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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1609809	Seres Therapeutics Inc.	MCRB	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1435744	Thomas Desrosier	C/O Seres Therapeutics, Inc. 200 Sidney Street Cambridge MA 02139	See Remarks	No	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	2018-01-26	10,000	$0.00	10,000	No	4	M	Direct
Common Stock	Disposition	2018-01-26	3,475	$11.02	6,525	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	2018-01-26	10,000	$0.00	10,000	$0.00
Common Stock	STOCK OPTION (RIGHT TO BUY)	Disposition	2018-01-30	80,000	$0.00	80,000	$10.42
Common Stock	STOCK OPTION (RIGHT TO BUY)	Disposition	2018-01-30	100,000	$0.00	100,000	$10.42

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
40,000		No	4	M	Direct
80,000	2028-01-29	No	4	A	Direct
100,000	2028-01-29	No	4	A	Direct

Footnotes

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.
These restricted stock units have vested and settled or will vest and settle as to 20% of the restricted stock units on January 26, 2018, 30% on January 26, 2019; and 50% on January 26, 2020.
This Option will vest as to 25% of the shares on January 30, 2019. The remainder of the shares will vest in 12 equal quarterly installments thereafter.
This Option will vest as to one third of the shares on January 30, 2019, one third on January 30, 2020 and one third on January 30, 2021.