Sec Form 4 Filing - AFEYAN NOUBAR @ Seres Therapeutics, Inc. - 2015-06-25

Insider filing report for Changes in Beneficial Ownership
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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
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
AFEYAN NOUBAR
2. Issuer Name and Ticker or Trading Symbol
Seres Therapeutics, Inc. [ MCRB]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X __ Director X __ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last) (First) (Middle)
1 MEMORIAL DRIVE, 7TH FLOOR
3. Date of Earliest Transaction (MM/DD/YY)
06/25/2015
(Street)
CAMBRIDGE, MA02142
4. If Amendment, Date Original Filed (MM/DD/YY)
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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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, $0.001 par value 06/26/2015 C 8,822,420 A 8,822,420 I See Footnote ( 1 )
Common Stock, $0.001 par value 06/26/2015 C 2,205,603 A 2,205,603 I See Footnote ( 2 )
Common Stock, $0.001 par value 06/26/2015 C 599,297 A 599,297 I See Footnote ( 3 )
Common Stock, $0.001 par value 3,055,556 I See Footnote ( 6 )
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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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
(MM/DD/YY)
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
Series A Convertible Preferred Stock ( 4 ) 06/26/2015 C 6,105,362 ( 4 ) ( 4 ) Common Stock 6,105,362 $ 0 0 I See Footnote ( 1 )
Series A Convertible Preferred Stock ( 4 ) 06/26/2015 C 1,526,338 ( 4 ) ( 4 ) Common Stock 1,526,338 $ 0 0 I See Footnote ( 2 )
Series A Convertible Preferred Stock ( 4 ) 06/26/2015 C 599,297 ( 4 ) ( 4 ) Common Stock 599,297 $ 0 0 I See Footnote ( 3 )
Series A-2 Convertible Preferred Stock ( 4 ) 06/26/2015 C 898,877 ( 4 ) ( 4 ) Common Stock 898,877 $ 0 0 I See Footnote ( 1 )
Series A-2 Convertible Preferred Stock ( 4 ) 06/26/2015 C 224,719 ( 4 ) ( 4 ) Common Stock 224,719 $ 0 0 I See Footnote ( 2 )
Series B Convertible Preferred Stock ( 4 ) 06/26/2015 C 1,818,181 ( 4 ) ( 4 ) Common Stock 1,818,181 $ 0 0 I See Footnote ( 1 )
Series B Convertible Preferred Stock ( 4 ) 06/26/2015 C 454,546 ( 4 ) ( 4 ) Common Stock 454,546 $ 0 0 I See Footnote ( 2 )
Stock Option (right to buy) $ 18 06/25/2015 A 15,000 ( 5 ) 06/24/2025 Common Stock 15,000 $ 0 15,000 I See Footnote ( 5 )
Reporting Owners
Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
AFEYAN NOUBAR
1 MEMORIAL DRIVE, 7TH FLOOR
CAMBRIDGE, MA02142
X X
Flagship Ventures Fund 2007, L.P.
1 MEMORIAL DRIVE, 7TH FLOOR
CAMBRIDGE, MA02142
X
Flagship Ventures Fund IV, L.P.
1 MEMORIAL DRIVE, 7TH FLOOR
CAMBRIDGE, MA02142
X
Flagship Ventures Fund IV-Rx, L.P.
