MCRB

Seres Therapeutics, Inc.

Insider trading activity for Seres Therapeutics, Inc., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

-$2.2K

net selling

Bought(0 · 0 insiders): $0
Sold(4 · 4 insiders): $2.2K

Past 6 months

-$5.8K

net selling

Bought(0 · 0 insiders): $0
Sold(8 · 4 insiders): $5.8K

Past 12 months

-$54.9K

net selling

Bought(0 · 0 insiders): $0
Sold(16 · 5 insiders): $54.9K

Transaction history

The 100 most recent Form 4 transactions.

Open in screener →

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Aug 17	Brady Kelly	See Remarks	SSELL◷	64	$4.55	$291	-0.7%	Open the original filing on SEC.gov
Aug 17	Henn Matthew R	See Remarks	SSELL◷	81	$4.55	$369	-1.0%	Open the original filing on SEC.gov
Aug 17	Shaff Eric D.	Director	SSELL◷	263	$4.55	$1.2K	-2.1%	Open the original filing on SEC.gov
Aug 17	DesRosier Thomas	See Remarks	SSELL◷	82	$4.55	$373	-1.0%	Open the original filing on SEC.gov
Aug 15	Brady Kelly	See Remarks	MEXER◷◆	91	—	—	—	Open the original filing on SEC.gov
Aug 15	Brady Kelly	See Remarks	MEXER◷◆	90	—	—	—	Open the original filing on SEC.gov
Aug 15	Brady Kelly	See Remarks	MEXER◷	181	—	—	+2.1%	Open the original filing on SEC.gov
Aug 15	Henn Matthew R	See Remarks	MEXER◷◆	98	—	—	—	Open the original filing on SEC.gov
Aug 15	Henn Matthew R	See Remarks	MEXER◷◆	140	—	—	—	Open the original filing on SEC.gov
Aug 15	Henn Matthew R	See Remarks	MEXER◷	238	—	—	+3.0%	Open the original filing on SEC.gov
Aug 15	Shaff Eric D.	Director	MEXER◷◆	332	—	—	—	Open the original filing on SEC.gov
Aug 15	Shaff Eric D.	Director	MEXER◷◆	390	—	—	—	Open the original filing on SEC.gov
Aug 15	Shaff Eric D.	Director	MEXER◷	722	—	—	+6.0%	Open the original filing on SEC.gov
Aug 15	DesRosier Thomas	See Remarks	MEXER◷◆	112	—	—	—	Open the original filing on SEC.gov
Aug 15	DesRosier Thomas	See Remarks	MEXER◷◆	133	—	—	—	Open the original filing on SEC.gov
Aug 15	DesRosier Thomas	See Remarks	MEXER◷	245	—	—	+3.1%	Open the original filing on SEC.gov
Jul 8	Thorell Marella	See Remarks	AGRANT◆	7,500	—	—	—	Open the original filing on SEC.gov
Jul 8	Shaff Eric D.	Director	AGRANT◆	6,500	—	—	—	Open the original filing on SEC.gov
Jul 8	Rosiello Robert L.	Director	AGRANT◆	6,500	—	—	—	Open the original filing on SEC.gov
Jul 8	Kender Richard N	See Remarks	AGRANT◆	50,000	—	—	—	Open the original filing on SEC.gov
Jul 8	Henn Matthew R	See Remarks	AGRANT◆	25,000	—	—	—	Open the original filing on SEC.gov
Jul 8	Graves Kurt	Director	AGRANT◆	6,500	—	—	—	Open the original filing on SEC.gov
Jul 8	Fraser Claire	Director	AGRANT◆	6,500	—	—	—	Open the original filing on SEC.gov
Jul 8	DesRosier Thomas	See Remarks	AGRANT◆	7,500	—	—	—	Open the original filing on SEC.gov
Jul 8	Dere Willard H	Director	AGRANT◆	6,500	—	—	—	Open the original filing on SEC.gov
Jul 8	Brady Kelly	See Remarks	AGRANT◆	18,750	—	—	—	Open the original filing on SEC.gov
Jul 8	Berenson Stephen	Director	AGRANT◆	6,500	—	—	—	Open the original filing on SEC.gov
Jul 8	Ausiello Dennis A	Director	AGRANT◆	6,500	—	—	—	Open the original filing on SEC.gov
Jul 1	Rosiello Robert L.	Director	AGRANT◆	7,508	—	—	—	Open the original filing on SEC.gov
Jul 1	Berenson Stephen	Director	AGRANT◆	7,508	—	—	—	Open the original filing on SEC.gov
Jul 1	Ausiello Dennis A	Director	AGRANT◆	7,508	—	—	—	Open the original filing on SEC.gov
