholding, as discussed below, for dividends, you will be required (a) to provide the applicable withholding agent with a properly executed Internal Revenue Service Form W-8BEN or Form W-8BEN-E (or other applicable form) certifying under penalty of perjury that you are not a United States person as defined under the Code and are eligible for treaty benefits or (b) if our common stock is held through certain foreign intermediaries, to satisfy the relevant certification requirements of applicable United States Treasury regulations. Special certification and other requirements apply to certain non-U.S. holders that are pass-through entities rather than corporations or individuals.

If you are eligible for a reduced rate of United States withholding tax pursuant to an income tax treaty but fail to timely furnish the required documentation, you may obtain a refund of any excess amounts withheld by timely filing an appropriate claim for refund with the Internal Revenue Service.

Sale or Other Taxable Disposition of Common Stock

Subject to the discussion of backup withholding and FATCA below, any gain realized by you on the taxable disposition of our common stock generally will not be subject to United States federal income tax unless:

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A non-U.S. holder described in the first bullet point immediately above generally will be subject to tax on the net gain derived from the disposition in the same manner as if the non-U.S. holder were a United States person as defined under the Code. In addition, if any non-U.S. holder described in the first bullet point immediately above is a foreign corporation, the gain realized by such non-U.S. holder may be subject to an additional “branch profits tax” at a 30% rate or such lower rate as may be specified by an applicable income tax treaty. An individual non-U.S. holder described in the second bullet point immediately above generally will be subject to a flat 30% (or such lower rate as may be specified by an applicable income tax treaty) tax on the gain derived from the disposition, which gain may be offset by United States-source capital losses, even though the individual is not considered a resident of the United States.

Although there can be no assurance, we believe we are not and do not anticipate becoming a “United States real property holding corporation” for United States federal income tax purposes.

Non-U.S. Holders should consult their tax advisors regarding potentially applicable income tax treaties that may provide for different rules.

Federal Estate Tax

Our common stock that is owned (or treated as owned) by an individual who is not a citizen or resident of the United States (as specially defined for United States federal estate tax purposes) at the time of death will be included in his or her gross estate for United States federal estate tax purposes, unless an applicable estate tax treaty provides otherwise, and, therefore, may be subject to United States federal estate tax.

Information Reporting and Backup Withholding

Distributions paid to you and the amount of tax withheld, if any, with respect to such distributions generally will be reported to the Internal Revenue Service. Copies of the information returns reporting such dividends and any withholding may also be made available to the tax authorities in the country in which you reside under the provisions of an applicable income tax treaty or exchange of information agreement.

You may be subject to backup withholding on dividends paid to you unless you certify, on an applicable Internal Revenue Service Form W-8, under penalty of perjury that you are a non-U.S. person, or otherwise establish an exemption.

Information reporting and, depending on the circumstances, backup withholding generally will apply to the proceeds of a sale or other disposition of our common stock within the United States or conducted through certain United States-related financial intermediaries, unless you certify, on an applicable Internal Revenue Service Form W-8, under penalty of perjury that you are a non-U.S. person, or otherwise establish an exemption.

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules may be allowed as a refund or a credit against a non-U.S. holder’s United States federal income tax liability provided the required information is timely furnished to the Internal Revenue Service.

Additional Withholding Requirements

Under Sections 1471 through 1474 of the Code (commonly referred to as “FATCA”), a 30% United States federal withholding tax may apply to any dividends paid on our common stock, and, for a disposition of our common stock occurring after December 31, 2018, the gross proceeds from such disposition, in each case paid to (i) a “foreign financial institution” (as defined by the Code to include, in addition to banks and traditional financial institutions, entities such as investment funds and certain holding companies) which does not provide sufficient documentation, typically on Internal Revenue Service Form W-8BEN-E, evidencing either (x) an exemption from FATCA, or (y) its compliance (or deemed compliance) with FATCA (which may alternatively be in the form of compliance with an intergovernmental agreement with the United States) in a manner that avoids withholding, or (ii) a “non-financial foreign entity” (as specifically defined in the Code) which does not provide sufficient documentation, typically on Internal Revenue Service Form W-8BEN-E, evidencing either (x) an exemption from FATCA, or (y) adequate information regarding certain substantial United States beneficial owners of such entity (if any). Accordingly, entities through which our common stock is held may affect the determination of whether such withholding is required. If a

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dividend payment is both subject to withholding under FATCA and subject to the withholding tax discussed above under “—Dividends,” the withholding under FATCA may be credited against, and therefore reduce, such other withholding tax. The FATCA withholding tax will apply to all withholdable payments, however, without regard to whether the beneficial owner of the payment would otherwise be entitled to an exemption from imposition of withholding tax pursuant to an applicable tax treaty with the United States or U.S. domestic law. You should consult your own tax advisors regarding these requirements and whether they may be relevant to your ownership and disposition of our common stock.

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UNDERWRITING

Subject to the terms and conditions set forth in the underwriting agreement, dated                , 2018, among us, the selling stockholder and Jefferies LLC, RBC Capital Markets, LLC and Raymond James & Associates, Inc., as the representatives of the underwriters named below and the joint book-running managers of this offering, we and the selling stockholder have agreed to sell to the underwriters, and each of the underwriters has agreed, severally and not jointly, to purchase from us and the selling stockholder, the respective number of shares of common stock shown opposite its name below:

The underwriting agreement provides that the obligations of the several underwriters are subject to certain conditions precedent such as the receipt by the underwriters of officers’ certificates and legal opinions and approval of certain legal matters by their counsel. The underwriting agreement provides that the underwriters will purchase all of the shares of common stock if any of them are purchased. If an underwriter defaults, the underwriting agreement provides that the purchase commitments of the nondefaulting underwriters may be increased or the underwriting agreement may be terminated. We and the selling stockholder have agreed to indemnify the underwriters and certain of their controlling persons against certain liabilities, including liabilities under the Securities Act, and to contribute to payments that the underwriters may be required to make in respect of those liabilities.

The underwriters have advised us that, following the completion of this offering, they currently intend to make a market in the common stock as permitted by applicable laws and regulations. However, the underwriters are not obligated to do so, and the underwriters may discontinue any market-making activities at any time without notice in their sole discretion. Accordingly, no assurance can be given as to the liquidity of the trading market for the common stock, that you will be able to sell any of the common stock held by you at a particular time or that the prices that you receive when you sell will be favorable.

The underwriters are offering the shares of common stock subject to their acceptance of the shares of common stock from us and the selling stockholder and subject to prior sale. The underwriters reserve the right to withdraw, cancel or modify offers to the public and to reject orders in whole or in part.

Commission and Expenses

The underwriters have advised us that they propose to offer the shares of common stock to the public at the initial public offering price set forth on the cover page of this prospectus and to certain dealers, which may include the underwriters, at that price less a concession not in excess of $         per share of common stock. The underwriters may allow, and certain dealers may reallow, a discount from the concession not in excess of $         per share of common stock to certain brokers and dealers. After the offering, the initial public offering price, concession and reallowance to dealers may be reduced by the representatives. No such reduction will change the amount of proceeds to be received by us as set forth on the cover page of this prospectus.

The following table shows the public offering price, the underwriting discounts and commissions that we and the selling stockholder are to pay the underwriters and the proceeds, before expenses, to us and the selling

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stockholder in connection with this offering. Such amounts are shown assuming both no exercise and full exercise of the underwriters’ option to purchase additional shares from us.

We estimate expenses payable by us in connection with this offering, including reimbursement of expenses to the selling stockholder, other than the underwriting discounts and commissions referred to above, will be approximately $        . We have also agreed to reimburse the underwriters for certain of their expenses in an amount up to $25,000.

Listing

Our common stock is listed on Nasdaq under the trading symbol “ADUS”.

Stamp Taxes

If you purchase shares of common stock offered in this prospectus, you may be required to pay stamp taxes and other charges under the laws and practices of the country of purchase, in addition to the offering price listed on the cover page of this prospectus.

Option to Purchase Additional Shares

We have granted to the underwriters an option, exercisable for 30 days from the date of this prospectus, to purchase, from time to time, in whole or in part, up to an aggregate of 315,000 shares from us at the public offering price set forth on the cover page of this prospectus, less underwriting discounts and commissions. If the underwriters exercise this option, each underwriter will be obligated, subject to specified conditions, to purchase a number of additional shares proportionate to that underwriter’s initial purchase commitment as indicated in the table above. This option may be exercised only if the underwriters sell more shares than the total number set forth on the cover page of this prospectus.

No Sales of Similar Securities

We, our executive officers, directors and the selling stockholder and its affiliates that directly own our common stock have agreed, subject to specified exceptions, not to directly or indirectly:

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This restriction terminates after the close of trading of the common stock on and including the 90th day after the date of this prospectus.

Jefferies LLC, together with either RBC Capital Markets, LLC, or Raymond James & Associates, Inc., may, in their sole discretion and at any time or from time to time before the termination of the 90-day period release all or any portion of the securities subject to lock-up agreements. There are no existing agreements between the underwriters and any of our shareholders who will execute a lock-up agreement, providing consent to the sale of shares prior to the expiration of the lock-up period.

Stabilization

The underwriters have advised us that they, pursuant to Regulation M under the Securities Exchange Act of 1934, as amended, certain persons participating in the offering may engage in short sale transactions, stabilizing transactions, syndicate covering transactions or the imposition of penalty bids in connection with this offering. These activities may have the effect of stabilizing or maintaining the market price of the common stock at a level above that which might otherwise prevail in the open market. Establishing short sales positions may involve either “covered” short sales or “naked” short sales.

