Seres Therapeutics Inc.

Last updated September 27, 2026

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Organization details

Legal name: Seres Therapeutics Inc.
Former names: Seres Health, Inc.
Ownership: Public
Status: Active
Sector (GICS): Health Care
SIC code: 2834 — Pharmaceutical Preparations
Jurisdiction of incorporation: Delaware
Headquarters city: Cambridge
Headquarters state / province: Massachusetts
Headquarters country: United States
Fiscal year end: December
Ticker symbol: MCRB
Primary stock exchange: Nasdaq

Identifiers

SEC CIK: 0001609809
EIN: 27-4326290

Board of directors

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Claire Fraser · Director
Since 2023
Dennis A. Ausiello · Director
Since 2023
Eric D. Shaff · Director · CEO and President
Since 2023
Gregory Behar · Director
Since 2023
Hans-Juergen Woerle · Director
Since 2025
Kurt Graves · Director
Since 2023
Paul Biondi · Director
Since 2023
Richard N. Kender · Director · See Remarks
Since 2023
Robert L. Rosiello · Director
Since 2025
Stephen Berenson · Director
Since 2023
Willard H. Dere · Director
Since 2023

Chief executives

Eric D. Shaff · CEO and President

Dates unknown

Director election results

Annual meeting of July 8, 2026. Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.

Board connections

6 of this board's directors also sit on 10 other boards. 9 are in the same sector.

Shared director Other board Same sector

Alnylam Pharmaceuticals Inc. Same sector
via Dennis A. Ausiello
Becton Dickinson and Company Same sector
via Claire Fraser
Bicycle Therapeutics plc Same sector
via Richard N. Kender
BioMarin Pharmaceutical Inc. Same sector
via Willard H. Dere
Longeveron Inc. Same sector
via Richard N. Kender
Metagenomi Therapeutics Inc. Same sector
via Willard H. Dere
Moderna Inc. Same sector
via Stephen Berenson
Rani Therapeutics Holdings Inc. Same sector
via Dennis A. Ausiello
Sana Biotechnology Inc. Same sector
via Robert L. Rosiello
Waters Corporation
via Claire Fraser

Insider trades

All notable trades →

From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.

Bought, last 12 months: $0; 0 purchases by 0 insiders
Sold, last 12 months: $54,884; 16 sales by 5 insiders

Date	Insider	Transaction	Shares	Price	Value
Aug 17, 2026	Brady Kelly Officer (See Remarks)	Open-market sale	−64	$4.55	$291
Aug 17, 2026	DesRosier Thomas Officer (See Remarks)	Open-market sale	−82	$4.55	$373
Aug 17, 2026	Henn Matthew R Officer (See Remarks)	Open-market sale	−81	$4.55	$369
Aug 17, 2026	Eric D. Shaff Director	Open-market sale	−263	$4.55	$1,197
Aug 15, 2026	Brady Kelly Officer (See Remarks)	Option exercise	+181	—	—
Aug 15, 2026	DesRosier Thomas Officer (See Remarks)	Option exercise	+245	—	—
Aug 15, 2026	Henn Matthew R Officer (See Remarks)	Option exercise	+238	—	—
Aug 15, 2026	Eric D. Shaff Director	Option exercise	+722	—	—
May 18, 2026	Eric D. Shaff Director	Open-market sale	−259	$7.53	$1,950
May 18, 2026	Brady Kelly Officer (See Remarks)	Open-market sale	−59	$7.53	$444
May 18, 2026	DesRosier Thomas Officer (See Remarks)	Open-market sale	−79	$7.53	$595
May 18, 2026	Henn Matthew R Officer (See Remarks)	Open-market sale	−77	$7.53	$580
May 15, 2026	Eric D. Shaff Director	Option exercise	+722	—	—
May 15, 2026	Brady Kelly Officer (See Remarks)	Option exercise	+180	—	—
May 15, 2026	DesRosier Thomas Officer (See Remarks)	Option exercise	+244	—	—

Peers

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Questions about Seres Therapeutics Inc.

Who is the CEO of Seres Therapeutics Inc.?

Eric D. Shaff is Seres Therapeutics Inc.'s CEO and President.

How many directors are on Seres Therapeutics Inc.'s board?

Seres Therapeutics Inc.'s board has 11 directors: Claire Fraser, Dennis A. Ausiello, Eric D. Shaff, Gregory Behar, Hans-Juergen Woerle, Kurt Graves, Paul Biondi, Richard N. Kender, Robert L. Rosiello, Stephen Berenson and 1 other.

Are Seres Therapeutics Inc. insiders buying or selling shares?

Over the last 12 months, Seres Therapeutics Inc. insiders made no open-market purchases and sold $54,884 of shares in 16 sales on the open market, as reported to the SEC on Forms 4 and 5.

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