1 MEMORIAL DRIVE, 7TH FLOOR
CAMBRIDGE, MA02142
X
Flagship Ventures 2007 General Partner LLC
1 MEMORIAL DRIVE, 7TH FLOOR
CAMBRIDGE, MA02142
X
Flagship Ventures Fund IV General Partner LLC
1 MEMORIAL DRIVE, 7TH FLOOR
CAMBRIDGE, MA02142
X
KANIA EDWIN M JR
1 MEMORIAL DRIVE, 7TH FLOOR
CAMBRIDGE, MA02142
X
Signatures
FLAGSHIP VENTURES FUND 2007, L.P., By: Flagship Ventures 2007 General Partner, LLC, By: /s/ Noubar Afeyan, Name: Noubar B. Afeyan, Title: Manager 06/26/2015
Signature of Reporting Person Date
FLAGSHIP VENTURES 2007 GENERAL PARTNER, LLC, By: /s/ Noubar Afeyan, Name: Noubar B. Afeyan, Title: Manager 06/26/2015
Signature of Reporting Person Date
FLAGSHIP VENTURES FUND IV, L.P., By: Flagship Ventures Fund IV General Partner, LLC, By: /s/ Noubar Afeyan, Name: Noubar B. Afeyan, Title: Manager 06/26/2015
Signature of Reporting Person Date
FLAGSHIP VENTURES FUND IV GENERAL PARTNER LLC, By: /s/ Noubar Afeyan, Name: Noubar B. Afeyan, Title: Manager 06/26/2015
Signature of Reporting Person Date
FLAGSHIP VENTURES FUND IV-RX, L.P., By: Flagship Ventures 2007 General Partner, LLC, By: /s/ Noubar Afeyan, Name: Noubar B. Afeyan, Title: Manager 06/26/2015
Signature of Reporting Person Date
FLAGSHIP VENTURELABS IV, LLC, By: Flagship Ventures Fund IV General Partner LLC, By: /s/ Noubar Afeyan 06/26/2015
Signature of Reporting Person Date
NOUBAR B. AFEYAN, PH.D, /s/ Noubar Afeyan 06/26/2015
Signature of Reporting Person Date
EDWIN M. KANIA, JR., /s/ Edwin Kania, Jr. 06/26/2015
Signature of Reporting Person Date
Explanation of Responses:
( 1 )Held by Flagship Ventures Fund IV, L.P. ("Flagship Fund IV"). Flagship Ventures Fund IV General Partner LLC ("Flagship Fund IV GP") is the general partner of Flagship Fund IV. Noubar B. Afeyan, Ph.D. and Edwin M. Kania, Jr. are the managers of Flagship Fund IV GP and each of these individuals may be deemed to share voting and investment power with respect to all shares held by Flagship Fund IV. Each of the filing persons disclaims beneficial ownership of the shares except to the extent of his or its pecuniary interest therein.
( 2 )Held by Flagship Ventures Fund IV-Rx, L.P. ("Flagship IV-Rx"). Flagship Fund IV GP is the general partner of Flagship IV Rx. Noubar B. Afeyan, Ph.D. and Edwin M. Kania, Jr. are the managers of Flagship Fund IV GP and each of these individuals may be deemed to share voting and investment power with respect to all shares held by Flagship IV-Rx. Each of the filing persons disclaims beneficial ownership of the shares except to the extent of his or its pecuniary interest therein.
( 3 )Held by Flagship Ventures Fund 2007, L.P. ("Flagship 2007"). Flagship Ventures 2007 General Partner LLC ("Flagship 2007 LLC") is the general partner of Flagship 2007. Noubar B. Afeyan, Ph.D. and Edwin M. Kania, Jr. are the managers of Flagship 2007 LLC and each of these individuals may be deemed to share voting and investment power with respect to all shares held by Flagship 2007. Each of the filing persons disclaims beneficial ownership of the shares except to the extent of his or its pecuniary interest therein.
( 4 )Each class of preferred stock converted into Common Stock on a one-for-one basis upon the listing of the issuer's securities on The NASDAQ Global Select Exchange and had no expiration date.
( 5 )Held by Noubar B. Afeyan, Ph.D. The option will vest as to 25% of the shares on June 25, 2016. The remainder of the shares will vest in 12 equal monthly installments.
( 6 )Held by Flagship VentureLabs IV LLC ("Flagship VentureLabs"). Flagship Fund IV is a member of Flagship VentureLabs and also serves as its manager. Flagship Fund IV GP is the general partner of Flagship Fund IV. Noubar B. Afeyan, Ph.D. and Edwin M. Kania, Jr. are the managers of Flagship Fund IV GP. Each of these individuals and entities may be deemed to share voting and investment power with respect to all shares held by Flagship VentureLabs. Each of the filing persons disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein.

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