“Covered” short sales are sales made in an amount not greater than the underwriters’ option to purchase additional shares of our common stock in this offering. The underwriters may close out any covered short position by either exercising their option to purchase additional shares of our common stock or purchasing shares of our common stock in the open market. In determining the source of shares to close out the covered short position, the underwriters will consider, among other things, the price of shares available for purchase in the open market as compared to the price at which they may purchase shares through the option to purchase additional shares.

“Naked” short sales are sales in excess of the option to purchase additional shares of our common stock. The underwriters must close out any naked short position by purchasing shares in the open market. A naked short position is more likely to be created if the underwriters are concerned that there may be downward pressure on the price of the shares of our common stock in the open market after pricing that could adversely affect investors who purchase in this offering.

A stabilizing bid is a bid for the purchase of shares of common stock on behalf of the underwriters for the purpose of fixing or maintaining the price of the common stock. A syndicate covering transaction is the bid for or the purchase of shares of common stock on behalf of the underwriters to reduce a short position incurred by the underwriters in connection with the offering. Similar to other purchase transactions, the underwriter’s purchases to cover the syndicate short sales may have the effect of raising or maintaining the market price of our common stock or preventing or retarding a decline in the market price of our common stock. As a result, the price of our common stock may be higher than the price that might otherwise exist in the open market. A penalty bid is an arrangement permitting the underwriters to reclaim the selling concession otherwise accruing to a syndicate member in connection with the offering if the common stock originally sold by such syndicate member are purchased in a syndicate covering transaction and therefore have not been effectively placed by such syndicate member.

None of we, the selling stockholder or any of the underwriters make any representation or prediction as to the direction or magnitude of any effect that the transactions described above may have on the price of our common stock. The underwriters are not obligated to engage in these activities and, if commenced, any of the activities may be discontinued at any time.

The underwriters may also engage in passive market making transactions in our common stock on the Nasdaq Global Select Market in accordance with Rule 103 of Regulation M during a period before the commencement of offers or sales of shares of our common stock in this offering and extending through the completion of distribution. A passive market maker must display its bid at a price not in excess of the highest independent bid of that security. However, if all independent bids are lowered below the passive market maker’s bid, that bid must then be lowered when specified purchase limits are exceeded.

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Electronic Distribution

A prospectus in electronic format may be made available by e-mail or on the web sites or through online services maintained by one or more of the underwriters or their affiliates. In those cases, prospective investors may view offering terms online and may be allowed to place orders online. The underwriters may agree with us to allocate a specific number of shares of common stock for sale to online brokerage account holders. Any such allocation for online distributions will be made by the underwriters on the same basis as other allocations. Other than the prospectus in electronic format, the information on the underwriters’ web sites and any information contained in any other web site maintained by any of the underwriters is not part of this prospectus, has not been approved and/or endorsed by us or the underwriters and should not be relied upon by investors.

Other Activities and Relationships

The underwriters and certain of their affiliates are full service financial institutions engaged in various activities, which may include securities trading, commercial and investment banking, financial advisory, investment management, investment research, principal investment, hedging, financing and brokerage activities. The underwriters and certain of their affiliates have, from time to time, performed, and may in the future perform, various commercial and investment banking and financial advisory services for us and our affiliates, for which they received or will receive customary fees and expenses.

In the ordinary course of their various business activities, the underwriters and certain of their affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers, and such investment and securities activities may involve securities and/or instruments issued by us and our affiliates. If the underwriters or their respective affiliates have a lending relationship with us, they routinely hedge their credit exposure to us consistent with their customary risk management policies. The underwriters and their respective affiliates may hedge such exposure by entering into transactions which consist of either the purchase of credit default swaps or the creation of short positions in our securities or the securities of our affiliates, including potentially the common stock offered hereby. Any such short positions could adversely affect future trading prices of the common stock offered hereby. The underwriters and certain of their respective affiliates may also communicate independent investment recommendations, market color or trading ideas and/or publish or express independent research views in respect of such securities or instruments and may at any time hold, or recommend to clients that they acquire, long and/or short positions in such securities and instruments.

Disclaimers About Non-U.S. Jurisdictions

European Economic Area

In relation to each member state of the European Economic Area, no offer of shares which are the subject of the offering has been, or will be made to the public in that Member State, other than under the following exemptions under the Prospectus Directive:

provided that no such offer of shares referred to in (a) to (c) above shall result in a requirement for the Corporation or any representative to publish a prospectus pursuant to Article 3 of the Prospectus Directive, or supplement a prospectus pursuant to Article 16 of the Prospectus Directive.

Each person located in a Member State to whom any offer of ordinary shares is made or who receives any communication in respect of an offer of the shares, or who initially acquires any shares will be deemed to have represented, warranted, acknowledged and agreed to and with each representative and the Corporation that (1) it is a “qualified investor” within the meaning of the law in that Member State implementing Article 2(1)(e) of the Prospectus Directive; and (2) in the case of any shares acquired by it as a financial intermediary as that term is used in Article 3(2) of the Prospectus Directive, the shares acquired by it in the offer have not been acquired on behalf of,

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nor have they been acquired with a view to their offer or resale to, persons in any Member State other than qualified investors, as that term is defined in the Prospectus Directive, or in circumstances in which the prior consent of the representative has been given to the offer or resale; or where the shares have been acquired by it on behalf of persons in any Member State other than qualified investors, the offer of those ordinary shares to it is not treated under the Prospectus Directive as having been made to such persons.

The Corporation, the underwriter and its respective affiliates will rely upon the truth and accuracy of the foregoing representations, acknowledgments and agreements.

This prospectus has been prepared on the basis that any offer of shares in any Member State will be made pursuant to an exemption under the Prospectus Directive from the requirement to publish a prospectus for offers of shares. Accordingly any person making or intending to make an offer in that Member State of shares which are the subject of the offering contemplated in this prospectus may only do so in circumstances in which no obligation arises for the Corporation or any of the representative to publish a prospectus pursuant to Article 3 of the Prospectus Directive in relation to such offer. Neither the Corporation nor the representative have authorized, nor do they authorize, the making of any offer of shares in circumstances in which an obligation arises for the Corporation or the representative to publish a prospectus for such offer.

For the purposes of this provision, the expression an “offer of the shares to the public” in relation to any shares in any Member State means the communication in any form and by any means of sufficient information on the terms of the offer and the shares to be offered so as to enable an investor to decide to purchase or subscribe the shares, as the same may be varied in that Member State by any measure implementing the Prospectus Directive in that Member State, the expression “Prospectus Directive” means Directive 2003/71/EC (as amended) and includes any relevant implementing measure in each Member State.

The above selling restriction is in addition to any other selling restrictions set out below.

United Kingdom

This prospectus and any other material in relation to the shares described herein is only being distributed to, and is only directed at, persons in the United Kingdom who are “qualified investors” or otherwise in circumstances which do not require publication by the Corporation of a prospectus pursuant to section 85(1) of the UK Financial Services and Markets Act 2000.

Any investment or investment activity to which this prospectus relates is available only to, and will be engaged in only with, investment professionals falling within Article 19(5), or high net worth entities falling within Article 49(2), of the UK Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 or other persons to whom such investment or investment activity may lawfully be made available (together, “relevant persons”). Persons who are not relevant persons should not take any action on the basis of this prospectus and should not act or rely on it.

Hong Kong

WARNING: The contents of this prospectus supplement have not been reviewed by any regulatory authority in Hong Kong. You are advised to exercise caution in relation to any offer of the shares. If recipients are in any doubt about any of the contents of this prospectus supplement, they should obtain independent professional advice.

The shares may not be offered or sold by means of any document other than (1) in circumstances which do not constitute an offer to the public within the meaning of the Companies Ordinance (Cap.32, Laws of Hong Kong), or (2) to “professional investors” within the meaning of the Securities and Futures Ordinance (Cap.571, Laws of Hong Kong) and any rules made thereunder, or (iii) in other circumstances which do not result in the document being a “prospectus” within the meaning of the Companies Ordinance (Cap.32, Laws of Hong Kong), and no advertisement, invitation or document relating to the shares may be issued or may be in the possession of any person for the purpose of issue (in each case whether in Hong Kong or elsewhere), which is directed at, or the contents of which are likely to be accessed or read by, the public in Hong Kong (except if permitted to do so under the laws of Hong Kong) other than with respect to shares which are or are intended to be disposed of only to persons outside Hong Kong or only to “professional investors” within the meaning of the Securities and Futures Ordinance (Cap. 571, Laws of Hong Kong) and any rules made thereunder.

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Singapore

This prospectus supplement has not been registered as a prospectus with the Monetary Authority of Singapore. Accordingly, this prospectus supplement and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the shares may not be circulated or distributed, nor may the shares be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Singapore other than (1) to an institutional investor under Section 274 of the Securities and Futures Act, Chapter 289 of Singapore (the “SFA”), (2) to a relevant person, or any person pursuant to Section 275(1A), and in accordance with the conditions, specified in Section 275 of the SFA or (3) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

Where the shares are subscribed or purchased under Section 275 by a relevant person which is: (a) a corporation (which is not an accredited investor) the sole business of which is to hold investments and the entire share capital of which is owned by one or more individuals, each of whom is an accredited investor; or (b) a trust (where the trustee is not an accredited investor) whose sole purpose is to hold investments and each beneficiary is an accredited investor, shares, debentures and units of shares and debentures of that corporation or the beneficiaries’ rights and interest in that trust shall not be transferable for 6 months after that corporation or that trust has acquired the shares under Section 275 except: (1) to an institutional investor under Section 274 of the SFA or to a relevant person, or any person pursuant to Section 275(1A), and in accordance with the conditions, specified in Section 275 of the SFA; (2) where no consideration is given for the transfer; or (3) by operation of law.

