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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1609809	Seres Therapeutics Inc.	MCRB	Pharmaceutical Preparations (2834)	274326290

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1614936	Roger Pomerantz	C/O Seres Therapeutics, Inc. 200 Sidney Street Cambridge MA 02139	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	2018-07-11	1,010	$0.71	229,314	No	4	M	Direct
Common Stock	Disposition	2018-07-11	1,010	$9.01	228,304	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	STOCK OPTION (RIGHT TO BUY)	Disposition	2018-07-11	1,010	$0.00	1,010	$0.71

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
797,536		2024-08-07	No	4	M	Direct

Footnotes

The sale reported in the Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 15, 2018.
The price reported is a weighted average price. The shares were sold in multiple transactions at per share prices ranging from $9.00 to $9.04. 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.
The option vested as to 25% of the shares on June 1, 2015. The remainder of the shares have vested or will vest in 12 equal quarterly installments thereafter.