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Seres Therapeutics, Inc. (MCRB) institutional ownership

Market cap$139M SectorHealthcare
Funds holding · Q1 2026
28
reported MCRB position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
13 buyers · 15 sellers

Seres Therapeutics, Inc. (MCRB) price and institutional activity

Dates

Q1 2026

$0 bought by 13 investors
American Century Companies IncVontobel Holding Ltd. +11 more
$0 sold by 15 investors
Susquehanna International Group, LLP683 Capital Management, LLC +13 more
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Bought Sold Totals per quarter; hover a bar for the names.

Seres Therapeutics, Inc. (MCRB) institutional activity · 28

Investor Type Est. change Change Δ Own Date
Susquehanna International Group, LLP · Reduced
Change −75K Date Q1 2026
Susquehanna International Group, LLP Reduced· Q1 2026 −75K Q1 2026
683 Capital Management, LLC · Exited
Change −52K Δ Own −100.0% Date Q1 2026
683 Capital Management, LLC Exited· Q1 2026 −52K −100.0% Q1 2026
American Century Companies Inc · Added
Change +46K Date Q1 2026
American Century Companies Inc Added· Q1 2026 +46K Q1 2026
Vontobel Holding Ltd. · Added
Change +35K Date Q1 2026
Vontobel Holding Ltd. Added· Q1 2026 +35K Q1 2026
Citadel Advisors LLC Exited· Q1 2026 −31K −100.0% Q1 2026
Schonfeld Strategic Advisors LLC · Exited
Change −29K Δ Own −100.0% Date Q1 2026
Schonfeld Strategic Advisors LLC Exited· Q1 2026 −29K −100.0% Q1 2026
Marshall Wace, LLP · Added
Change +19K Date Q1 2026
Marshall Wace, LLP Added· Q1 2026 +19K Q1 2026
Omers Administration Corp · Exited
Change −14K Δ Own −100.0% Date Q1 2026
Omers Administration Corp Exited· Q1 2026 −14K −100.0% Q1 2026
Goldman Sachs Group Inc · Exited
Change −14K Δ Own −100.0% Date Q1 2026
Goldman Sachs Group Inc Exited· Q1 2026 −14K −100.0% Q1 2026
Exoduspoint Capital Management, LP · Exited
Change −13K Δ Own −100.0% Date Q1 2026
Exoduspoint Capital Management, LP Exited· Q1 2026 −13K −100.0% Q1 2026
Vanguard · Added
Change +12K Date Q1 2026
Vanguard Added· Q1 2026 +12K Q1 2026
Geode · Reduced
Change −11K Date Q1 2026
Geode Reduced· Q1 2026 −11K Q1 2026
Two Sigma Investments, LP · Reduced
Change −7K Δ Own −27.0% Date Q1 2026
Two Sigma Investments, LP Reduced· Q1 2026 −7K −27.0% Q1 2026
Morgan Stanley · Reduced
Change −3K Date Q1 2026
Morgan Stanley Reduced· Q1 2026 −3K Q1 2026
UBS Group AG · Added
Change +3K Date Q1 2026
UBS Group AG Added· Q1 2026 +3K Q1 2026
Data through Q1 2026 · filed May 15, 2026
15 of 28

Famous investor activity in Seres Therapeutics, Inc. (MCRB)