Japan

The shares have not been and will not be registered under the Financial Instruments and Exchange Law of Japan (Law No. 25 of 1948, as amended) and the underwriter has agreed that it will not offer or sell any shares, directly or indirectly, in Japan or to, or for the benefit of, any resident of Japan (which term as used herein means any person resident in Japan, including any corporation or other entity organized under the laws of Japan), or to others for re-offering or resale, directly or indirectly, in Japan or to a resident of Japan, except pursuant to an exemption from the registration requirements of, and otherwise in compliance with, the Financial Instruments and Exchange Law and any other applicable laws, regulations and ministerial guidelines of Japan.

Switzerland

The shares may not be publicly offered in Switzerland and will not be listed on the SIX Swiss Exchange (“SIX”) or on any other stock exchange or regulated trading facility in Switzerland. This prospectus supplement has been prepared without regard to the disclosure standards for issuance prospectuses under art. 652a or art. 1156 of the Swiss Code of Obligations or the disclosure standards for listing prospectuses under art. 27 ff. of the SIX Listing Rules or the listing rules of any other stock exchange or regulated trading facility in Switzerland. Neither this prospectus supplement nor any other offering or marketing material relating to the shares or the offering may be publicly distributed or otherwise made publicly available in Switzerland.

Neither this prospectus supplement nor any other offering or marketing material relating to the offering, the Corporation, the shares have been or will be filed with or approved by any Swiss regulatory authority. In particular, this document will not be filed with, and the offer of shares will not be supervised by, the Swiss Financial Market Supervisory Authority FINMA (“FINMA”), and the offer of shares has not been and will not be authorized under the Swiss Federal Act on Collective Investment Schemes (“CISA”). The investor protection afforded to acquirers of interests in collective investment schemes under the CISA does not extend to acquirers of shares.

Dubai International Financial Centre

This prospectus supplement relates to an Exempt Offer in accordance with the Offered Securities Rules of the Dubai Financial Services Authority (“DFSA”). This prospectus supplement is intended for distribution only to persons of a type specified in the Offered Securities Rules of the DFSA. It must not be delivered to, or relied on by, any other person. The DFSA has no responsibility for reviewing or verifying any documents in connection with Exempt Offers. The DFSA has not approved this prospectus supplement nor taken steps to verify the information set forth herein and has no responsibility for the prospectus. The shares to which this prospectus supplement relates may be illiquid and/or subject to restrictions on their resale. Prospective purchasers of the shares offered should conduct their own due diligence on the shares. If you do not understand the contents of this prospectus supplement you should consult an authorized financial advisor.

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Australia

No placement document, prospectus, product disclosure statement or other disclosure document has been lodged with the Australian Securities and Investments Commission (“ASIC”), in relation to the offering. This prospectus supplement does not constitute a prospectus, product disclosure statement or other disclosure document under the Corporations Act 2001 (the “Corporations Act”), and does not purport to include the information required for a prospectus, product disclosure statement or other disclosure document under the Corporations Act.

Any offer in Australia of the shares may only be made to persons (the “Exempt Investors”) who are “sophisticated investors” (within the meaning of section 708(8) of the Corporations Act), “professional investors” (within the meaning of section 708(11) of the Corporations Act) or otherwise pursuant to one or more exemptions contained in section 708 of the Corporations Act so that it is lawful to offer the shares without disclosure to investors under Chapter 6D of the Corporations Act.

The shares applied for by Exempt Investors in Australia must not be offered for sale in Australia in the period of 12 months after the date of allotment under the offering, except in circumstances where disclosure to investors under Chapter 6D of the Corporations Act would not be required pursuant to an exemption under section 708 of the Corporations Act or otherwise or where the offer is pursuant to a disclosure document which complies with Chapter 6D of the Corporations Act. Any person acquiring shares must observe such Australian on-sale restrictions.

This prospectus supplement contains general information only and does not take account of the investment objectives, financial situation or particular needs of any particular person. It does not contain any securities recommendations or financial product advice. Before making an investment decision, investors need to consider whether the information in this prospectus supplement is appropriate to their needs, objectives and circumstances, and, if necessary, seek expert advice on those matters.

Notice to Prospective Investors in France

Neither this prospectus supplement nor any other offering material relating to the shares described in this prospectus supplement has been and will not be submitted to the clearance procedures of the Autorité des Marchés Financiers or of the competent authority of another member state of the European Economic Area and notified to the Autorité des Marchés Financiers. The shares have not been offered or sold and will not be offered or sold, directly or indirectly, to the public in France. Neither this prospectus supplement nor any other offering material relating to the shares has been or will be:

Such offers, sales and distributions will be made in France only:

The shares may not be distributed directly or indirectly to the public except in accordance with Articles L.411-1, L.411-2, L.412-1 and L.621-8 through L.621-8-3 of the French Code monétaire et financier and applicable regulations thereunder.

Notice to Prospective Investors in Canada

Resale Restrictions

The distribution of shares in Canada is being made only in the provinces of Ontario, Quebec, Alberta and British Columbia on a private placement basis exempt from the requirement that we prepare and file a prospectus with the securities regulatory authorities in each province where trades of these securities are made. Any resale of the the

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shares in Canada must be made under applicable securities laws which may vary depending on the relevant jurisdiction, and which may require resales to be made under available statutory exemptions or under a discretionary exemption granted by the applicable Canadian securities regulatory authority. Purchasers are advised to seek legal advice prior to any resale of the securities.

Representations of Canadian Purchasers

By purchasing the shares in Canada and accepting delivery of a purchase confirmation, a purchaser is representing to us, the selling stockholder and the dealer from whom the purchase confirmation is received that:

Conflicts of Interest

Canadian purchasers are hereby notified that the underwriters are relying on the exemption set out in section 3A.3 or 3A.4, if applicable, of National Instrument 33-105—Underwriting Conflicts from having to provide certain conflict of interest disclosure in this document.

Statutory Rights of Action

Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if the offering memorandum (including any amendment thereto) such as this document contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the time limit prescribed by the securities legislation of the purchaser’s province or territory. The purchaser of these securities in Canada should refer to any applicable provisions of the securities legislation of the purchaser’s province or territory for particulars of these rights or consult with a legal advisor.

Enforcement of Legal Rights

All of our directors and officers as well as the experts named herein and the selling stockholder may be located outside of Canada and, as a result, it may not be possible for Canadian purchasers to effect service of process within Canada upon us or those persons. All or a substantial portion of our assets and the assets of those persons may be located outside of Canada and, as a result, it may not be possible to satisfy a judgment against us or those persons in Canada or to enforce a judgment obtained in Canadian courts against us or those persons outside of Canada.

Taxation and Eligibility for Investment

Canadian purchasers of the shares should consult their own legal and tax advisors with respect to the tax consequences of an investment in the shares in their particular circumstances and about the eligibility of the shares for investment by the purchaser under relevant Canadian legislation.

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LEGAL MATTERS

Bass, Berry & Sims PLC, Nashville, Tennessee, will issue an opinion with respect to the validity of the issuance of the securities being offered hereby. Certain legal matters in connection with this offering will be passed upon for the underwriters by Latham and Watkins LLP, New York, New York.

EXPERTS

The consolidated financial statements of Addus HomeCare Corporation at December 31, 2017 and for the year then ended incorporated by reference in Addus HomeCare Corporation’s Annual Report (Form 10-K) for the year ended December 31, 2017, including schedules as of December 31, 2017 and for the year then ended appearing therein, and the effectiveness of Addus HomeCare Corporation’s internal control over financial reporting as of December 31, 2017 have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their report thereon, included therein, and incorporated herein by reference. Such consolidated financial statements are incorporated herein by reference in reliance upon such reports given on the authority of such firm as experts in accounting and auditing.

The financial statements as of December 31, 2016 and for the two years then ended incorporated in this prospectus supplement by reference to the Annual Report on Form 10-K of Addus HomeCare Corporation for the year ended December 31, 2017 have been so incorporated in reliance on the report of BDO USA, LLP, an independent registered public accounting firm, incorporated herein by reference, given on the authority of said firm as experts in auditing and accounting.

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to incorporate by reference much of the information we file with the SEC, which means that we can disclose important information to you by referring you to those publicly available documents. The information that we incorporate by reference in this prospectus supplement is considered to be part of this prospectus. Because we are incorporating by reference future filings with the SEC, this prospectus is continually updated and those future filings may modify or supersede some of the information included or incorporated in this prospectus. This means that you must look at all of the SEC filings that we incorporate by reference to determine if any of the statements in this prospectus or in any document previously incorporated by reference have been modified or superseded. This prospectus incorporates by reference the documents listed below (File No. 001-34504) and any future filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act (in each case, other than those documents or the portions of those documents not deemed to be filed) until all of the shares of common stock covered by this prospectus supplement are sold:

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Notwithstanding the foregoing, information furnished under Items 2.02 and 7.01 of any Current Report on Form 8-K, including the related exhibits under Item 9.01, is not incorporated by reference in this prospectus supplement.

You may request a copy of any or all of these documents, which will be provided to you at no cost, by writing or telephoning us using the following contact information:

Addus HomeCare Corporation

6801 Gaylord Parkway, Suite 110

Frisco Texas 75034

Attn: Secretary

Telephone: (469) 535-8200

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PROSPECTUS

$150,000,000

Common Stock

Preferred Stock

Warrants

Units

4,084,725 Shares of Common Stock

Offered by Selling Stockholders

We may offer and sell from time to time, in one or more series or issuances and on terms that we will determine at the time of the offering, any combination of common stock, preferred stock and warrants, either separately or in units, up to an aggregate amount of $150,000,000.

