Thomas DesRosier

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	4,300	3.49 k	142,456
15 Feb 25	MCRB Seres Therapeutics	Common Stock	Option exercise	Acquire M	No	No	0	8,907	0.00	146,756
15 Feb 25	MCRB Seres Therapeutics	Common Stock	Option exercise	Acquire M	No	No	0	2,657	0.00	137,849
15 Feb 25	MCRB Seres Therapeutics	RSU Common Stock	Option exercise	Dispose M	No	No	0	8,907	0.00	26,718
15 Feb 25	MCRB Seres Therapeutics	RSU Common Stock	Option exercise	Dispose M	No	No	0	2,657	0.00	21,250
7 Feb 25	MCRB Seres Therapeutics	Stock Option Common Stock	Grant	Acquire A	No	No	0.782	650,000	508.30 k	650,000
18 Nov 24	MCRB Seres Therapeutics	Common Stock	Sell	Dispose S	No	Yes	0.5407	878	474.73	135,192
15 Nov 24	MCRB Seres Therapeutics	Common Stock	Option exercise	Acquire M	No	No	0	2,656	0.00	136,070
15 Nov 24	MCRB Seres Therapeutics	RSU Common Stock	Option exercise	Dispose M	No	No	0	2,656	0.00	23,907
28 Oct 24	MCRB Seres Therapeutics	Common Stock	Sell	Dispose S	No	Yes	0.6901	4,259	2.94 k	133,414

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