SEC Form 4 
FORM 4	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
or Section 30(h) of the Investment Company Act of 1940 	  
OMB APPROVAL
OMB Number:	3235-0287	
Estimated average burden	
hours per response:	0.5	

	
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).			
1. Name and Address of Reporting Person*
GORDON CARL L	

(Last)	(First)	(Middle)	
C/O SELECTA BIOSCIENCES, INC.	
480 ARSENAL STREET, BUILDING ONE	

(Street) 
WATERTOWN	MA	02472	

(City)	(State)	(Zip)	
	2. Issuer Name and Ticker or Trading Symbol 
SELECTA BIOSCIENCES INC [ SELB ] 	5. Relationship of Reporting Person(s) to Issuer 
(Check all applicable) 
X	Director	X	10% Owner	
	Officer (give title below)		Other (specify below)	

	3. Date of Earliest Transaction (Month/Day/Year)
06/27/2016 		
	4. If Amendment, Date of 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	
	
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	06/27/2016		C		11,111	A	$0 	12,193	I	See Footnote(1)(5) 	
Common Stock	06/27/2016		C		1,166,884	A	$0 	1,280,604	I	See Footnote(2)(5) 	
Common Stock	06/27/2016		P		5,189	A	$14 	17,382	I	See Footnote(1)(5) 	
Common Stock	06/27/2016		P		544,811	A	$14 	1,825,415	I	See Footnote(2)(5) 	
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 Securities Underlying Derivative Security (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: 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 C Convertible Preferred Stock	(3)	06/27/2016		C			3,628	(3) 	(3) 	Common Stock	3,628	$0 	0	I	See Footnote(1)(5) 	
Series C Convertible Preferred Stock	(3)	06/27/2016		C			380,986	(3) 	(3) 	Common Stock	380,986	$0 	0	I	See Footnote(2)(5) 	
Series D Convertible Preferred Stock	(3)	06/27/2016		C			739	(3) 	(3) 	Common Stock	739	$0 	0	I	See Footnote(1)(5) 	
Series D Convertible Preferred Stock	(3)	06/27/2016		C			77,697	(3) 	(3) 	Common Stock	77,697	$0 	0	I	See Footnote(2)(5) 	
Series E Convertible Preferred Stock	(4)	06/27/2016		C			4,351	(4) 	(4) 	Common Stock	6,744	$0 	0	I	See Footnote(1)(5) 	
Series E Convertible Preferred Stock	(4)	06/27/2016		C			456,870	(4) 	(4) 	Common Stock	708,201	$0 	0	I	See Footnote(2)(5) 	
Explanation of Responses:	
1. The reportable securities are owned directly by OrbiMed Associates III, LP ("Associates III"). OrbiMed Advisors LLC ("Advisors") is the general partner of Associates III. Samuel D. Isaly ("Isaly"), a natural person, is the managing member of and owner of a controlling interest in Advisors. By virtue of such relationships, Advisors and Isaly may be deemed to have voting and investment power over the securities held by Associates III and as a result may be deemed to have beneficial ownership over such securities. The Reporting Person is a member of Advisors.	
2. The reportable securities are owned directly by OrbiMed Private Investments III, LP ("OPI III"). OrbiMed Capital GP III LLC ("GP III") is the general partner of OPI III, and Advisors is the managing member of GP III. Isaly is the managing member of and owner of a controlling interest in Advisors. By virtue of such relationships, GP III, Advisors and Isaly may be deemed to have voting and investment power over the securities held by OPI III and as a result may be deemed to have beneficial ownership over such securities.	
3. The preferred stock is convertible at any time, at the holder's election and has no expiration date. The preferred stock automatically converted into common stock on a 1-for-1 basis upon the closing of the Issuer's initial public offering.	
4. The Series E Convertible Preferred Stock is convertible at any time, at the holder's election and has no expiration date. The Series E Convertible Preferred Stock automatically converted into common stock on an approximately 1-for-1.550115 basis upon the closing of the Issuer's initial public offering.	
5. Each of GP III, Advisors, Islay and the reporting person disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed an admission that any of GP III, Advisors, Islay, or the Reporting Person is a beneficial owner for the purpose of Section 16 of the Exchange Act, or for any other purpose.	
	/s/ David Siewers, attorney-in-fact	06/29/2016	
	** 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 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).	
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
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 Number.