In addition, the selling stockholders identified in this prospectus may sell, from time to time, up to 4,084,725 shares of our common stock. We will not receive any proceeds from sales by the selling stockholders.

This prospectus describes some of the general terms that may apply to these securities and the general manner in which they may be offered. We will provide specific terms of any offering in a supplement to this prospectus. Any prospectus supplement may also add, update or change information contained in this prospectus. You should carefully read this prospectus and the applicable prospectus supplement as well as the documents incorporated or deemed to be incorporated by reference in this prospectus before you purchase any of the securities offered hereby.

These securities may be offered and sold in the same offering or in separate offerings; to or through underwriters, dealers, and agents; or directly to purchasers. The names of any underwriters, dealers, or agents involved in the sale of our securities and their compensation will be described in the applicable prospectus supplement.

The selling stockholders may sell these securities on a continuous or delayed basis directly, through agents, dealers or underwriters as designated from time to time, or through a combination of these methods. The names of any agents, dealers or underwriters involved in the sale of our securities and their compensation will be described in the applicable prospectus supplement. For additional information on the methods of sale, you should refer to the section entitled “Plan of Distribution.”

Our common stock is listed on the NASDAQ Stock Market LLC under the symbol “ADUS.” The last reported sale price of our common stock on the NASDAQ Stock Market LLC on December 6, 2016 was $34.80 per share. We will provide information in any applicable prospectus supplement regarding any listing of securities other than shares of our common stock on any securities exchange.

This prospectus may not be used to consummate a sale of our securities unless accompanied by the applicable prospectus supplement.

You should consider the risks that we have described in this prospectus and in the accompanying prospectus supplement before you invest. See “Risk Factors” on page 3.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The date of this prospectus is January 6, 2017

TABLE OF CONTENTS

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ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission, or the SEC, utilizing a “shelf” registration process. Under this shelf registration process, we may sell any combination of the securities registered in one or more offerings, up to a total dollar amount of $150,000,000. In addition, under this shelf process, the selling stockholders may sell from time to time up to 4,084,725 shares of our common stock. This prospectus provides you with general information regarding the securities that we and the selling stockholders may offer in the future. Each time we or the selling stockholders sell securities, we will provide a prospectus supplement that contains specific information about any offering by us or the selling stockholders, including the names of any selling stockholders, if applicable.

The prospectus supplement also may add, update or change information contained in the prospectus. You should read both this prospectus and the prospectus supplement related to any offering as well as additional information described under the heading “Where You Can Find More Information.”

We have not authorized anyone to provide you with information different from that contained or incorporated by reference in this prospectus or any accompanying prospectus supplement or any “free writing prospectus.” We are offering to sell, and seeking offers to buy, securities only in jurisdictions in which offers and sales are permitted. The information contained in this prospectus and in any accompanying prospectus supplement is accurate only as of the date of their covers, regardless of the time of delivery of this prospectus or any prospectus supplement or of any sale of our securities. Our business, financial condition, results of operations and prospects may have changed since those dates. You should rely only on the information contained or incorporated by reference in this prospectus or any accompanying prospectus supplement. To the extent there is a conflict between the information contained in this prospectus and the prospectus supplement, you should rely on the information in the prospectus supplement, provided that if any statement in one of these documents is inconsistent with a statement in another document having a later date — for example, a document incorporated by reference into this prospectus or any prospectus supplement — the statement in the document having the later date modifies or supersedes the earlier statement.

In this prospectus, the terms “we,” “our” and “us” refer to Addus HomeCare Corporation and its subsidiaries, unless otherwise specified.

PROSPECTUS SUMMARY

The following summary does not contain all of the information that may be important to purchasers of our securities. Prospective purchasers of securities should carefully review the detailed information and financial statements, including the notes thereto, appearing elsewhere in or incorporated by reference into this prospectus.

Our Company

We operate as one business segment and are a provider of comprehensive personal care services, which are provided primarily in the home. Our personal care services provide assistance with activities of daily living, and adult day services. Our consumers are primarily persons who are at risk of hospitalization or institutionalization, such as the elderly, chronically ill and disabled. Our payor clients include federal, state and local governmental agencies, managed care organizations, commercial insurers and private individuals. As of September 30, 2016, we provided personal care services to over 34,000 consumers through 118 locations across 24 states, including three adult day centers in Illinois. For the nine months ended September 30, 2016, we served approximately 45,000 discrete customers, and for the years ended December 31, 2015, 2014 and 2013, we served on average 48,000, 43,000 and 42,000 discrete consumers, respectively.

Our services were provided under agreements with state and local government agencies established to meet the needs of our consumers. Our consumers are predominately “dual eligible” and as such are eligible to receive

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both Medicare and Medicaid funded home-based personal care. The federal government encourages states to initiate dual eligible demonstration programs and other managed Medicaid initiatives, which are designed to coordinate the services provided through these programs with the overall objective of improving care and reducing costs. As a result, states are increasingly implementing managed care programs and as such are transitioning management of individuals such as our consumers to local and national managed care organizations. Under these arrangements, the managed care organizations have an economic incentive to provide personal care services to consumers as a means to better manage the acute care expenditures of their membership and place in a more cost effective setting. For the nine months ended September 30, 2016 and for the year ended December 31, 2015, managed care revenues accounted for 24.4% and 18.3% of our revenue mix, respectively. The personal care services we provide include assistance with bathing, grooming, dressing, personal hygiene, medication reminders, and other activities of daily living. We provide these services on a long-term, continuous basis, with an average duration of approximately 21 months per consumer. Our adult day centers provide a comprehensive program of skilled and support services and designated medical services for adults in a community-based group setting. Services provided by our adult day service centers include social activities, transportation services to and from the centers, the provision of meals and snacks, personal care and therapeutic activities such as exercise and cognitive interaction.

Our business model is designed to improve consumer outcomes and satisfaction, as well as lower the cost of acute care treatment and reduce service duplication. We believe our model to be especially valuable to managed care organizations that have economic responsibility for both personal care services as well as acute care expenditures. Over the long term, we believe our model will be a differentiator and as a result we expect to receive increased referrals from managed care organizations.

We utilize our home care aides to observe and report changes in the condition of our consumers for the purpose of early intervention in the disease process, thereby preventing or reducing the cost of medical services by reducing unnecessary emergency room visits and/or hospital admissions. We coordinate the services provided by our team with those of other healthcare agencies as appropriate. Changes in consumers’ conditions are evaluated by appropriately trained managers and referred to either appropriate medical personnel including the consumers’ primary care physicians or managed care organizations for treatment and follow-up. We believe that this approach to the care of our consumers and to the integration of our services into the broader healthcare continuum are attractive to managed care organizations and others who are ultimately responsible for the healthcare needs and costs of our consumers, and over time will increase our business with them.

We utilize Interactive Voice Response (“IVR”) systems and smart phone applications to communicate with the homecare aides. Through these applications we are able to identify changes in health conditions with automated alerts forwarded to appropriate management team for triaging and evaluation. In addition, the technology is used to record basic transaction information about each visit, including tracking start and end times of a scheduled shift, tracking mileage reimbursement, sending text messages to the homecare aide and communicating basic payroll information.

In addition to our focus on organic growth, we have been growing through selective acquisitions which expand our presence in current markets or which facilitate our entry into new markets where the personal care business is moving to managed care organizations. We completed seven acquisitions during the period from December 2013 through February 2016.

Our Offices

Our principal executive offices are located at 2300 Warrenville Road, Downers Grove, Illinois 60515. Our telephone number is (630) 296-3400. Our website is located at www.addus.com . Other than as described under the caption “Where You Can Find More Information” in this prospectus, the information on, or that can be accessed through, our website is not incorporated by reference in this prospectus or any prospectus supplement, and you should not consider it to be a part of this prospectus or any prospectus supplement. Our website address is included as an inactive textual reference only.

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The Securities That May Be Offered

We may offer up to $150,000,000 of common stock, preferred stock, warrants and units in one or more offerings and in any combination. In addition, the selling stockholders may offer up to 4,084,725 shares of common stock in one or more offerings and in any combination. In this prospectus, we refer to the common stock, preferred stock, warrants and units collectively as “securities.” This prospectus provides you with a general description of the securities we or the selling stockholders may offer. A prospectus supplement, which we will provide each time we offer securities, will describe the specific amounts, prices and terms of the securities that we or the selling stockholders offer. We will also include in the prospectus supplement information, when applicable, about material U.S. federal income tax considerations relating to the securities, and the securities exchange, if any, on which the securities will be listed. This prospectus may not be used to consummate a sale of securities unless it is accompanied by a prospectus supplement.

Common Stock

We may offer shares of our common stock, par value $0.001 per share, either alone or underlying other registered securities convertible or exercisable into our common stock. In addition, the selling stockholders may offer shares of our common stock. Each holder of our common stock is entitled to one vote for each share on all matters to be voted upon by the stockholders, and there are no cumulative rights. Subject to any preferential rights of any outstanding preferred stock, holders of our common stock are entitled to receive ratably the dividends, if any, as may be declared from time to time by the board of directors out of funds legally available therefor. If there is a liquidation, dissolution or winding up of our company, holders of our common stock would be entitled to share in our assets remaining after the payment of liabilities and any preferential rights of any outstanding preferred stock, if any.