May 18	Shaff Eric D.	Director	SSELL◷	259	$7.53	$2K	-2.1%	Open the original filing on SEC.gov
May 18	Henn Matthew R	See Remarks	SSELL◷	77	$7.53	$580	-1.0%	Open the original filing on SEC.gov
May 18	DesRosier Thomas	See Remarks	SSELL◷	79	$7.53	$595	-1.0%	Open the original filing on SEC.gov
May 18	Brady Kelly	See Remarks	SSELL	59	$7.53	$444	-0.7%	Open the original filing on SEC.gov
May 15	Shaff Eric D.	Director	MEXER◷◆	331	—	—	—	Open the original filing on SEC.gov
May 15	Shaff Eric D.	Director	MEXER◷◆	391	—	—	—	Open the original filing on SEC.gov
May 15	Shaff Eric D.	Director	MEXER◷	722	—	—	+6.2%	Open the original filing on SEC.gov
May 15	Henn Matthew R	See Remarks	MEXER◷◆	97	—	—	—	Open the original filing on SEC.gov
May 15	Henn Matthew R	See Remarks	MEXER◷◆	141	—	—	—	Open the original filing on SEC.gov
May 15	Henn Matthew R	See Remarks	MEXER◷	238	—	—	+3.1%	Open the original filing on SEC.gov
May 15	DesRosier Thomas	See Remarks	MEXER◷◆	111	—	—	—	Open the original filing on SEC.gov
May 15	DesRosier Thomas	See Remarks	MEXER◷◆	133	—	—	—	Open the original filing on SEC.gov
May 15	DesRosier Thomas	See Remarks	MEXER◷	244	—	—	+3.1%	Open the original filing on SEC.gov
May 15	Brady Kelly	See Remarks	MEXER◆	91	—	—	—	Open the original filing on SEC.gov
May 15	Brady Kelly	See Remarks	MEXER◆	89	—	—	—	Open the original filing on SEC.gov
May 15	Brady Kelly	See Remarks	MEXER	180	—	—	+2.1%	Open the original filing on SEC.gov
Mar 4	Thorell Marella	See Remarks	AGRANT◆	22,500	—	—	—	Open the original filing on SEC.gov
Mar 4	Kender Richard N	See Remarks	AGRANT◆	150,000	—	—	—	Open the original filing on SEC.gov
Mar 4	Henn Matthew R	See Remarks	AGRANT◆	75,000	—	—	—	Open the original filing on SEC.gov
Mar 4	DesRosier Thomas	See Remarks	AGRANT◆	22,500	—	—	—	Open the original filing on SEC.gov
Mar 4	Brady Kelly	See Remarks	AGRANT◆	56,250	—	—	—	Open the original filing on SEC.gov
Feb 15	Young Teresa L.	See Remarks	MEXER◷◆	98	—	—	—	Open the original filing on SEC.gov
Feb 15	Young Teresa L.	See Remarks	MEXER◷◆	133	—	—	—	Open the original filing on SEC.gov
Feb 15	Young Teresa L.	See Remarks	SSELL◷	75	$8.47	$635	-0.9%	Open the original filing on SEC.gov
Feb 15	Young Teresa L.	See Remarks	MEXER◷	231	—	—	+2.8%	Open the original filing on SEC.gov
Feb 15	Shaff Eric D.	Director	MEXER◷◆	333	—	—	—	Open the original filing on SEC.gov
Feb 15	Shaff Eric D.	Director	MEXER◷◆	391	—	—	—	Open the original filing on SEC.gov
Feb 15	Shaff Eric D.	Director	SSELL◷	259	$8.47	$2.2K	-2.2%	Open the original filing on SEC.gov
Feb 15	Shaff Eric D.	Director	MEXER◷	723	—	—	+6.5%	Open the original filing on SEC.gov
Feb 15	Henn Matthew R	See Remarks	MEXER◷◆	98	—	—	—	Open the original filing on SEC.gov
Feb 15	Henn Matthew R	See Remarks	MEXER◷◆	141	—	—	—	Open the original filing on SEC.gov
Feb 15	Henn Matthew R	See Remarks	SSELL◷	89	$8.47	$754	-1.1%	Open the original filing on SEC.gov
Feb 15	Henn Matthew R	See Remarks	MEXER◷	239	—	—	+3.2%	Open the original filing on SEC.gov
Feb 15	DesRosier Thomas	See Remarks	MEXER◷◆	111	—	—	—	Open the original filing on SEC.gov
Feb 15	DesRosier Thomas	See Remarks	MEXER◷◆	133	—	—	—	Open the original filing on SEC.gov
Feb 15	DesRosier Thomas	See Remarks	SSELL◷	78	$8.47	$661	-1.0%	Open the original filing on SEC.gov
