Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

Donohue Ann K.

2. Date of Event Requiring Statement (MM/DD/YYYY) 5/7/2019

3. Issuer Name and Ticker or Trading Symbol

SELECTA BIOSCIENCES INC [SELB]

(Last) (First) (Middle)

480 ARSENAL WAY

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

_____ Director _____ 10% Owner
___ X ___ Officer (give title below) _____ Other (specify below)
Controller /

(Street)

WATERTOWN, MA 02472

(City) (State) (Zip)

5. If Amendment, Date Original Filed (MM/DD/YYYY)

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 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	1216	D

*Table II - Derivative Securities Beneficially Owned ( e.g.* , puts, calls, warrants, options, convertible securities)**
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
Stock Option (Right to Buy)	⁽¹⁾	3/22/2027	Common Stock	5100.0	$10.89	D
Stock Option (Right to Buy)	⁽²⁾	6/15/2027	Common Stock	1108.0	$17.47	D
Stock Option (Right to Buy)	⁽³⁾	6/11/2028	Common Stock	10000.0	$12.46	D
Stock Option (Right to Buy)	⁽⁴⁾	1/6/2029	Common Stock	25000.0	$2.6	D

Explanation of Responses:
(1)	This option vested as to 25% on September 12, 2017. The remainder of the underlying shares vest in 36 equal monthly installments thereafter.
(2)	This option vested as to 25% on June 16, 2018. The remainder of the underlying shares vest in 36 equal monthly installments thereafter.
(3)	This option will vest as to 25% on June 12, 2019. The remainder of the underlying shares will vest in 36 equal monthly installments thereafter.
(4)	This option will vest as to 25% on January 7, 2020. The remainder of the underlying shares vest in 36 equal monthly installments thereafter.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Donohue Ann K. 480 ARSENAL WAY WATERTOWN, MA 02472			Controller

Signatures
Ann K. Donohue		5/15/2019
^** 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).
**	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 control number.