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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. 215 First Street Cambridge MA 02142	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
Common Stock	Acquisiton	2016-04-07	1,712	$0.48	24,439	No	4	M	Direct
Common Stock	Acquisiton	2016-04-07	7,500	$0.71	31,939	No	4	M	Direct
Common Stock	Disposition	2016-04-07	9,212	$30.00	22,727	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
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	2016-04-07	1,712	$0.00	1,712	$0.48
Common Stock	Stock Option (right to buy)	Disposition	2016-04-07	7,500	$0.00	7,500	$0.71

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
82,500		2023-11-06	No	4	M	Direct
1,668,251		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 February 26, 2016.
The option vested as to 25% of the shares subject to the option on September 9, 2014. The remainder of the shares have vested or will vest in 12 equal quarterly installments thereafter.
The option vested as to 25% of the shares subject to the option on June 1, 2015. The remainder of the shares have vested or will vest in 12 equal quarterly installments thereafter.