Cartesian Therapeutics, Inc. — Director's Dealing 2017

Sep 22, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: SELECTA BIOSCIENCES INC (SELB)
CIK: 0001453687
Period of Report: 2017-09-20

Reporting Person: Siewers David (CFO and Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-09-20	Common Stock	M	2194	$0.63	Acquired	2194	Direct
2017-09-20	Common Stock	S	2194	$20.00	Disposed	0	Direct
2017-09-20	Common Stock	M	14230	$0.63	Acquired	14230	Direct
2017-09-20	Common Stock	S	14230	$20.00	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-09-20	Employee Stock Option (right to buy)	$0.63	M	2194	Disposed	2020-09-06	Common Stock (2194)	Direct
2017-09-20	Employee Stock Option (right to buy)	$0.63	M	14230	Disposed	2021-02-16	Common Stock (14230)	Direct

Footnotes

F1: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 21, 2016.

F2: All shares underlying this option are fully vested.