Feb 15	DesRosier Thomas	See Remarks	MEXER◷	244	—	—	+3.2%	Open the original filing on SEC.gov
Nov 15, 2025	Young Teresa L.	See Remarks	MEXER◷◆	98	—	—	—	Open the original filing on SEC.gov
Nov 15, 2025	Young Teresa L.	See Remarks	MEXER◷◆	132	—	—	—	Open the original filing on SEC.gov
Nov 15, 2025	Young Teresa L.	See Remarks	MEXER◷◆	3,998	—	—	—	Open the original filing on SEC.gov
Nov 15, 2025	Young Teresa L.	See Remarks	SSELL◷	1,042	$17.30	$18K	-11.0%	Open the original filing on SEC.gov
Nov 15, 2025	Young Teresa L.	See Remarks	MEXER◷	98	—	—	+1.1%	Open the original filing on SEC.gov
Nov 15, 2025	Young Teresa L.	See Remarks	MEXER◷	132	—	—	+1.4%	Open the original filing on SEC.gov
Nov 15, 2025	Young Teresa L.	See Remarks	MEXER◷	3,998	—	—	+76.7%	Open the original filing on SEC.gov
Nov 15, 2025	Shaff Eric D.	Director	MEXER◷◆	331	—	—	—	Open the original filing on SEC.gov
Nov 15, 2025	Shaff Eric D.	Director	MEXER◷◆	390	—	—	—	Open the original filing on SEC.gov
Nov 15, 2025	Shaff Eric D.	Director	SSELL◷	217	$17.30	$3.8K	-1.9%	Open the original filing on SEC.gov
Nov 15, 2025	Shaff Eric D.	Director	MEXER◷	331	—	—	+3.0%	Open the original filing on SEC.gov
Nov 15, 2025	Shaff Eric D.	Director	MEXER◷	390	—	—	+3.7%	Open the original filing on SEC.gov
Nov 15, 2025	Henn Matthew R	See Remarks	MEXER◷◆	98	—	—	—	Open the original filing on SEC.gov
Nov 15, 2025	Henn Matthew R	See Remarks	MEXER◷◆	140	—	—	—	Open the original filing on SEC.gov
Nov 15, 2025	Henn Matthew R	See Remarks	MEXER◷◆	3,998	—	—	—	Open the original filing on SEC.gov
Nov 15, 2025	Henn Matthew R	See Remarks	SSELL◷	1,257	$17.30	$21.7K	-14.3%	Open the original filing on SEC.gov
Nov 15, 2025	Henn Matthew R	See Remarks	MEXER◷	98	—	—	+1.1%	Open the original filing on SEC.gov
Nov 15, 2025	Henn Matthew R	See Remarks	MEXER◷	140	—	—	+1.6%	Open the original filing on SEC.gov
Nov 15, 2025	Henn Matthew R	See Remarks	MEXER◷	3,998	—	—	+87.9%	Open the original filing on SEC.gov
Nov 15, 2025	DesRosier Thomas	See Remarks	MEXER◷◆	112	—	—	—	Open the original filing on SEC.gov
Nov 15, 2025	DesRosier Thomas	See Remarks	MEXER◷◆	132	—	—	—	Open the original filing on SEC.gov
Nov 15, 2025	DesRosier Thomas	See Remarks	SSELL◷	76	$17.30	$1.3K	-1.0%	Open the original filing on SEC.gov
Nov 15, 2025	DesRosier Thomas	See Remarks	MEXER◷	112	—	—	+1.5%	Open the original filing on SEC.gov
Nov 15, 2025	DesRosier Thomas	See Remarks	MEXER◷	132	—	—	+1.8%	Open the original filing on SEC.gov
Sep 26, 2025	Young Teresa L.	See Remarks	AGRANT◆	3,998	—	—	—	Open the original filing on SEC.gov
Sep 26, 2025	Henn Matthew R	See Remarks	AGRANT◆	3,998	—	—	—	Open the original filing on SEC.gov
Aug 18, 2025	Young Teresa L.	See Remarks	SSELL◷	59	$16.65	$982	-1.1%	Open the original filing on SEC.gov
Aug 18, 2025	Shaff Eric D.	Director	SSELL◷	217	$16.65	$3.6K	-2.0%	Open the original filing on SEC.gov
Aug 18, 2025	Henn Matthew R	See Remarks	SSELL◷	73	$16.65	$1.2K	-1.6%	Open the original filing on SEC.gov
Aug 18, 2025	DesRosier Thomas	See Remarks	SSELL◷	76	$16.65	$1.3K	-1.0%	Open the original filing on SEC.gov
Aug 15, 2025	Young Teresa L.	See Remarks	MEXER◷◆	97	—	—	—	Open the original filing on SEC.gov
Aug 15, 2025	Young Teresa L.	See Remarks	MEXER◷◆	133	—	—	—	Open the original filing on SEC.gov

