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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1453687	Selecta Biosciences Inc	SELB	Pharmaceutical Preparations (2834)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1760229	Carsten Brunn	C/O Selecta Biosciences, Inc. 65 Grove Street Watertown MA 02472	President And Ceo	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2021-03-01	10,937	$0.00	222,287	No	4	M	Direct
Common Stock	Disposition	2021-03-02	5,461	$4.26	216,826	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Units	Disposition	2021-03-01	10,937	$0.00	10,937	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
76,563			No	4	M	Direct

Footnotes

Shares sold to satisfy withholding tax obligations upon the vesting of restricted stock units and to cover related broker fees.
The price reported is a weighted average price. The shares were sold in multiple transactions at per share prices ranging from $4.24 to $4.285. The Reporting Person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
Each restricted stock unit represents a contingent right to receive one share of common stock.
This restricted stock unit vested as to 25% on December 1, 2019 and has vested, and will continue to vest, as to an additional 8.33% each quarter thereafter until fully vested. The restricted stock units have no expiration date.