Preferred Stock

Under the terms of our amended and restated certificate of incorporation, our board of directors is authorized to issue shares of preferred stock in one or more series without stockholder approval. Our board of directors has the discretion to determine the rights, preferences, privileges and restrictions, including voting rights, dividend rights, conversion rights, redemption privileges and liquidation preferences, of each series of preferred stock. Each series of preferred stock will be more fully described in the particular prospectus supplement that will accompany this prospectus, including redemption provisions, rights in the event of our liquidation, dissolution or winding up, voting rights and rights to convert into common stock.

Warrants

We may issue warrants for the purchase of common stock or preferred stock. We may issue warrants independently or together with other securities.

Units

We may issue units comprised of one or more of the other classes of securities issued by us as described in this prospectus in any combination. Each unit will be issued so that the holder of the unit is also the holder of each security included in the unit.

RISK FACTORS

Investing in our securities involves a high degree of risk. Please see the risk factors described under the caption “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2015, as well as “Risk Factors” in our Quarterly Reports on Form 10-Q for the fiscal quarters ended March 31, 2016, June 30, 2016 and September 30, 2016, and our other reports filed from time to time under the Securities Exchange Act of 1934, amended, or the Exchange Act. Before making an investment decision, you should carefully consider these

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risks as well as information we include or incorporate by reference in this prospectus and in any accompanying prospectus supplement. The risks and uncertainties we have described are not the only ones facing our company. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also affect our business operations.

FORWARD-LOOKING STATEMENTS

This prospectus and each prospectus supplement include and incorporate forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. Statements that are predictive in nature, that depend upon or refer to future events or conditions or that include words like “believes,” “belief,” “expects,” “plans,” “anticipates,” “intends,” “designs,” “projects,” “estimates,” “may,” “might,” “would,” “should,” and similar expressions are intended to be forward-looking statements as defined by the Private Securities Litigation Reform Act of 1995. These forward-looking statements involve a variety of risks and uncertainties that could cause actual results to differ materially from those described therein. These risks and uncertainties include, but are not limited to, the risks set forth in our filings with the Securities and Exchange Commission from time to time, including the risk factors set forth in Part II, Item 1A of our Quarterly Report on Form 10-Q for the period ended June 30, 2016, filed on August 8, 2016, and the risk factors set forth in Part I, Item 1A of our Annual Report on Form 10-K for the period ended December 31, 2015, filed on March 11, 2016. Because forward-looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified, you should not rely on any forward-looking statement as a prediction of future events. We expressly disclaim any obligation or undertaking and we do not intend to release publicly any updates or changes in our expectations concerning the forward-looking statements or any changes in events, conditions or circumstances upon which any forward-looking statement may be based, except as required by law.

PROSPECTUS SUPPLEMENTS

This prospectus provides you with a general description of the proposed offering of our securities. Each time that we or the selling stockholders sell securities under this prospectus, we will provide a prospectus supplement that will contain specific information about the terms of that offering. The prospectus supplement may add to, update or change information contained in this prospectus and should be read as superseding this prospectus.

You should read both this prospectus and any prospectus supplement together with additional information described under the heading “Where You Can Find More Information.”

The prospectus supplement will describe the terms of any offering of securities, including the offering price to the public in that offering, the purchase price and net proceeds of that offering, and the other specific terms related to that offering of securities.

USE OF PROCEEDS

Except as may be otherwise set forth in any prospectus supplement accompanying this prospectus, we will use the net proceeds we receive from sales of securities offered hereby for general corporate purposes, which may include the repayment of indebtedness outstanding from time to time and for working capital, capital expenditures, acquisitions and repurchases of our common stock or other securities. Pending these uses, the net proceeds may also be temporarily invested in short-term securities. When specific securities are offered, the prospectus supplement relating thereto will set forth our intended use of the net proceeds that we receive from the sale of such securities. We will have significant discretion in the use of any net proceeds. We will not receive any proceeds from the sale of shares of our common stock by the selling stockholders.

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PLAN OF DISTRIBUTION

We or the selling stockholders may sell the securities described in this prospectus from time to time in one or more of the following ways:

The prospectus supplement with respect to the offered securities will describe the terms of the offering, including the following:

We or the selling stockholders may distribute the securities from time to time in one or more of the following ways:

Unless otherwise indicated in the applicable prospectus supplement, if we use underwriters for a sale of securities, the underwriters will acquire the securities for their own account. The underwriters may resell the securities in one or more transactions, including negotiated transactions, at a fixed public offering price, or at varying prices determined at the time of sale. The obligations of the underwriters to purchase the securities will be subject to the conditions set forth in the applicable underwriting agreement. Unless otherwise indicated in a prospectus supplement, the underwriters will be obligated to purchase all of the securities offered if they purchase any of the securities offered. The underwriters may offer securities to the public either through underwriting syndicates represented by one or more managing underwriters or directly by one or more firms acting as underwriters. We may change from time to time any initial public offering price and any discounts or concessions that the underwriters allow or reallow or pay to dealers. We may use underwriters with whom we have a material relationship. We will describe in the prospectus supplement naming the underwriter the nature of any such relationship. We may use dealers in the sale of securities offered through this prospectus, in which case we will sell the securities to them as principals. The dealers may then resell those securities to the public at varying prices determined by the dealers at the time of resale. The prospectus supplement will include the names of the dealers and the terms of the transaction.

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We may designate agents who agree to use their reasonable efforts to solicit purchases for the period of their appointment or to sell securities on a continuing basis. We may also sell securities directly to one or more purchasers without using underwriters or agents. We may also issue securities as consideration in connection with future acquisitions. Underwriters, dealers or agents may receive compensation in the form of discounts, concessions or commissions from us or from purchasers of the securities as their agents in connection with the sale of the securities. These underwriters, dealers, or agents may be considered to be underwriters under the Securities Act. As a result, discounts, commissions or profits on resale received by underwriters, dealers or agents may be treated as underwriting discounts and commissions. Each prospectus supplement will identify any underwriter, dealer or agent and describe any compensation received by them from us. Any initial public offering price and any discounts or concessions allowed or reallowed or paid to dealers may be changed from time to time.

Unless otherwise specified in the applicable prospectus supplement, each class or series of securities will be a new issue with no established trading market, other than our common stock, which is listed on the NASDAQ Stock Market LLC. We may elect to list any other class or series of securities on any exchange, but we are not obligated to do so. It is possible that one or more underwriters may make a market in a class or series of securities, but the underwriters will not be obligated to do so and may discontinue any market making at any time without notice. We cannot give any assurance as to the liquidity of the trading market for any of the securities.

In connection with any offering, the underwriters may engage in stabilizing transactions, over-allotment transactions, syndicate covering transactions and penalty bids in accordance with Regulation M under the Exchange Act.

These stabilizing transactions, over-allotments, syndicate covering transactions and penalty bids may have the effect of raising or maintaining the market price of our common stock or preventing or retarding a decline in the market price of our common stock. As a result, the price of our common stock may be higher than the price that might otherwise exist in the open market. These transactions may be effected on the NASDAQ Stock Market LLC or otherwise and, if commenced, may be discontinued at any time.

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Underwriters, dealers and agents may be entitled under agreements entered into with us to indemnification against certain civil liabilities, including liabilities under the Securities Act, or to contribution with respect to payments they may be required to make in respect of these liabilities thereof. Underwriters, dealers and agents and their affiliates may be customers of, may engage in transactions with, or perform services for us in the ordinary course of business for which they receive compensation.

SELLING SECURITYHOLDERS

Certain shares of our common stock to which this prospectus relates are being registered for sale by (i) Eos Capital Partners III, L.P. and Eos Partners SBIC III, L.P., together, referred to as the Eos Funds, and (ii) W. Andrew Wright, III, James A. Wright, Courtney E. Panzer Living Trust II and Addus Term Trust, each as a selling stockholder. We have registered the shares to permit the selling stockholders and certain of their transferees after the date of this prospectus to sell the shares when they deem appropriate.

On September 19, 2006, we issued shares of preferred stock to the Eos Funds and shares of common stock to the seller stockholders in connection with our acquisition of Addus HealthCare, Inc., referred to as Addus HealthCare. Such shares of preferred stock converted into common stock in connection with our initial public offering consummated on November 2, 2009. We issued these securities in reliance upon Section 4(2) of the Securities Act as a transaction by an issuer not involving a public offering. Each such person had adequate access to information about us through its relationship with us or through information provided to them. We were advised by Courtney E. Panzer that she subsequently transferred her shares to the Courtney E. Panzer Living Trust II.

The following table sets forth the maximum number of shares of our common stock to be sold by the selling stockholders. The percentage of shares beneficially owned after the offering is based on 11,463,501 shares of our common stock outstanding as of December 6, 2016. Except as otherwise indicated, the selling stockholders have sole voting and dispositive power with respect to such shares. We have prepared this table using information furnished to us by or on behalf of the selling stockholders.

Relationship between the Selling Stockholders and Us

On September 19, 2006, we entered into a Registration Rights Agreement to which the selling stockholders were parties. Pursuant to the terms of the Registration Rights Agreement, the selling stockholders were granted

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“piggyback” registration rights to register the restricted shares of common stock held by the selling stockholders. The shares held by certain of such stockholders are included in the registration statement of which this prospectus is a part. The selling stockholders may sell all, a portion or none of their shares at any time.

DESCRIPTION OF SECURITIES WE OR THE SELLING STOCKHOLDERS MAY OFFER

The following is a general description of the terms and provisions of the securities we or the selling stockholders may offer and sell by this prospectus. These summaries are not meant to be complete. This prospectus and the applicable prospectus supplement will contain the material terms and conditions of each security. The prospectus supplement may add, update or change the terms and conditions of the securities as described in this prospectus.