SSELL◷$291

Brady Kelly · See RemarksAug 17

64 sh @ $4.55 · -0.7% own

SSELL◷$369

Henn Matthew R · See RemarksAug 17

81 sh @ $4.55 · -1.0% own

SSELL◷$1.2K

Shaff Eric D. · DirectorAug 17

263 sh @ $4.55 · -2.1% own

SSELL◷$373

DesRosier Thomas · See RemarksAug 17

82 sh @ $4.55 · -1.0% own

MEXER◷◆—

Brady Kelly · See RemarksAug 15

91 sh

MEXER◷◆—

Brady Kelly · See RemarksAug 15

90 sh

MEXER◷—

Brady Kelly · See RemarksAug 15

181 sh · +2.1% own

MEXER◷◆—

Henn Matthew R · See RemarksAug 15

98 sh

MEXER◷◆—

Henn Matthew R · See RemarksAug 15

140 sh

MEXER◷—

Henn Matthew R · See RemarksAug 15

238 sh · +3.0% own

MEXER◷◆—

Shaff Eric D. · DirectorAug 15

332 sh

MEXER◷◆—

Shaff Eric D. · DirectorAug 15

390 sh

MEXER◷—

Shaff Eric D. · DirectorAug 15

722 sh · +6.0% own

MEXER◷◆—

DesRosier Thomas · See RemarksAug 15

112 sh

MEXER◷◆—

DesRosier Thomas · See RemarksAug 15

133 sh

MEXER◷—

DesRosier Thomas · See RemarksAug 15

245 sh · +3.1% own

AGRANT◆—

Thorell Marella · See RemarksJul 8

7,500 sh

AGRANT◆—

Shaff Eric D. · DirectorJul 8

6,500 sh

AGRANT◆—

Rosiello Robert L. · DirectorJul 8

6,500 sh

AGRANT◆—

Kender Richard N · See RemarksJul 8

50,000 sh

AGRANT◆—

Henn Matthew R · See RemarksJul 8

25,000 sh

AGRANT◆—

Graves Kurt · DirectorJul 8

6,500 sh

AGRANT◆—

Fraser Claire · DirectorJul 8

6,500 sh

AGRANT◆—

DesRosier Thomas · See RemarksJul 8

7,500 sh

AGRANT◆—

Dere Willard H · DirectorJul 8

6,500 sh

AGRANT◆—

Brady Kelly · See RemarksJul 8

18,750 sh

AGRANT◆—

Berenson Stephen · DirectorJul 8

6,500 sh

AGRANT◆—

Ausiello Dennis A · DirectorJul 8

6,500 sh

AGRANT◆—

Rosiello Robert L. · DirectorJul 1

7,508 sh

AGRANT◆—

Berenson Stephen · DirectorJul 1

7,508 sh

AGRANT◆—

Ausiello Dennis A · DirectorJul 1

7,508 sh

SSELL◷$2K

Shaff Eric D. · DirectorMay 18

259 sh @ $7.53 · -2.1% own

SSELL◷$580

Henn Matthew R · See RemarksMay 18

77 sh @ $7.53 · -1.0% own

SSELL◷$595

DesRosier Thomas · See RemarksMay 18

79 sh @ $7.53 · -1.0% own

SSELL$444

Brady Kelly · See RemarksMay 18

59 sh @ $7.53 · -0.7% own

MEXER◷◆—

Shaff Eric D. · DirectorMay 15

331 sh

MEXER◷◆—

Shaff Eric D. · DirectorMay 15

391 sh

MEXER◷—

Shaff Eric D. · DirectorMay 15

722 sh · +6.2% own

MEXER◷◆—

Henn Matthew R · See RemarksMay 15

