UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 Semgroup Energy Partners LP (Name of Issuer) Common Stock (Title of Class of Securities) 81662W108 (CUSIP Number) February 14, 2008 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [ ] Rule 13d-1(b) [ X ] Rule 13d-1(c) [ ] Rule 13d-1(d) CUSIP No. 81662W108 1.Names of Reporting Persons. GPS Partners LLC I.R.S. Identification Nos. of above persons (entities only). 73-1735371 2.Check the Appropriate Box if a Member of a Group (a) [ ] (b) [ ] 3.SEC Use Only 4.Citizenship or Place of Incorporaion California, United States Number of 5.Sole Voting Power 18,000 Shares Beneficially 6.Shared Voting Power None Owned by Each 7.Sole Dispositive Power 18,000 Reporting Person With 8.Shared Dispositive Power None 9.Aggregate Amount Beneficially Owned by Each Reporting Person 18,000 10.Check if the Aggregate Amount in Row (9) Excludes Certain Shares [ ] 11.Percent of Class Represented by Amount in Row (9) 0.13% 12.Type of Reporting Person: IA CUSIP No. 81662W108 1.Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only). Brett S. Messing 2.Check the Appropriate Box if a Member of a Group (a) [ ] (b) [ ] 3.SEC Use Only 4.Citizenship or Place of Incorporaion United States Number of 5.Sole Voting Power 18,000 Shares Beneficially 6.Shared Voting Power None Owned by Each 7.Sole Dispositive Power 18,000 Reporting Person With 8.Shared Dispositive Power None 9.Aggregate Amount Beneficially Owned by Each Reporting Person 18,000 10.Check if the Aggregate Amount in Row (9) Excludes Certain Shares [ ] 11.Percent of Class Represented by Amount in Row (9) 0.13% 12.Type of Reporting Person: HC Item 1(a). Name of Issuer: Semgroup Energy Partners LP Item 1(b). Address of Issuer's Principal Executive Offices: TWO WARREN PLACE 6120 SOUTH YALE AVENUE, SUITE 700 TULSA OK 74136 Item 2(a). Name of Person Filing Item 2(b). Address of Principal Business Office or, if None, Residence Item 2(c). Citizenship GPS Partners LLC 100 Wilshire Blvd. Suite 900 Santa Monica, CA 90401 California, United States Brett S. Messing 100 Wilshire Blvd. Suite 900 Santa Monica, CA 90401 California, United States United States Item 2(d). Title of Class of Securities: Common Stock Item 2(e). CUSIP Number: 81662W108 Item 3. GPS Partners LLC is an investment advisor in accordance with ss.240.13d-1(b)(1)(ii)(E). Brett S. Messing is a control person in accordance with ss.240.13d-1(b)(1)(ii)(G). Item 4. Ownership: a. Amount beneficially owned: 18,000 b. Percent of Class: 0.13% c. Number of shares as to which the person has: (i) Sole power to vote or to direct the vote 18,000 (ii) Shared power to vote or to direct the vote None (iii)Sole power to dispose or to direct the disposition of 18,000 (iv) Shared power to dispose or to direct the disposition None Item 5. Ownership of Five Percent or Less of a Class: [X] Item 6. Ownership of More than Five Percent on Behalf of Another Person: Not Applicable Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company of Control Person: Not applicable. Item 8. Identification and Classification of Members of the Group: Not applicable. Item 9. Notice of Dissolution of Group: Not applicable. Item 10.Certification: By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date February 14, 2008 GPS Partners LLC By:/s/ Steven A. Sugarman Steven A. Sugarman Title: Partner By: /s/ Brett S. Messing ---------------------------- Name: Brett S. Messing Title: Managing Partner JOINT FILING AGREEMENT The undersigned hereby agree that the Statement on this Schedule 13G/A, dated February 14, 2008, (the "Schedule 13G/A"), with respect to the Common Stock of Semgroup Energy Partners LP is filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities and Exchange Act of 1934, as amended, and that this Agreement shall be included as an Exhibit to this Schedule 13G/A. Each of the undersigned agrees to be responsible for the timely filing of the Schedule 13G/A, and for the completeness and accuracy of the information concerning itself contained therein. This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument. IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the 14th day of February 2008. GPS Partners LLC By: /s/ Steven A. Sugarman --------------------------- Name: Steven A. Sugarman Title: Partner By: /s/ Brett S. Messing ---------------------------- Name: Brett S. Messing Title: Managing Partner Statement of Control Person The Statement on this Schedule 13G/A dated February 14, 2008 with respect to the common stock of Semgroup Energy Partners LP is filed by Brett S. Messing in accordance with the provisions of Rule 13d-1(c) and Rule 13d-1(k),respectively, as control person (HC) of GPS Partners LLC. GPS Partners LLC files this statement on Schedule 13G/A in accordance with the provisions of Rule 13d-1(c) and Rule 13d-1(k), respectively, as investment advisors (IA).