Cartesian Therapeutics, Inc. — Director's Dealing 2017

May 19, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: SELECTA BIOSCIENCES INC (SELB)
CIK: 0001453687
Period of Report: 2017-05-17

Reporting Person: SPRINGER TIMOTHY A (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-17	Common Stock	P	11244	$14.006	Acquired	11244	Direct
2017-05-18	Common Stock	P	4860	$14.00	Acquired	16104	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1237028	Indirect
Common Stock	445576	Indirect

Footnotes

F1: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $13.64 to $14.20, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F2: LKST, Inc. is the general partner of Leukon Investments LP. Timothy Springer is the president of LKST, Inc. and the managing member of TAS Partners, LLC. The Reporting Person disclaims beneficial ownership of the securities held by Leukon Investments LP and TAS Partners, LLC except to the extent of his pecuniary interest therein, if any.

F3: Held by Leukon Investments LP.

F4: Held by TAS Partners, LLC.