97 sh

MEXER◷◆—

Henn Matthew R · See RemarksMay 15

141 sh

MEXER◷—

Henn Matthew R · See RemarksMay 15

238 sh · +3.1% own

MEXER◷◆—

DesRosier Thomas · See RemarksMay 15

111 sh

MEXER◷◆—

DesRosier Thomas · See RemarksMay 15

133 sh

MEXER◷—

DesRosier Thomas · See RemarksMay 15

244 sh · +3.1% own

MEXER◆—

Brady Kelly · See RemarksMay 15

91 sh

MEXER◆—

Brady Kelly · See RemarksMay 15

89 sh

MEXER—

Brady Kelly · See RemarksMay 15

180 sh · +2.1% own

AGRANT◆—

Thorell Marella · See RemarksMar 4

22,500 sh

AGRANT◆—

Kender Richard N · See RemarksMar 4

150,000 sh

AGRANT◆—

Henn Matthew R · See RemarksMar 4

75,000 sh

AGRANT◆—

DesRosier Thomas · See RemarksMar 4

22,500 sh

AGRANT◆—

Brady Kelly · See RemarksMar 4

56,250 sh

MEXER◷◆—

Young Teresa L. · See RemarksFeb 15

98 sh

MEXER◷◆—

Young Teresa L. · See RemarksFeb 15

133 sh

SSELL◷$635

Young Teresa L. · See RemarksFeb 15

75 sh @ $8.47 · -0.9% own

MEXER◷—

Young Teresa L. · See RemarksFeb 15

231 sh · +2.8% own

MEXER◷◆—

Shaff Eric D. · DirectorFeb 15

333 sh

MEXER◷◆—

Shaff Eric D. · DirectorFeb 15

391 sh

SSELL◷$2.2K

Shaff Eric D. · DirectorFeb 15

259 sh @ $8.47 · -2.2% own

MEXER◷—

Shaff Eric D. · DirectorFeb 15

723 sh · +6.5% own

MEXER◷◆—

Henn Matthew R · See RemarksFeb 15

98 sh

MEXER◷◆—

Henn Matthew R · See RemarksFeb 15

141 sh

SSELL◷$754

Henn Matthew R · See RemarksFeb 15

89 sh @ $8.47 · -1.1% own

MEXER◷—

Henn Matthew R · See RemarksFeb 15

239 sh · +3.2% own

MEXER◷◆—

DesRosier Thomas · See RemarksFeb 15

111 sh

MEXER◷◆—

DesRosier Thomas · See RemarksFeb 15

133 sh

SSELL◷$661

DesRosier Thomas · See RemarksFeb 15

78 sh @ $8.47 · -1.0% own

MEXER◷—

DesRosier Thomas · See RemarksFeb 15

244 sh · +3.2% own

MEXER◷◆—

Young Teresa L. · See RemarksNov 15, 2025

98 sh

MEXER◷◆—

Young Teresa L. · See RemarksNov 15, 2025

132 sh

MEXER◷◆—

Young Teresa L. · See RemarksNov 15, 2025

3,998 sh

SSELL◷$18K

Young Teresa L. · See RemarksNov 15, 2025

1,042 sh @ $17.30 · -11.0% own

MEXER◷—

Young Teresa L. · See RemarksNov 15, 2025

98 sh · +1.1% own

MEXER◷—

Young Teresa L. · See RemarksNov 15, 2025

132 sh · +1.4% own

MEXER◷—

Young Teresa L. · See RemarksNov 15, 2025

3,998 sh · +76.7% own

MEXER◷◆—

Shaff Eric D. · DirectorNov 15, 2025

331 sh

MEXER◷◆—

