What does CUSIP 81750R201 represent in this 13F holders report?

CUSIP 81750R201 is the security identifier for MCRB - Seres Therapeutics, Inc. - COMMON STOCK used to aggregate holder disclosures.

How many institutions held MCRB - Seres Therapeutics, Inc. - COMMON STOCK in Q4 2025?

35 institutional investors reported MCRB - Seres Therapeutics, Inc. - COMMON STOCK for Q4 2025. Use the holders table for investor-level position and value details.

Seres Therapeutics, Inc. - COMMON STOCK (MCRB)

CUSIP: 81750R201

Q4 2025 13F Holders as of 31 Dec 2025

Type / Class: Equity / COMMON STOCK
Shares outstanding: 8,667,871
Total 13F shares: 2,441,565
Share change: +313,685
Total reported value: $36,368,373
Put/Call ratio: 73%
Price per share: $14.88
Number of holders: 35
Value change: +$4,536,402
Number of buys: 21
Number of sells: 12

Security key

81750R201

Report period

Q4 2025

Institutions

Top holders

MCRB full security history Ownership snapshot Full 13F holder table Newer quarter: Q1 2026 Previous quarter: Q3 2025 Seres Therapeutics, Inc. SEC filings Seres Therapeutics, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 81750R201

Newer quarter: Q1 2026 Previous quarter: Q3 2025

Recent filing periods:

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025

Ownership snapshot

Top shareholders of MCRB - Seres Therapeutics, Inc. - COMMON STOCK (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Lead holder

FMR LLC

13D/G signal

FMR LLC

Evidence rows

Latest as of

30 Sep 2025

13D/G 13F 3/4/5 Lead comparable stake: 3.1% 13D/G row: FMR LLC Showing first 8 of 49 holder rows. Open remaining rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
FMR LLC	13D/G 13F Company 13D/G 13F	3.1%	$3,377,609 268,704 shares	-$2,827,043	30 Jun 2025
Flagship Pioneering, LLC	13F Company 13F	13%	$22,238,554 1,155,850 shares	—	30 Sep 2025
VANGUARD GROUP INC	13F Company 13F	3.6%	$6,000,745 311,889 shares	—	30 Sep 2025
MARSHALL WACE, LLP	13F Company 13F	1.4%	$2,416,543 125,600 shares	—	30 Sep 2025
BlackRock, Inc.	13F Company 13F	1.2%	$1,963,635 102,060 shares	—	30 Sep 2025
Vontobel Holding Ltd.	13F Company 13F	1.1%	$1,895,352 98,511 shares	—	30 Sep 2025
GEODE CAPITAL MANAGEMENT, LLC	13F Company 13F	0.98%	$1,635,753 84,982 shares	—	30 Sep 2025
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F Company 13F	0.36%	$604,194 31,403 shares	—	30 Sep 2025