DESCRIPTION OF COMMON STOCK

This section describes the general terms of our common stock. A prospectus supplement may provide information that is different from this prospectus. If the information in the prospectus supplement with respect to our common stock being offered differs from this prospectus, you should rely on the information in the prospectus supplement. A copy of our amended and restated certificate of incorporation has been incorporated by reference from our filings with the SEC as an exhibit to the registration statement of which this prospectus forms a part. Our common stock and the rights of the holders of our common stock are subject to the applicable provisions of the Delaware General Corporation Law, or the DGCL, our amended and restated certificate of incorporation, and our amended and restated bylaws.

As of December 6, 2016 under our amended and restated certificate of incorporation, we had the authority to issue 40,000,000 shares of common stock, par value $0.001 per share, of which 11,463,501 shares of our common stock were outstanding.

The following description of our common stock, and any description of our common stock in a prospectus supplement, may not be complete and is subject to, and qualified in its entirety by, reference to, the DGCL and the actual terms and provisions contained in our amended and restated certificate of incorporation and amended and restated bylaws, each as amended from time to time.

Voting Rights

Each outstanding share of our common stock is entitled to one vote per share of record on all matters submitted to a vote of stockholders. At a meeting of stockholders at which a quorum is present, for all matters other than the election of directors, all questions shall be decided by the vote of the holders of a majority of the outstanding shares of stock entitled to vote thereon present in person or by proxy at the meeting, unless the matter is one upon which a different vote is required by express provision of law or our amended and restated certificate of incorporation or amended and restated bylaws. Directors will be elected by a plurality of the votes of the shares present at a meeting. There is no provision for cumulative voting for the election of directors in our amended and restated certificate of incorporation. This means that the holders of a plurality of the shares voted can elect all of the directors then standing for election.

Dividends

Holders of our common stock are entitled to receive dividends or other distributions when, as, and if declared by our board of directors. The right of our board of directors to declare dividends, however, is subject to any rights of the holders of other classes of our capital stock, any indebtedness outstanding from time to time and the availability of sufficient funds under the DGCL to pay dividends.

Preemptive Rights

The holders of our common stock do not have preemptive rights to purchase or subscribe for any of our capital stock or other securities.

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Redemption

The shares of our common stock are not subject to redemption by operation of a sinking fund or otherwise.

Liquidation Rights

In the event of any liquidation, dissolution or winding up of our company, subject to the rights, if any, of the holders of other classes of our capital stock, the holders of shares of our common stock are entitled to receive any of our assets available for distribution to our stockholders ratably in proportion to the number of shares held by them.

Registration Rights

We have granted certain stockholders, who are a party to a Registration Rights Agreement, “piggyback” registration rights with respect to their shares of our common stock. As a result, the shares held by certain stockholders subject to the Registration Rights Agreement are included in the registration statement of which this prospectus is a part.

Options and Restricted Stock Awards

From time to time, we have issued and expect to continue to issue options and restricted stock awards to certain of our employees, directors and consultants. As of December 6, 2016, we had outstanding (i) stock options to purchase 468,880 shares of our common stock, of which 128,016 shares of common stock were issuable, upon exercise of vested stock options as of that date; and (ii) 258,848 restricted stock awards, of which 137,325 were vested as of such date.

Listing

Our common stock is listed on the NASDAQ Stock Market LLC under the symbol “ADUS.”

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is Computershare, 462 South 4^th Street, Louisville, Kentucky 40202.

DESCRIPTION OF PREFERRED STOCK

This section describes the general terms of our preferred stock to which any prospectus supplement may relate. A prospectus supplement will describe the terms relating to any preferred stock to be offered by us in greater detail and may provide information that is different from terms described in this prospectus. If the information in the prospectus supplement with respect to the particular preferred stock being offered differs from this prospectus, you should rely on the information in the prospectus supplement. A copy of our amended and restated certificate of incorporation has been incorporated by reference from our filings with the SEC as an exhibit to the registration statement of which this prospectus forms a part. A certificate of designation or amendment to our amended and restated certificate of incorporation will specify the terms of the preferred stock being offered, and it will be filed or incorporated by reference as an exhibit to the registration statement before the preferred stock is issued. The following description of our preferred stock, and any description of the preferred stock in a prospectus supplement, may not be complete and is subject to, and qualified in its entirety by reference to, the DGCL and the actual terms and provisions contained in our amended and restated certificate of incorporation and amended and restated bylaws, each as amended from time to time.

As of December 6, 2016 under our amended and restated certificate of incorporation, we had the authority to issue 10,000,000 shares of preferred stock, par value $0.001 per share, which are issuable in series on terms to be determined by our board of directors. Accordingly, our board of directors is authorized, without action by the stockholders, to issue preferred stock from time to time with such dividend, liquidation, conversion, voting and

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other rights and restrictions as it may determine. All shares of any one series of our preferred stock will be identical, except that shares of any one series issued at different times may differ as to the dates from which dividends may be cumulative. All series shall rank equally and shall provide for other terms as described in the applicable prospectus supplement. As of December 6, 2016 there were no outstanding shares of our preferred stock.

The issuance of preferred stock, while providing desirable flexibility in connection with possible acquisitions and other corporate purposes, could have the effect of delaying, deferring or preventing a change in control without further action by our stockholders and may adversely affect the market price of, and the voting and other rights of, the holders of our common stock.

Terms of Preferred Stock to Be Offered

Any prospectus supplement offering our preferred stock will furnish the following information with respect to the preferred stock offered by that prospectus supplement:

Rank

The rank information of the preferred stock will be indicated in the applicable prospectus supplement.

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Distributions

The distribution rights, if any, of the preferred stock will be indicated in the applicable prospectus supplement.

Voting Rights

The voting rights, if any, of the preferred stock will be indicated in the applicable prospectus supplement.

Liquidation Preference

The liquidation preference, if any, of the preferred stock will be indicated in the applicable prospectus supplement.

Conversion Rights

The terms and conditions, if any, upon which shares of any series of preferred stock are convertible into other securities will be set forth in the applicable prospectus supplement. These terms will include the amount and type of security into which the shares of preferred stock are convertible, the conversion price (or manner of calculation thereof), the conversion period, provisions as to whether conversion will be at the option of the holders of the preferred stock or us, the events requiring an adjustment of the conversion price and provisions affecting conversion in the event of the redemption of that preferred stock.

Redemption

The redemption information, if any, of the preferred stock will be indicated in the applicable prospectus supplement. No series of preferred stock will receive the benefit of a sinking fund except as set forth in the applicable prospectus supplement.

Registrar and Transfer Agent

The registrar and transfer agent for our preferred stock will be set forth in the applicable prospectus supplement.

If our board of directors decides to issue any preferred stock, it may discourage or make more difficult a merger, tender offer, business combination or proxy contest, assumption of control by a holder of a large block of our securities, or the removal of incumbent management, even if these events were favorable to the interests of stockholders. Our board of directors, without stockholder approval, may issue preferred stock with voting and conversion rights and dividend and liquidation preferences that may adversely affect the holders of our other equity securities.

DESCRIPTION OF WARRANTS

General

We may issue warrants to purchase common stock (which we refer to as common stock warrants) or preferred stock (which we refer to as preferred stock warrants). Any of these warrants may be issued independently or together with any other securities offered by this prospectus and may be attached to or separate from those securities.

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While the terms we have summarized below will generally apply to any future warrants we may offer under this prospectus, we will describe the particular terms of any warrants that we may offer in more detail in the applicable prospectus supplement. The terms of any warrants we offer under a prospectus supplement may differ from the terms we describe below.

We may issue the warrants under a warrant agreement, which we will enter into with a warrant agent to be selected by us. Each warrant agent will act solely as our agent under the applicable warrant agreement and will not assume any obligation or relationship of agency or trust with any holder of any warrant. A single bank or trust company may act as warrant agent for more than one issue of warrants. A warrant agent will have no duty or responsibility in case of any default by us under the applicable warrant agreement or warrant, including any duty or responsibility to initiate any proceedings at law or otherwise, or to make any demand upon us. Any holder of a warrant may, without the consent of the related warrant agent or the holder of any other warrant, enforce by appropriate legal action its right to exercise, and receive the securities purchasable upon exercise of, its warrants.

We will incorporate by reference into the registration statement of which this prospectus is a part the form of warrant agreement, including a form of warrant certificate, that describes the terms of the series of warrants we are offering before the issuance of the related series of warrants. The following summaries of material provisions of the warrants and the warrant agreements are subject to, and qualified in their entirety by reference to, all the provisions of the warrant agreement applicable to a particular series of warrants. We urge you to read the applicable prospectus supplements related to the warrants that we sell under this prospectus, as well as the complete warrant agreements that contain the terms of the warrants.

We will set forth in the applicable prospectus supplement the terms of the warrants in respect of which this prospectus is being delivered, including, when applicable, the following:

Unless specified in an applicable prospectus supplement, common stock warrants or preferred stock warrants will be in registered form only.

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A holder of warrant certificates may exchange them for new certificates of different denominations, present them for registration of transfer and exercise them at the corporate trust office of the warrant agent or any other office indicated in the applicable prospectus supplement. Until any common stock warrants or preferred stock warrants are exercised, holders of the warrants will not have any rights of holders of the underlying common stock or preferred stock except to the extent set forth under the heading “Warrant Adjustments” below.