Seres Therapeutics, Inc. (MCRB) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Graves Kurt · Director Grant (A) 6K
Owned 6K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Graves Kurt Director Grant (A) 6K 6K Jul 8, 2026 Jul 10, 2026
Kender Richard N. · Director Grant (A) 50K
Owned 50K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Kender Richard N. Director Grant (A) 50K 50K Jul 8, 2026 Jul 10, 2026
Henn Matthew R. · Officer Grant (A) 25K
Owned 25K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Henn Matthew R. Officer Grant (A) 25K 25K Jul 8, 2026 Jul 10, 2026
Thorell Marella · Officer Grant (A) 8K
Owned 8K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Thorell Marella Officer Grant (A) 8K 8K Jul 8, 2026 Jul 10, 2026
Fraser Claire · Director Grant (A) 6K
Owned 6K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Fraser Claire Director Grant (A) 6K 6K Jul 8, 2026 Jul 10, 2026
Dere Willard H. · Director Grant (A) 6K
Owned 6K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Dere Willard H. Director Grant (A) 6K 6K Jul 8, 2026 Jul 10, 2026
Ausiello Dennis A. · Director Grant (A) 6K
Owned 6K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Ausiello Dennis A. Director Grant (A) 6K 6K Jul 8, 2026 Jul 10, 2026
Shaff Eric D. · Director Grant (A) 6K
Owned 6K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Shaff Eric D. Director Grant (A) 6K 6K Jul 8, 2026 Jul 10, 2026
Rosiello Robert L. · Director Grant (A) 6K
Owned 6K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Rosiello Robert L. Director Grant (A) 6K 6K Jul 8, 2026 Jul 10, 2026
Berenson Stephen · Director Grant (A) 6K
Owned 6K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Berenson Stephen Director Grant (A) 6K 6K Jul 8, 2026 Jul 10, 2026
Brady Kelly · Officer Grant (A) 19K
Owned 19K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Brady Kelly Officer Grant (A) 19K 19K Jul 8, 2026 Jul 10, 2026
Desrosier Thomas · Officer Grant (A) 8K
Owned 8K Trade date Jul 8, 2026 Filed date Jul 10, 2026
Desrosier Thomas Officer Grant (A) 8K 8K Jul 8, 2026 Jul 10, 2026
Berenson Stephen · Director Grant (A) 8K
Owned 8K Trade date Jul 1, 2026 Filed date Jul 2, 2026
Berenson Stephen Director Grant (A) 8K 8K Jul 1, 2026 Jul 2, 2026
Rosiello Robert L. · Director Grant (A) 8K
Owned 8K Trade date Jul 1, 2026 Filed date Jul 2, 2026
Rosiello Robert L. Director Grant (A) 8K 8K Jul 1, 2026 Jul 2, 2026
Ausiello Dennis A. · Director Grant (A) 8K
Owned 8K Trade date Jul 1, 2026 Filed date Jul 2, 2026
Ausiello Dennis A. Director Grant (A) 8K 8K Jul 1, 2026 Jul 2, 2026
15 of 55
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Seres Therapeutics, Inc. (MCRB) activist and large shareholders

What are Schedules 13D and 13G?

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Nestle SA 21.8M
% of shares outstanding 14.3% Filing date Oct 2, 2024
Nestle SA 21.8M 14.3% Oct 2, 2024
FMR LLC 494K
% of shares outstanding 5.7% Filing date Jun 6, 2025
FMR LLC 494K 5.7% Jun 6, 2025
Vanguard Group Inc 6.1M
% of shares outstanding 4.9% Filing date Feb 9, 2023
Vanguard Group Inc 6.1M 4.9% Feb 9, 2023
BlackRock Inc. 6.8M
% of shares outstanding 4.5% Filing date Apr 5, 2024
BlackRock Inc. 6.8M 4.5% Apr 5, 2024
Federated Hermes, Inc. 5.2M
% of shares outstanding 4.0% Filing date Nov 7, 2023
Federated Hermes, Inc. 5.2M 4.0% Nov 7, 2023
State Street Corp
% of shares outstanding 3.7% Filing date Feb 3, 2023
State Street Corp 3.7% Feb 3, 2023
Flagship Venturelabs Iv, LLC 2.7M
% of shares outstanding 2.2% Filing date Jul 7, 2022
Flagship Venturelabs Iv, LLC 2.7M 2.2% Jul 7, 2022
Nikko Asset Management Americas, Inc. 786K
% of shares outstanding 0.9% Filing date Feb 14, 2022
Nikko Asset Management Americas, Inc. 786K 0.9% Feb 14, 2022
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Seres Therapeutics, Inc. (MCRB) ownership FAQ

Who owns MCRB?

28 reporting institutions disclosed MCRB position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.