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Disclosery

MCRB SERES THERAPEUTICS INC

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CMN (common), issuer CIK 1609809

34 managers (36 13F filers) reported a position in MCRB shares at 2026-06-30, 2,274,378 shares in all. 8 filers opened a position and 5 filers sold out during the quarter.

Managers
34
13F filers
36
New
8
Added
7
Reduced
12
Sold out
5
Shares held by filers
2,274,378

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q2 2026

Filers in the available 13F reports with a share position at 2026-06-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
Flagship Pioneering, LLCin group Flagship Pioneering, LLC1,155,850$9.12M0.59%013F-HRTimelineGroup
VANGUARD GROUP INCgroup of 3 filers holding338,436$2.67M+2,675Timeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP172,245$1.36M<0.01%+32,70613F-HRTimelineGroup
Vontobel Holding Ltd.in group Vontobel Holding Ltd.122,975$970K<0.01%-15,49313F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.111,000$876K<0.01%+8,97413F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC79,974$631K<0.01%+5,13913F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…58,328$460K<0.01%-47,01113F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP33,901$267K<0.01%013F-HRTimelineGroup
Lion Point Capital, LP31,570$249K1.19%013F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co31,049$245K<0.01%-58113F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC28,313$223K<0.01%-34,00313F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd20,732$164K<0.01%new13F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC15,229$120K<0.01%new13F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP14,765$116K<0.01%013F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.12,974$102K<0.01%-1,57313F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY12,138$95.8K<0.01%-9,56213F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC10,504$82.9K<0.01%new13F-HRTimelineGroup
SIMPLEX TRADING, LLC4,598$36.3K<0.01%+1,52813F-HRTimeline
SBI Securities Co., Ltd.4,182$33K<0.01%+70013F-HRTimeline
Integrated Wealth Concepts LLC4,000$31.6K<0.01%new13F-HRTimeline
GROUP ONE TRADING LLC3,714$29.3K<0.01%+2,89013F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO3,636$28.3K<0.01%new13F-HRTimelineGroup
FMR LLCin group FMR LLC1,528$12.1K<0.01%-22413F-HRTimelineGroup
Rachor Investment Advisory Services, LLC1,477$11.7K0.01%013F-HRTimeline
UBS Group AGin group UBS Group AG484$3.82K<0.01%-6,54613F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…316$2.49K<0.01%-47813F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS211$1.67K<0.01%013F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC167$1.32K<0.01%-6,34013F-HRTimelineGroup
Continuum Advisory, LLC47$371<0.01%new13F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN10$79<0.01%013F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.8$63<0.01%013F-HRTimelineGroup
Larson Financial Group LLC5$39<0.01%new13F-HRTimeline
WHITTIER TRUST CO OF NEVADA INC1$8<0.01%new13F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA11$00%-9613F-HRTimelineGroupValue filed as zero, left out of ratios.