Exercise of Warrants

Each warrant will entitle the holder to purchase for cash shares of common stock or preferred stock at the applicable exercise price set forth in, or determined as described in, the applicable prospectus supplement. Unless we otherwise specify in the applicable prospectus supplement, Warrants may be exercised at any time up to the close of business on the expiration date set forth in the applicable prospectus supplement. After the close of business on the expiration date, unexercised warrants will become void.

Unless we otherwise specify in the applicable prospectus supplement, warrants may be exercised by delivering to the corporation trust office of the warrant agent or any other officer indicated in the applicable prospectus supplement the warrant certificate properly completed and duly executed and payment of the amount due upon exercise. As soon as practicable following exercise, we will forward the shares of common stock or preferred stock. If less than all of the warrants represented by a warrant certificate are exercised, a new warrant certificate will be issued for the remaining warrants. If we so indicate in the applicable prospectus supplement, holders of the warrants may surrender securities as all or a part of the exercise price for the warrants.

Amendments and Supplements to the Warrant Agreements

We may amend or supplement a warrant agreement without the consent of the holders of the applicable warrants to cure ambiguities in the warrant agreement, to cure or correct a defective provision in the warrant agreement or to provide for other matters under the warrant agreement that we and the warrant agent deem necessary or desirable, so long as, in each case, such amendments or supplements do not materially adversely affect the interests of the holders of the warrants.

Warrant Adjustments

Unless the applicable prospectus supplement states otherwise, the exercise price of, and the number of securities covered by, a common stock warrant or preferred stock warrant will be adjusted proportionately if we subdivide or combine our common stock or preferred stock, as applicable. In addition, unless the prospectus supplement states otherwise, if we, without payment:

then the holders of common stock warrants and preferred stock warrants, as applicable, will be entitled to receive upon exercise of the warrants, in addition to the securities otherwise receivable upon exercise of the warrants and without paying any additional consideration, the amount of stock and other securities and property such holders would have been entitled to receive had they held the common stock or preferred stock, as applicable, issuable under the warrants on the dates on which holders of those securities received or became entitled to receive such additional stock and other securities and property.

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Except as stated above, the exercise price and number of securities covered by a common stock warrant and preferred stock warrant, and the amounts of other securities or property to be received, if any, upon exercise of those warrants, will not be adjusted or provided for if we issue those securities or any securities convertible into or exchangeable for those securities, or securities carrying the right to purchase those securities or securities convertible into or exchangeable for those securities.

Holders of common stock warrants and preferred stock warrants may have additional rights under the following circumstances:

If one of the above transactions occurs and holders of our common stock or preferred stock are entitled to receive stock, securities or other property with respect to or in exchange for their securities, the holders of the common stock warrants and preferred stock warrants, as applicable, will be entitled to receive upon exercise of their warrants the kind and amount of shares of stock and other securities or property that they would have received upon the applicable transaction if they had exercised their warrants immediately before the transaction.

DESCRIPTION OF UNITS

The following description, together with the additional information we include in any applicable prospectus supplement, summarizes the material terms and provisions of the units that we may offer under this prospectus. Units may be offered independently or together with common stock, preferred stock and warrants offered by any prospectus supplement, and may be attached to or separate from those securities. While the terms we have summarized below will generally apply to any future units that we may offer under this prospectus, we will describe the particular terms of any series of units that we may offer in more detail in the applicable prospectus supplement. The terms of any units offered under a prospectus supplement may differ from the terms described below.

We will incorporate by reference from reports that we file with the SEC, the form of unit agreement that describes the terms of the series of units we are offering, and any supplemental agreements, before the issuance of the related series of units. The following summaries of material terms and provisions of the units are subject to, and qualified in their entirety by reference to, all the provisions of the unit agreement applicable to a particular series of units. We urge you to read the applicable prospectus supplements related to the particular series of units that we may offer under this prospectus, as well as any related free writing prospectus and the complete unit agreement and any supplemental agreements that contain the terms of the units.

General

We may issue units consisting of common stock, preferred stock and/or warrants in any combination. Each unit will be issued so that the holder of the unit is also the holder of each security included in the unit. Thus, the holder of a unit will have the rights and obligations of a holder of each security included in the unit. The unit agreement under which a unit is issued may provide that the securities included in the unit may not be held or transferred separately, at any time, or at any time before a specified date.

We will describe in the applicable prospectus supplement the terms of the series of units being offered, including:

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The provisions described in this section, as well as those set forth in any prospectus supplement or as described under “Description of Common Stock,” “Description of Preferred Stock” and “Description of Warrants,” will apply to each unit, as applicable, and to any common stock, preferred stock or warrant included in each unit, as applicable.

Unit Agent

The name and address of the unit agent for any units we offer will be set forth in the applicable prospectus supplement.

Issuance in Series

We may issue units in such amounts and in such numerous distinct series as we determine.

Enforceability of Rights by Holders of Units

Each unit agent will act solely as our agent under the applicable unit agreement and will not assume any obligation or relationship of agency or trust with any holder of any unit. A single bank or trust company may act as unit agent for more than one series of units. A unit agent will have no duty or responsibility in case of any default by us under the applicable unit agreement or unit, including any duty or responsibility to initiate any proceedings at law or otherwise, or to make any demand upon us. Any holder of a unit may, without the consent of the related unit agent or the holder of any other unit, enforce by appropriate legal action its rights as holder under any security included in the unit.

Title

We, the unit agent, and any of their agents may treat the registered holder of any unit certificate as an absolute owner of the units evidenced by that certificate for any purposes and as the person entitled to exercise the rights attaching to the units so requested, despite any notice to the contrary.

CERTAIN PROVISIONS OF THE DGCL AND OUR CHARTER AND BYLAWS

The following paragraphs summarize certain provisions of the DGCL and our amended and restated certificate of incorporation and amended and restated bylaws. The summary does not purport to be complete and is subject to and qualified in its entirety by reference to the DGCL and to our amended and restated certificate of incorporation and amended and restated bylaws, copies of which are on file with the SEC as exhibits to reports previously filed by us. See “Where You Can Find More Information.”

Anti-Takeover Effects

Provisions in our amended and restated certificate of incorporation and bylaws and anti-takeover provisions of the DGCL could discourage, delay or prevent an unsolicited change in control of our company, which could adversely affect the price of our common stock. These provisions may also have the effect of making it more difficult for third parties to replace our current management without the consent of the board of directors.

Staggered Board

Our amended and restated certificate of incorporation and bylaws divide our board of directors into three classes with staggered three-year terms. In addition, a director may be removed only for cause and only by the

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affirmative vote of the holders of at least 66 2/3% of the voting power of the stockholders entitled to vote at an election for directors of the Corporation, voting as a single class. Any newly created directorship or any vacancy occurring in the Board for any cause may be filled by a majority of the remaining members of the Board, although such majority is less than a quorum, or by the sole remaining director. The classification of our board of directors and the limitations on the removal of directors and filling of vacancies could make it more difficult for a third party to acquire, or discourage a third party from seeking to acquire, control of our company.

Special Meetings of Stockholders; Stockholder Action by Written Consent

Our amended and restated certificate of incorporation provides that any action required or permitted to be taken by our stockholders must be effected at a duly called annual or special meeting of such holders and may not be effected by any consent in writing by such holders. Our amended and restated certificate of incorporation and bylaws also provide that, except as otherwise required by law, special meetings of our stockholders can only be called by our chairman of the board or our board of directors.

Super-majority stockholder vote required for certain actions.

The DGCL provides generally that the affirmative vote of a majority of the shares entitled to vote on any matter is required to amend a corporation’s certificate of incorporation or bylaws, unless the corporation’s certificate of incorporation or bylaws, as the case may be, requires a greater percentage. A 66 2/3% vote is required for an amendment to or repeal of, our amended and restated certificate of incorporation by our stockholders, unless such amendment or repeal is declared advisable by the Board by the affirmative vote of at least 75% of the entire Board.

Authorization of undesignated preferred stock

Our amended and restated certificate of incorporation permits our board of directors to issue up to 10,000,000 shares of preferred stock, with any rights, preferences and privileges as they may designate (including the right to approve an acquisition or other change in our control).

Provisions of DGCL Governing Business Combinations

In general, we are subject to Section 203 of the DGCL. This section generally prohibits us from engaging in mergers and other business combinations with stockholders that beneficially own 15% or more of our voting stock, or with their affiliates, unless our directors or stockholders approve the business combination in the prescribed manner. However, because the Eos Funds acquired their shares prior to our initial public offering on November 2, 2009, Section 203 is currently inapplicable to any business combination with the Eos Funds or their affiliates. In addition, our amended and restated bylaws require that any stockholder proposals or nominations for election to our board of directors must meet specific advance notice requirements and procedures, which make it more difficult for our stockholders to make proposals or director nominations.

Limitation of Liability and Indemnification of Officers and Directors

Our amended and restated certificate of incorporation and amended and restated bylaws limit the liability of directors to the fullest extent permitted by the DGCL. In addition, our amended and restated certificate of incorporation provides that we will indemnify our directors to the fullest extent permitted by law, and our amended and restated bylaws provides that we will indemnify our directors and officers to the fullest extent permitted by law. We have also entered into indemnification agreements with each of our directors.

Indemnification for Securities Act Liabilities

Insofar as indemnification for liabilities arising under the Securities Act may be permitted for directors, officers or controlling persons pursuant to the provisions described in the preceding paragraph, we have been informed that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is therefore unenforceable.

