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The company

Seres Therapeutics, Inc.

MCRB · Nasdaq

Health CareBiotechnologyNot moving yet

MCRB stood above a rising 150-day average in 9 of the last 52 weekly readings, and has been out of that trend for the last 40 weeks. It is 60.9% below that average now. Biotechnology: 16% of its 561 stocks in an uptrend (−15 points in four weeks); Health Care: 26% (−10 points in four weeks).

SEC filings

Statistics

Rotation: Not moving yet
Weeks in an uptrend: out for 40
Industry in uptrend: 16% -15 in 4 wk
Insider buys, 12 months: $0
Insider sales, 12 months: $65K
Officials’ trades on record: 0
Institutions holding: 37 (+4)

In the rotation

Each square a week: lit when it closed above a rising 150-day average. 9 of 52 weeks.

20 Apr – 19 Oct

Biotechnology: Few of its stocks are in an uptrend and the share has fallen sharply over four weeks. Health Care: A minority of its stocks are in an uptrend and the share has fallen sharply over four weeks.

Money in and out

1 Nov 2024 – 1 Oct 2026

Open-market buys above the line and sales below, in dollars.

Congress and officials

No member of Congress or official has disclosed a trade in it.

Insiders

Buy orders, 12 months0

Sale orders, 12 months16

Buyers · sellers0 · 5

Who	Did	Shares	Traded
Thomas DesrosierOfficer	sold	82at $4.55	17 Aug 2026filed 18 Aug 2026
Matthew R. HennOfficer	sold	81at $4.55	17 Aug 2026filed 18 Aug 2026
Eric D. ShaffDirector	sold	263at $4.55	17 Aug 2026filed 18 Aug 2026
Kelly BradyOfficer	sold	64at $4.55	17 Aug 2026filed 18 Aug 2026
Matthew R. HennOfficer	sold	77at $7.53	18 May 2026filed 19 May 2026
Thomas DesrosierOfficer	sold	79at $7.53	18 May 2026filed 19 May 2026
Kelly BradyOfficer	sold	59at $7.53	18 May 2026filed 19 May 2026
Eric D. ShaffDirector	sold	259at $7.53	18 May 2026filed 19 May 2026
Matthew R. HennOfficer	sold	89at $8.47	15 Feb 2026filed 18 Feb 2026
Thomas DesrosierOfficer	sold	78at $8.47	15 Feb 2026filed 18 Feb 2026
Eric D. ShaffDirector	sold	259at $8.47	15 Feb 2026filed 18 Feb 2026
Teresa L. YoungOfficer	sold	75at $8.47	15 Feb 2026filed 18 Feb 2026

Lines filed since 2 January 2026, newest first; every insider’s older lines are on their own page.

Institutions

Holders37+4 on the quarter

New · exited10 · 5

Reported value$18.2M

Quarter to 30 Jun 2026, against 31 Mar 2026; newest filing 31 Aug 2026.

Manager	Shares	Change
Flagship Pioneering, LLCunchanged · filed 14 Aug 2026	1,155,850$9.1M	00.0%
VANGUARD CAPITAL MANAGEMENT LLCreduced · filed 13 Aug 2026	287,776$2.3M	-6,367−2.2%
MARSHALL WACE, LLPadded · filed 13 Aug 2026	172,245$1.4M	+32,706+23.4%
Vontobel Holding Ltd.reduced · filed 3 Aug 2026	122,975$970K	-15,493−11.2%
BlackRock, Inc.added · filed 7 Aug 2026	111,000$876K	+8,974+8.8%
GEODE CAPITAL MANAGEMENT, LLCadded · filed 12 Aug 2026	79,974$631K	+5,139+6.9%
SUSQUEHANNA INTERNATIONAL GROUP, LLPreduced · filed 14 Aug 2026	58,328$460K	-47,011−44.6%
VANGUARD FIDUCIARY TRUST COadded · filed 13 Aug 2026	48,685$384K	+9,042+22.8%
STATE STREET CORPunchanged · filed 7 Aug 2026	33,901$267K	00.0%
Lion Point Capital, LPunchanged · filed 14 Aug 2026	31,570$249K	00.0%