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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1453687	Selecta Biosciences Inc	SELB	()	4

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1055624	A Timothy Springer	36 Woodman Road Chestnut Hill MA 02467	Yes	No	No	No
1677543	Tas Partners, Llc	36 Woodman Road Chestnut Hill MA 02467	Yes	No	No	No
1677554	Leukon Investments, Lp	36 Woodman Road Chestnut Hill MA 02467	Yes	No	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	2016-06-27	506,015	$0.00	527,028	No	4	C	Indirect	See Footnote
Common Stock	Acquisiton	2016-06-27	425,874	$0.00	445,576	No	4	C	Indirect	See Footnote
Common Stock	Acquisiton	2016-06-27	710,000	$14.00	1,237,028	No	4	P	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See Footnote
No	4	C	Indirect	See Footnote
No	4	P	Indirect	See Footnote

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series B Convertible Preferred Stock	Disposition	2016-06-27	157,864	$0.00	157,864	$0.00
Common Stock	Series B Convertible Preferred Stock	Disposition	2016-06-27	157,864	$0.00	157,864	$0.00
Common Stock	Series C Convertible Preferred Stock	Disposition	2016-06-27	153,742	$0.00	153,742	$0.00
Common Stock	Series C Convertible Preferred Stock	Disposition	2016-06-27	93,954	$0.00	93,954	$0.00
Common Stock	Series D Convertible Preferred Stock	Disposition	2016-06-27	63,547	$0.00	63,547	$0.00
Common Stock	Series D Convertible Preferred Stock	Disposition	2016-06-27	51,355	$0.00	51,355	$0.00
Common Stock	Series E Convertible Preferred Stock	Disposition	2016-06-27	84,421	$0.00	130,862	$0.00
Common Stock	Series E Convertible Preferred Stock	Disposition	2016-06-27	79,156	$0.00	122,701	$0.00

Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect

Footnotes

Held by Leukon Investments LP ("Leukon").
Held by TAS Partners, LLC ("TAS").
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.
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.
LKST, Inc. is the general partner of Leukon. Timothy Springer is the president of LKST, Inc. and the managing member of TAS. Each of the reporting persons disclaims beneficial ownership of the securities reported herein except to the extent of their pecuniary interest therein.