MCRB

Seres Therapeutics, Inc.

Company with tickers: MCRB

CIK

1609809

CUSIP

81750R201

Shares Outstanding

9,683,934

13F Activity (30d)

32 filings 30 filers

Trades by corporate insiders — officers, directors and holders of more than 10% of the shares — disclosed to the SEC on Forms 3, 4 and 5. Form 4 must be filed within two business days of the trade.

Date	Insider	Role	Type	Shares	Price	Value	After
2026-05-18	Brady Kelly	See Remarks	Sell	59	$7.53	$444	8,562
2026-05-18	Shaff Eric D.	Director	Sell	259	$7.53	$1,950	12,040
2026-05-18	Henn Matthew R	See Remarks	Sell	77	$7.53	$580	7,838
2026-05-18	DesRosier Thomas	See Remarks	Sell	79	$7.53	$595	7,954
2026-05-15	DesRosier Thomas	See Remarks	Convert	111	—	—	779
2026-05-15	DesRosier Thomas	See Remarks	Convert	244	—	—	8,033
2026-05-15	Brady Kelly	See Remarks	Convert	91	—	—	639
2026-05-15	Brady Kelly	See Remarks	Convert	89	—	—	269
2026-05-15	Shaff Eric D.	Director	Convert	331	—	—	2,325
2026-05-15	Shaff Eric D.	Director	Convert	722	—	—	12,299
2026-05-15	Henn Matthew R	See Remarks	Convert	238	—	—	7,915
2026-05-15	Shaff Eric D.	Director	Convert	391	—	—	1,173
2026-05-15	Brady Kelly	See Remarks	Convert	180	—	—	8,621
2026-05-15	DesRosier Thomas	See Remarks	Convert	133	—	—	398
2026-05-15	Henn Matthew R	See Remarks	Convert	97	—	—	683
2026-05-15	Henn Matthew R	See Remarks	Convert	141	—	—	422
2026-03-04	Henn Matthew R	See Remarks	Award	75,000	—	—	75,000
2026-03-04	DesRosier Thomas	See Remarks	Award	22,500	—	—	22,500
2026-03-04	Kender Richard N	Director	Award	150,000	—	—	150,000
2026-03-04	Thorell Marella	See Remarks	Award	22,500	—	—	22,500
2026-03-04	Brady Kelly	See Remarks	Award	56,250	—	—	56,250
2026-03-02	Brady Kelly	See Remarks	Other	0	—	—	0
2026-03-02	Brady Kelly	See Remarks	Other	0	—	—	0
2026-03-02	Brady Kelly	See Remarks	Other	0	—	—	0
2026-03-02	Brady Kelly	See Remarks	Other	0	—	—	0
2026-03-02	Brady Kelly	See Remarks	Other	0	—	—	0
2026-03-02	Brady Kelly	See Remarks	Other	8,441	—	—	8,441
2026-03-02	Brady Kelly	See Remarks	Other	0	—	—	0
2026-03-02	Brady Kelly	See Remarks	Other	0	—	—	0
2026-03-02	Brady Kelly	See Remarks	Other	0	—	—	0
2026-03-02	Brady Kelly	See Remarks	Other	0	—	—	0
2026-02-15	Young Teresa L.	See Remarks	Convert	231	—	—	8,632
2026-02-15	Young Teresa L.	See Remarks	Convert	133	—	—	531
2026-02-15	DesRosier Thomas	See Remarks	Sell	78	$8.47	$661	7,789
2026-02-15	Shaff Eric D.	Director	Sell	259	$8.47	$2,194	11,577
2026-02-15	Henn Matthew R	See Remarks	Convert	141	—	—	563
2026-02-15	DesRosier Thomas	See Remarks	Convert	111	—	—	890
2026-02-15	Shaff Eric D.	Director	Convert	391	—	—	1,564
2026-02-15	Shaff Eric D.	Director	Convert	723	—	—	11,836
2026-02-15	Young Teresa L.	See Remarks	Sell	75	$8.47	$635	8,557
2026-02-15	Young Teresa L.	See Remarks	Convert	98	—	—	780
2026-02-15	Henn Matthew R	See Remarks	Convert	239	—	—	7,766
2026-02-15	Shaff Eric D.	Director	Convert	333	—	—	2,656
2026-02-15	DesRosier Thomas	See Remarks	Convert	133	—	—	531
2026-02-15	DesRosier Thomas	See Remarks	Convert	244	—	—	7,867
2026-02-15	Henn Matthew R	See Remarks	Sell	89	$8.47	$754	7,677
2026-02-15	Henn Matthew R	See Remarks	Convert	98	—	—	780
2025-11-15	Shaff Eric D.	Director	Convert	331	—	—	2,989
2025-11-15	Young Teresa L.	See Remarks	Convert	132	—	—	664
2025-11-15	DesRosier Thomas	See Remarks	Convert	132	—	—	7,587

Showing 1–50 of 461 transactions