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MCRB SERES THERAPEUTICS INC

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CMN (common), issuer CIK 1609809

31 managers (33 13F filers) reported a position in MCRB shares at 2026-03-31, 2,306,473 shares in all. 2 filers opened a position and 7 filers sold out during the quarter.

Managers
31
13F filers
33
New
2
Added
10
Reduced
8
Sold out
7
Shares held by filers
2,306,473

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, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, 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$10.3M0.88%013F-HRTimelineGroup
VANGUARD GROUP INCgroup of 3 filers holding335,761$2.98MnewTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP139,539$1.24M<0.01%+19,36213F-HRTimelineGroup
Vontobel Holding Ltd.in group Vontobel Holding Ltd.138,468$1.23M<0.01%+35,23413F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…105,339$934K<0.01%-74,59013F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.102,026$905K<0.01%-1,59513F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC74,835$664K<0.01%-11,30713F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC62,316$553K<0.01%+46,04513F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP33,901$301K<0.01%013F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co31,630$281K<0.01%+26113F-HRTimelineGroup
Lion Point Capital, LP31,570$280K1.67%013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY21,700$192K<0.01%-3,42613F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP18,794$167K<0.01%-6,95513F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP14,765$131K<0.01%013F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.14,547$129K<0.01%+18713F-HRTimelineGroup
UBS Group AGin group UBS Group AG7,030$62.4K<0.01%+2,80413F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC6,507$57.7K<0.01%-92513F-HRTimelineGroup
SBI Securities Co., Ltd.3,482$30.9K<0.01%013F-HRTimeline
SIMPLEX TRADING, LLC3,070$27.2K<0.01%+1,83813F-HRTimeline
FMR LLCin group FMR LLC1,752$15.5K<0.01%+1213F-HRTimelineGroup
Rachor Investment Advisory Services, LLC1,477$13.1K0.01%013F-HRTimeline
GROUP ONE TRADING LLC824$7.31K<0.01%new13F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…794$7.04K<0.01%new13F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS211$1.87K<0.01%-56213F-HRTimelineGroup
Physician Wealth Advisors, Inc.142$1.26K<0.01%013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA107$1K<0.01%+9813F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN10$89<0.01%-25013F-HR/ATimelineGroup
Sound Income Strategies, LLC8$71<0.01%013F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.8$70<0.01%013F-HRTimelineGroup
Allworth Financial LP4$36<0.01%013F-HRTimeline
Arax Advisory Partners6$18<0.01%+413F-HRTimeline