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

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1. Name and Address of Reporting Person * Polaris Venture Management Co. V, L.L.C.   2. Issuer Name and Ticker or Trading Symbol GENOCEA BIOSCIENCES, INC. [GNCA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O POLARIS VENTURE PARTNERS, 1000 WINTER STREET SUITE 3350 3. Date of Earliest Transaction (Month/Day/Year) 06/18/2015 (Street) WALTHAM, MA 02451 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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 06/18/2015   S   29,004 (1) D $ 13.04 (2) 1,969,606 (3) I By the Polaris Funds (4) Common Stock 06/19/2015   S   1,000 (5) D $ 13 (6) 1,968,606 (7) I By the Polaris Funds (4)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Polaris Venture Management Co. V, L.L.C. C/O POLARIS VENTURE PARTNERS 1000 WINTER STREET SUITE 3350 WALTHAM, MA 02451		X
Polaris Venture Partners V, L.P. C/O POLARIS VENTURE PARTNERS 1000 WINTER STREET SUITE 3350 WALTHAM, MA 02451		X
Polaris Venture Partners Entrepreneurs' Fund V, L.P. C/O POLARIS VENTURE PARTNERS 1000 WINTER STREET SUITE 3350 WALTHAM, MA 02451		X
Polaris Venture Partners Founders' Fund V, L.P. C/O POLARIS VENTURE PARTNERS 1000 WINTER STREET SUITE 3350 WALTHAM, MA 02451		X
Polaris Venture Partners Special Founders' Fund V, L.P. C/O POLARIS VENTURE PARTNERS 1000 WINTER STREET SUITE 3350 WALTHAM, MA 02451		X

Signatures

/s/ John Gannon, for Polaris Venture Management Co. V, L.L.C.		06/19/2015
**Signature of Reporting Person		Date
/s/ John Gannon, for Polaris Venture Partners V, L.P.		06/19/2015
**Signature of Reporting Person		Date
/s/ John Gannon, for Polaris Venture Partners Entrepreneurs Fund V, L.P.		06/19/2015
**Signature of Reporting Person		Date
/s/ John Gannon, for Polaris Venture Partners Founders' Fund V, L.P.		06/19/2015
**Signature of Reporting Person		Date
/s/ John Gannon, for Polaris Venture Partners Special Founders' Fund V, L.P.		06/19/2015
**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)	Consists of 27,987 shares sold by Polaris Venture Partners V, LP ("PVP-V"); 545 shares sold by Polaris Venture Partners Entrepreneurs' Fund V, L.P. ("PVP-E"); 192 shares sold by Polaris Venture Partners Founders' Fund V, L.P. ("PVP-F"); and 280 shares sold by Polaris Venture Partners Special Founders' Fund V, L.P. ("PVP-S"). PVP-V, PVP-E, PVP-F and PVP-S may be referred to herein collectively as the "Polaris Funds"
(2)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.00 to $13.42. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(3)	Consists of 1,900,542 shares directly beneficially owned by PVP-V; 37,038 shares directly beneficially owned by PVP-E; 13,019 shares directly beneficially owned by PVP-F; and 19,007 shares directly beneficially owned by PVP-S.
(4)	Jonathan Flint and Terrance McGuire, managing members of Polaris Venture Management Co. V, L.L.C., exercise voting and investment power with respect to Polaris Venture Management Co. V, L.L.C. As members of the general partner and North Star Venture Management 2000, LLC, the Polaris Management Members may be deemed to share voting and investment powers for the shares held by the Polaris Funds. The Polaris Management Members disclaim beneficial ownership of all such shares held by the funds and this report shall not be deemed an admission of beneficial ownership of such shares for the purposes of Section 16 or for any other purpose, except to the extent of their proportionate pecuniary interests therein. Kevin Bitterman, a director of the Issuer, has an assignee interest in Polaris Venture Management Co. V, L.L.C. To the extent that he is deemed to share voting and investment powers with respect to the shares held by the Polaris Funds, Dr. Bitterman disclaims (cont.)
(5)	Consists of 964 shares sold by PVP-V; 19 shares sold by PVP-E; 7 shares sold by PVP-F; and 10 shares sold by PVP-S.
(6)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.00 to $13.10. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(7)	Consists of 1,899,578 shares directly beneficially owned by PVP-V; 37,019 shares directly beneficially owned by PVP-E; 13,012 shares directly beneficially owned by PVP-F; and 18,997 shares directly beneficially owned by PVP-S.
Remarks: (footnote (4) continued) beneficial ownership of all the shares held by the funds and this report shall not be deemed an admission of beneficial ownership of such shares for the purposes of Section 16 or for any other purpose, except to the extent of his proportionate pecuniary interest therein.

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