Shaff Eric D. · DirectorNov 15, 2025

390 sh

SSELL◷$3.8K

Shaff Eric D. · DirectorNov 15, 2025

217 sh @ $17.30 · -1.9% own

MEXER◷—

Shaff Eric D. · DirectorNov 15, 2025

331 sh · +3.0% own

MEXER◷—

Shaff Eric D. · DirectorNov 15, 2025

390 sh · +3.7% own

MEXER◷◆—

Henn Matthew R · See RemarksNov 15, 2025

98 sh

MEXER◷◆—

Henn Matthew R · See RemarksNov 15, 2025

140 sh

MEXER◷◆—

Henn Matthew R · See RemarksNov 15, 2025

3,998 sh

SSELL◷$21.7K

Henn Matthew R · See RemarksNov 15, 2025

1,257 sh @ $17.30 · -14.3% own

MEXER◷—

Henn Matthew R · See RemarksNov 15, 2025

98 sh · +1.1% own

MEXER◷—

Henn Matthew R · See RemarksNov 15, 2025

140 sh · +1.6% own

MEXER◷—

Henn Matthew R · See RemarksNov 15, 2025

3,998 sh · +87.9% own

MEXER◷◆—

DesRosier Thomas · See RemarksNov 15, 2025

112 sh

MEXER◷◆—

DesRosier Thomas · See RemarksNov 15, 2025

132 sh

SSELL◷$1.3K

DesRosier Thomas · See RemarksNov 15, 2025

76 sh @ $17.30 · -1.0% own

MEXER◷—

DesRosier Thomas · See RemarksNov 15, 2025

112 sh · +1.5% own

MEXER◷—

DesRosier Thomas · See RemarksNov 15, 2025

132 sh · +1.8% own

AGRANT◆—

Young Teresa L. · See RemarksSep 26, 2025

3,998 sh

AGRANT◆—

Henn Matthew R · See RemarksSep 26, 2025

3,998 sh

SSELL◷$982

Young Teresa L. · See RemarksAug 18, 2025

59 sh @ $16.65 · -1.1% own

SSELL◷$3.6K

Shaff Eric D. · DirectorAug 18, 2025

217 sh @ $16.65 · -2.0% own

SSELL◷$1.2K

Henn Matthew R · See RemarksAug 18, 2025

73 sh @ $16.65 · -1.6% own

SSELL◷$1.3K

DesRosier Thomas · See RemarksAug 18, 2025

76 sh @ $16.65 · -1.0% own

MEXER◷◆—

Young Teresa L. · See RemarksAug 15, 2025

97 sh

MEXER◷◆—

Young Teresa L. · See RemarksAug 15, 2025

133 sh

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

1 of 57 filings we hold was filed after the two-business-day deadline. The furthest past the deadline was 2 business days late.

Form 4 filings made after the two-business-day deadline, with the transaction date, the filing date and the number of business days between them.
Traded	Filed	Insider	Past deadline	Largest line	Source
Mar 4	Mar 10	Brady KellySee Remarks	2days	—	Filing ↗

Brady KellySee Remarks

2days

Traded Mar 4 · filed Mar 10Filing ↗

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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