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LEGAL OWNERSHIP OF SECURITIES

We can issue securities in registered form or in the form of one or more global securities. We refer to those persons who have securities registered in their own names on the books that we or any applicable trustee, depositary or warrant agent maintain for this purpose as the “holders” of those securities. These persons are the legal holders of the securities. We refer to those persons who, indirectly through others, own beneficial interests in securities that are not registered in their own names as “indirect holders” of those securities. As we discuss below, indirect holders are not legal holders, and investors in securities issued in book-entry form or in street name will be indirect holders.

Book-Entry Holders

We may issue securities in book-entry form only, as we will specify in the applicable prospectus supplement. This means securities may be represented by one or more global securities registered in the name of a financial institution that holds them as depositary on behalf of other financial institutions that participate in the depositary’s book-entry system. These participating institutions, which are referred to as participants, in turn, hold beneficial interests in the securities on behalf of themselves or their customers. Upon the issuance of a global security, the depositary will credit, on its book-entry registration and transfer system, the participants’ accounts with the respective principal amounts of the book-entry securities represented by the global security beneficially owned by such participants. The accounts to be credited will be designated by any dealers, underwriters or agents participating in the distribution of the book-entry securities. Ownership of book-entry securities will be shown on, and the transfer of the ownership interests will be effected only through, records maintained by the depositary for the related global security (with respect to interests of participants) and on the records of participants (with respect to interests of persons holding through participants). The laws of some states may require that certain purchasers of securities take physical delivery of such securities in definitive form. These laws may impair the ability to own, transfer or pledge beneficial interests in book-entry securities.

Only the person in whose name a security is registered is recognized as the holder of that security. Securities issued in global form will be registered in the name of the depositary or its participants. Consequently, for securities issued in global form, we will recognize only the depositary as the holder of the securities, and we will make all payments on the securities to the depositary. The depositary passes along the payments it receives to its participants, which in turn pass the payments along to their customers who are the beneficial owners. The depositary and its participants do so under agreements they have made with one another or with their customers; they are not obligated to do so under the terms of the securities.

As a result, investors in a book-entry security will not own securities directly. Instead, they will own beneficial interests in a global security, through a bank, broker or other financial institution that participates in the depositary’s book-entry system or holds an interest through a participant. As long as the securities are issued in global form, investors will be indirect holders, and not legal holders, of the securities.

Street Name Holders

We may terminate a global security or issue securities that are not issued form. In these cases, investors may choose to hold their securities in their own names or in “street name.” Securities held by an investor in street name would be registered in the name of a bank, broker or other financial institution that the investor chooses, and the investor would hold only a beneficial interest in those securities through an account he, she or it maintains at that institution.

For securities held in street name, we or the applicable trustee, depositary or warrant agent will recognize only the intermediary banks, brokers and other financial institutions in whose names the securities are registered as the holders of those securities, and we will make all payments on those securities to them. These institutions pass along the payments they receive to their customers who are the beneficial owners, but only because they agree to do so in their customer agreements or because they are legally required to do so. Investors who hold securities in street name will be indirect holders, not holders, of those securities.

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Legal Holders

Our obligations, as well as the obligations of any applicable trustee or third party employed by us or a trustee, run only to the legal holders of the securities. We do not have obligations to investors who hold beneficial interests in global securities, in street name, or by any other indirect means. This will be the case whether an investor chooses to be an indirect holder of a security or has no choice because we are issuing the securities only in global form.

For example, once we make a payment or give a notice to the holder, we have no further responsibility for the payment or notice even if that holder is required, under agreements with depositary participants or customers or by law, to pass it along to the indirect holders but does not do so. In such an event, we would seek approval only from the holders, and not the indirect holders, of the securities. Whether and how the holders contact the indirect holders is up to the holders.

Special Considerations For Indirect Holders

If you hold securities through a bank, broker or other financial institution, either in book-entry form because the securities are represented by one or more global securities or in street name, you should check with your own institution to determine the following:

Global Securities

A global security is a security that represents one or any other number of individual securities held by a depositary. Generally, all securities represented by the same global securities will have the same terms. Each security issued in book-entry form will be represented by a global security that we issue to, deposit with and register in the name of a financial institution or its nominee that we select. The financial institution that we select for this purpose is called the depositary. Unless we specify otherwise in the applicable prospectus supplement, The Depository Trust Company, New York, New York, known as DTC, will be the depositary for all securities issued in book-entry form.

A global security may not be transferred to or registered in the name of anyone other than the depositary, its nominee or a successor depositary, unless special termination situations arise. We describe those situations below under “Special Situations When a Global Security Will Be Terminated.” As a result of these arrangements, the depositary, or its nominee, will be the sole registered owner and legal holder of all securities represented by a global security, and investors will be permitted to own only beneficial interests in a global security. Beneficial interests must be held by means of an account with a broker, bank or other financial institution that in turn has an account with the depositary or with another institution that does. Thus, an investor whose security is represented by a global security will not be a legal holder of the security, but only an indirect holder of a beneficial interest in the global security.

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If the prospectus supplement for a particular security indicates that the security will be issued in global form only, then the security will be represented by a global security at all times unless and until the global security is terminated. If termination occurs, we may issue the securities through another book-entry clearing system or decide that the securities may no longer be held through any book-entry clearing system.

We may at any time and in our sole discretion determine not to have any of the book-entry securities of any series represented by one or more global securities and, in that event, we will issue certificated securities in exchange for the global securities of that series.

Special Considerations For Global Securities

The rights of an indirect holder relating to a global security will be governed by the account rules of the investor’s financial institution and of the depositary, as well as general laws relating to securities transfers. We do not recognize an indirect holder as a holder of securities and instead deal only with the depositary that holds the global security.

If securities are issued only in the form of a global security, an investor should be aware of the following:

There may be more than one financial intermediary in the chain of ownership for an investor. We do not monitor and are not responsible for the actions of any of those intermediaries.

Special Situations When a Global Security Will Be Terminated

In a few special situations described below, the global security will terminate and interests in it will be exchanged for physical certificates representing those interests. After that exchange, the choice of whether to

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hold securities directly or in street name will be up to the investor. Investors must consult their own banks or brokers to find out how to have their interests in securities transferred to their own name, so that they will be direct holders. We have described the rights of holders and street name investors above.

Unless we provide otherwise in the applicable prospectus supplement, the global security will terminate when the following special situations occur:

The applicable prospectus supplement may also list additional situations for terminating a global security that would apply only to the particular types and series of securities covered by the prospectus supplement. When a global security terminates, the depositary, and neither we nor any applicable trustee, is responsible for deciding the names of the institutions that will be the initial direct holders.

LEGAL MATTERS

The validity of the securities offered hereby will be passed upon by Bass, Berry & Sims PLC, Nashville, Tennessee.

EXPERTS

The financial statements and schedule as of December 31, 2015 and 2014 and for each of the three years in the period ended December 31, 2015 and management’s assessment of the effectiveness of internal control over financial reporting as of December 31, 2015 incorporated by reference in this prospectus have been so incorporated in reliance on the reports of BDO USA, LLP, an independent registered public accounting firm, incorporated herein by reference, given on the authority of said firm as experts in auditing and accounting.

WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly, and current reports, proxy statements and other information with the SEC under the Exchange Act. Through our website at www.addus.com, you may access, free of charge, our filings, as soon as reasonably practical after we electronically file them with or furnish them to the SEC. Other information contained in our website is not incorporated by reference in, and should not be considered a part of, this prospectus or any accompanying prospectus supplement. You also may read and copy any document we file at the SEC’s public reference room at 100 F Street, N.E., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for further information on the public reference room. Our SEC filings are also available to the public from the SEC’s website at www.sec.gov.

This prospectus is part of a registration statement on Form S-3 that we filed with the SEC to register the securities offered hereby under the Securities Act. This prospectus does not contain all of the information included in the registration statement, including certain exhibits and schedules. You may obtain the registration statement and exhibits to the registration statement from the SEC at the address listed above or from the SEC’s website.

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INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to incorporate by reference the information we file with the SEC, which means that we can disclose important information to you by referring you to those documents. The information that we incorporate by reference is considered to be part of this prospectus. Information that we file with the SEC in the future and incorporate by reference in this prospectus automatically updates and supersedes previously filed information as applicable.

We incorporate by reference into this prospectus the following documents filed by us with the SEC, other than any portion of any such documents that are not deemed “filed” under the Exchange Act in accordance with the Exchange Act and applicable SEC rules:

We also incorporate by reference into this prospectus all documents (other than any portions of any such documents that are not deemed “filed” under the Exchange Act in accordance with the Exchange Act and applicable SEC rules) filed by us under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of the initial registration statement and before effectiveness of the registration statement, and after the date of this prospectus.

You may request a copy of these filings at no cost, by writing or telephoning us as follows:

Addus HomeCare Corporation

Attention: Corporate Secretary

2300 Warrenville Road

Downers Grove, Illinois 60515

(630) 296-3400

Any statement contained in a document that is incorporated by reference will be modified or superseded for all purposes to the extent that a statement contained in this prospectus or any accompanying prospectus supplement, or in any other document that is subsequently filed with the SEC and incorporated by reference, modifies or is contrary to that previous statement. Any statement so modified or superseded will not be deemed a part of this prospectus or any accompanying prospectus supplement, except as so modified or superseded. Since information that we later file with the SEC will update and supersede previously incorporated information, you should look at all of the SEC filings that we incorporate by reference to determine if any of the statements in this prospectus or any accompanying prospectus supplement or in any documents previously incorporated by reference have been modified or superseded.

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2,100,000 Shares

Common Stock

Prospectus Supplement

Jefferies

RBC Capital Markets

Raymond James

Baird

Oppenheimer & Co.

Stephens Inc.

                , 2018