Show 41 additional holder rows in the full holder list

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
CITADEL ADVISORS LLC	13F Company 13F	0.36%	$594,227 30,885 shares	—	30 Sep 2025
STATE STREET CORP	13F Company 13F	0.34%	$572,024 29,731 shares	—	30 Sep 2025
Schonfeld Strategic Advisors LLC	13F Company 13F	0.33%	$556,843 28,942 shares	—	30 Sep 2025
Lion Point Capital, LP	13F Company 13F	0.31%	$522,135 27,138 shares	—	30 Sep 2025
J. Goldman & Co LP	13F Company 13F	0.31%	$519,480 27,000 shares	—	30 Sep 2025
MORGAN STANLEY	13F Company 13F	0.21%	$352,746 18,334 shares	—	30 Sep 2025
UBS Group AG	13F Company 13F	0.15%	$244,002 12,682 shares	—	30 Sep 2025
NORTHERN TRUST CORP	13F Company 13F	0.14%	$232,824 12,101 shares	—	30 Sep 2025
Invesco Ltd.	13F Company 13F	0.12%	$200,904 10,442 shares	—	30 Sep 2025
BANK OF AMERICA CORP /DE/	13F Company 13F	0.06%	$102,799 5,343 shares	—	30 Sep 2025
SBI Securities Co., Ltd.	13F Company 13F	0.04%	$66,994 3,482 shares	—	30 Sep 2025
SIMPLEX TRADING, LLC	13F Company 13F	0.03%	$54,000 2,807 shares	—	30 Sep 2025
CITIGROUP INC	13F Company 13F	0.03%	$50,428 2,621 shares	—	30 Sep 2025
BARCLAYS PLC	13F Company 13F	0.02%	$27,090 1,408 shares	—	30 Sep 2025
ROYAL BANK OF CANADA	13F Company 13F	0%	$6,000 287 shares	—	30 Sep 2025
BNP PARIBAS FINANCIAL MARKETS	13F Company 13F	0%	$4,079 212 shares	—	30 Sep 2025
Physician Wealth Advisors, Inc.	13F Company 13F	0%	$2,733 142 shares	—	30 Sep 2025
JPMORGAN CHASE & CO	13F Company 13F	0%	$1,251 65 shares	—	30 Sep 2025
US BANCORP \DE\	13F Company 13F	0%	$231 12 shares	—	30 Sep 2025
WELLS FARGO & COMPANY/MN	13F Company 13F	0%	$192 10 shares	—	30 Sep 2025
Sound Income Strategies, LLC	13F Company 13F	0%	$156 8 shares	—	30 Sep 2025
OSAIC HOLDINGS, INC.	13F Company 13F	0%	$151 8 shares	—	30 Sep 2025
Federation Des Caisses Desjardins du Quebec	13F Individual 13F	0%	$58 3 shares	—	30 Sep 2025
Arax Advisory Partners	13F Company 13F	0%	$38 2 shares	—	30 Sep 2025
Nutritional Health LTP Fund General Partner LLC	3/4/5 10%+ Owner 3/4/5	— class O/S missing	$31,715,635 23,493,063 shares	—	05 Jul 2022
NESTLE SA	3/4/5 10%+ Owner 3/4/5	— class O/S missing	$18,378,993 21,879,753 shares	—	30 Sep 2024
Flagship Pioneering Fund VII General Partner LLC	3/4/5 10%+ Owner 3/4/5	— class O/S missing	$7,864,418 5,825,495 shares	—	05 Jul 2022
David Arkowitz	3/4/5 Chief Financial Officer 3/4/5	— mixed-class rows	$240,068 502,222 shares mixed-class rows	—	14 Feb 2024
David S. Ege	3/4/5 Executive Vice President and Chief Technology Officer 3/4/5	— mixed-class rows	$97,342 395,168 shares mixed-class rows	—	15 Aug 2024
Paula Cloghessy	3/4/5 Executive Vice President, Chief People Officer 3/4/5	— mixed-class rows	$71,843 150,101 shares mixed-class rows	—	27 Oct 2023
Lisa von Moltke	3/4/5 Executive Vice President and Chief Medical Officer 3/4/5	— mixed-class rows	$46,765 716,593 shares mixed-class rows	—	15 Feb 2025
Meryl Zausner	3/4/5 Director 3/4/5	— class O/S missing	$42,857 31,746 shares	—	05 Jul 2022
Hans-Juergen Woerle	3/4/5 Director 3/4/5	— class O/S missing	— 120,000 shares	—	04 Feb 2025
Kurt Graves	3/4/5 Director 3/4/5	— class O/S missing	— 100,000 shares	—	10 Apr 2025
Paul Biondi	3/4/5 Director 3/4/5	— class O/S missing	— 100,000 shares	—	10 Apr 2025
Willard H. Dere	3/4/5 Director 3/4/5	— class O/S missing	— 100,000 shares	—	10 Apr 2025
Gregory Behar	3/4/5 Director 3/4/5	— class O/S missing	— 35,000 shares	—	22 Jun 2023
Stephen Berenson	3/4/5 Director 3/4/5	— class O/S missing	— 11,470 shares	—	01 Jul 2025
Robert L. Rosiello	3/4/5 Director 3/4/5	— class O/S missing	— 10,000 shares	—	05 Aug 2025
Claire Fraser	3/4/5 Director 3/4/5	— class O/S missing	— 6,452 shares	—	01 Jul 2025
Dennis A. Ausiello	3/4/5 Director 3/4/5	— class O/S missing	— 6,452 shares	—	01 Jul 2025

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q4 2025

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

2,441,565

Rows loaded

Investor	Option	Weight %	Change %	Reported value	* Price	Shares	Share Change	Activity	Report Period

* Reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. An asterisk next to the price means the price is likely invalid.

Compare Q4 2025 vs Q3 2025 Across Filers

Q3 2025 holders

Q4 2025 holders

Holder diff

Investor	Q3 2025 Shares	Q4 2025 Shares	Share Diff	Share Chg %	Q3 2025 value	Q4 2025 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend