SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Flagship Ventures Fund 2007, L.P.

(Last)

(First)

(Middle)

ONE MEMORIAL DRIVE, 7TH FLOOR

(Street)

CAMBRIDGE

02142

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
06/21/2016

3. Issuer Name and Ticker or Trading Symbol
SELECTA BIOSCIENCES INC [ SELB ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

5. If Amendment, Date of 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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	31,115	I	See Footnote⁽¹⁾

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Series A Convertible Preferred Stock	⁽²⁾	⁽²⁾	Common Stock	318,752	⁽²⁾	I	See Footnote⁽¹⁾
Series B Convertible Preferred Stock	⁽²⁾	⁽²⁾	Common Stock	631,458	⁽²⁾	I	See Footnote⁽¹⁾
Series C Convertible Preferred Stock	⁽²⁾	⁽²⁾	Common Stock	235,042	⁽²⁾	I	See Footnote⁽¹⁾
Series D Convertible Preferred Stock	⁽²⁾	⁽²⁾	Common Stock	241,718	⁽²⁾	I	See Footnote⁽¹⁾
Series E Convertible Preferred Stock	⁽²⁾	⁽²⁾	Common Stock	125,008	⁽²⁾	I	See Footnote⁽¹⁾
Common Warrants	07/24/2015	07/24/2018	Common Stock	20,262	$17.55	I	See Footnote⁽¹⁾

1. Name and Address of Reporting Person^*

Flagship Ventures Fund 2007, L.P.

(Last)

(First)

(Middle)

ONE MEMORIAL DRIVE, 7TH FLOOR

(Street)

CAMBRIDGE

02142

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Flagship Ventures 2007 General Partner LLC

(Last)

(First)

(Middle)

ONE MEMORIAL DRIVE, 7TH FLOOR

(Street)

CAMBRIDGE

02142

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

AFEYAN NOUBAR

(Last)

(First)

(Middle)

ONE MEMORIAL DRIVE, 7TH FLOOR

(Street)

CAMBRIDGE

02142

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

KANIA EDWIN M JR

(Last)

(First)

(Middle)

ONE MEMORIAL DRIVE, 7TH FLOOR

(Street)

CAMBRIDGE

02142

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. 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. 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 such shares except to the extent of his or its pecuniary interest therein.

2. The preferred stock is convertible at any time, at the holder's election and has no expiration date. The preferred stock will automatically convert into common stock upon the closing of the Issuer's initial public offering.

Remarks:

Exhibit 24 - Power of Attorney Flagship Ventures Fund 2007, L.P., Flagship Ventures 2007 General Partner LLC and Noubar B. Afeyan are directors by deputization based on Edwin M. Kania, Jr.'s position on the Issuer's Board of Directors.

	FLAGSHIP VENTURES FUND 2007, L.P. By: Flagship Ventures 2007 General Partner LLC By: /s/ Noubar B. Afeyan, Ph.D., Manager	06/21/2016
	FLAGSHIP VENTURES 2007 GENERAL PARTNER LLC By: /s/ Noubar B. Afeyan, Ph.D., Manager	06/21/2016
	s/ Noubar B. Afeyan, Ph.D.	06/21/2016
	/s/ Edwin M. Kania Jr.	06/21/2016
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
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