Eric D. Shaff

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
18 Feb 25	MCRB Seres Therapeutics	Common Stock	Sell	Dispose S	No	Yes	0.8105	12,726	10.31 k	192,039
15 Feb 25	MCRB Seres Therapeutics	Common Stock	Option exercise	Acquire M	No	No	0	26,563	0.00	204,765
15 Feb 25	MCRB Seres Therapeutics	Common Stock	Option exercise	Acquire M	No	No	0	7,813	0.00	178,202
15 Feb 25	MCRB Seres Therapeutics	RSU Common Stock	Option exercise	Dispose M	No	No	0	26,563	0.00	79,687
15 Feb 25	MCRB Seres Therapeutics	RSU Common Stock	Option exercise	Dispose M	No	No	0	7,813	0.00	62,500
7 Feb 25	MCRB Seres Therapeutics	Stock Option Common Stock	Grant	Acquire A	No	No	0.782	1,950,000	1.52 mm	1,950,000
18 Nov 24	MCRB Seres Therapeutics	Common Stock	Sell	Dispose S	No	Yes	0.5409	2,505	1.35 k	170,389
15 Nov 24	MCRB Seres Therapeutics	Common Stock	Option exercise	Acquire M	No	No	0	7,812	0.00	172,894
15 Nov 24	MCRB Seres Therapeutics	RSU Common Stock	Option exercise	Dispose M	No	No	0	7,812	0.00	70,313
28 Oct 24	MCRB Seres Therapeutics	Common Stock	Sell	Dispose S	No	Yes	0.6901	8,748	6.04 k	165,082

Data from 3, 4 and 5 filings. Values as filed, not updated for current price.