Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
Papaefstathiou Efstathios
   2. Issuer Name and Ticker or Trading Symbol
CRAY INC [CRAY] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP, R&D
(Last)
(First)
(Middle)
C/O CRAY INC., 901 FIFTH AVENUE, SUITE 1000		 3. Date of Earliest Transaction (Month/Day/Year)
05/17/2018
(Street)

SEATTLE, WA 98164		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 05/18/2018   M   8,750 A (1) 14,171 D  
Common Stock 05/18/2018   F   3,269 (2) D $ 26.8 (3) 10,902 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Unit (RSU) (1) 05/17/2018   A   21,000     (4)   (4) Common Stock 21,000 $ 0 21,000 D  
Stock option (right to buy) $ 27.1 05/17/2018   A   21,000     (5) 05/17/2028 Common Stock 21,000 $ 0 21,000 D  
Restricted Stock Unit (RSU) (1) 05/18/2018   M     8,750   (6)   (6) Common Stock 8,750 $ 0 26,250 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Papaefstathiou Efstathios
C/O CRAY INC., 901 FIFTH AVENUE
SUITE 1000
SEATTLE, WA 98164		       SVP, R&D  

Signatures

 /s/ Michael C. Piraino as attorney-in-fact for Efstathios Papaefstathiou   05/20/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Each restricted stock unit represents a contingent right to receive one share of the issuer's Common Stock.
(2) Represents shares of Common Stock that were withheld by the issuer to satisfy applicable withholding taxes in connection with the net settlement of the restricted stock units listed in Table II and does not represent a sale of Common Stock by the reporting person.
(3) Represents the per share closing price of the issuer's Common Stock on the applicable vesting date or, if there was no closing price on such date, the closing price on the trading date that was immediately prior to such vesting date.
(4) One-quarter of these shares vest on each of May 17, 2019, May 17, 2020, May 17, 2021 and May 17, 2022, subject to the reporting person's provision of service to the issuer on each vesting date.
(5) One-quarter of these shares vest on May 17, 2019 and 1/48th of these shares vest monthly thereafter, with 100% of the total shares vested and exercisable on May 17, 2022, subject to the reporting person's provision of service to the issuer on each vesting date.
(6) On May 18, 2017, the reporting person was granted 35,000 restricted stock units, with one quarter vesting on each of May 18, 2018, May 18, 2019, May 18, 2020 and May 18, 2021, subject to the reporting person's provision of service to the issuer on each vesting date.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.