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Disclosery

KRRO KORRO BIO INC

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COMMON STOCK (common), issuer CIK 1703647

81 managers (83 13F filers) reported a position in KRRO shares at 2025-12-31, 7,561,981 shares in all. 20 filers opened a position and 30 filers sold out during the quarter.

Managers
81
13F filers
83
New
20
Added
24
Reduced
22
Sold out
30
Shares held by filers
7,561,981

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, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, 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
Atlas Venture Life Science Advisors, LLC1,137,149$9.11M1.05%013F-HRTimeline
NEA Management Company, LLC1,090,793$8.74M0.45%013F-HRTimeline
Lynx1 Capital Management LPin group Lynx1 Capital Management LP677,915$5.43M1.1%new13F-HRTimelineGroup
Nantahala Capital Management, LLCin group Nantahala Capital Management,…600,000$4.81M0.29%new13F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC489,639$3.92M<0.01%+93,98013F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.457,399$3.66M<0.01%+10,70113F-HRTimelineGroup
TCG Crossover Management, LLC416,301$3.33M0.11%013F-HRTimeline
Siren, L.L.C.in group Siren, L.L.C.347,718$2.79M0.08%-71,11513F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC288,457$2.31M<0.01%new13F-HRTimelineGroup
72 Investment Holdings, LLC276,831$2.22M4.38%013F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…196,827$1.58M<0.01%new13F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC162,760$1.3M<0.01%-17213F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC161,092$1.29M<0.01%-99,24113F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP146,221$1.17M<0.01%+21,65213F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding90,221$723K+14,357Timeline
RENAISSANCE TECHNOLOGIES LLC74,900$600K<0.01%+34,50013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY69,728$559K<0.01%-97,76613F-HR/ATimelineGroup
F/m Investments LLC65,548$525K0.02%+10,30313F-HRTimeline
EMERALD ADVISERS, LLCgroup of 2 filers holding65,548$525K-9,832Timeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC58,329$467K<0.01%-95,59913F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd57,067$457K0.01%+13,52913F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP55,640$446K<0.01%-1,63313F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC51,950$416K<0.01%+36,26913F-HR/ATimelineGroup
Graham Capital Management, L.P.40,766$327K0.01%new13F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC40,647$326K<0.01%-7,76013F-HRTimelineGroup
FMR LLCin group FMR LLC37,857$303K<0.01%-525,82413F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC33,790$270K<0.01%new13F-HRTimelineGroup
AIHC Capital Management Ltd30,265$242K0.23%13F-HRTimeline
SIMPLEX TRADING, LLC28,247$226K0.01%new13F-HRTimeline
Quantinno Capital Management LP27,597$221K<0.01%+21,45413F-HRTimeline
ALGERT GLOBAL LLC27,065$217K<0.01%+19,95713F-HR/ATimeline
Quadrature Capital Ltdin group Quadrature Capital Ltd27,064$217K<0.01%new13F-HRTimelineGroup
Engineers Gate Manager LP26,885$215K<0.01%new13F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC23,031$184K<0.01%-125,94013F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding20,086$161K-33,017Timeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP19,772$158K<0.01%new13F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp18,855$151K<0.01%-45813F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co16,329$131K<0.01%-6,77213F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\12,758$102K<0.01%+9,02713F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC10,590$84.8K<0.01%+1,83313F-HRTimelineGroup
Jain Global LLC10,574$84.7K<0.01%new13F-HRTimeline
GUGGENHEIM CAPITAL LLCin group GUGGENHEIM CAPITAL LLC10,439$83.6K<0.01%new13F-HRTimelineGroup
RHUMBLINE ADVISERS10,250$82.1K<0.01%+90713F-HRTimeline
AlphaQuest LLC7,703$61.7K<0.01%+5,23513F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN7,522$60.3K<0.01%+2,35213F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/5,896$47.2K<0.01%+1,19213F-HRTimelineGroup
GROUP ONE TRADING LLC4,000$32K<0.01%new13F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…3,146$25.2K<0.01%+813F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND3,000$24K<0.01%013F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO2,838$22.7K<0.01%-196,41113F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…1,930$15.5K<0.01%+1,11513F-HRTimelineGroup
North Star Investment Management Corp.1,800$14.4K<0.01%013F-HRTimeline
Steward Partners Investment Advisory, L…1,500$12K<0.01%-25013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS1,487$11.9K<0.01%+17313F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.1,417$11.3K<0.01%+1,13713F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…1,391$11.1K<0.01%+35313F-HRTimelineGroup
Police & Firemen's Retirement System of…1,373$11K<0.01%-91313F-HRTimeline
TD Waterhouse Canada Inc.800$6.4K<0.01%new13F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…740$5.93K<0.01%-2,17413F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC607$4.86K<0.01%+27013F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…598$4.79K<0.01%013F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc526$4.21K<0.01%013F-HRTimelineGroup
LOS ANGELES CAPITAL MANAGEMENT LLC110$4.01K<0.01%new13F-HRTimeline
Sterling Capital Management LLC458$3.67K<0.01%013F-HRTimeline
DUNCKER STREETT & CO INC437$3.5K<0.01%013F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…408$3.27K<0.01%-813F-HRTimeline
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.302$2.42K<0.01%new13F-HRTimelineGroup
CWM, LLCin group CWM, LLC288$2K<0.01%-2,40513F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA224$2K<0.01%-5,76813F-HRTimelineGroup
AMALGAMATED BANK208$2K<0.01%-313F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.116$929<0.01%013F-HRTimelineGroup
GAMMA Investing LLC102$817<0.01%+1313F-HRTimeline
Keating Financial Advisory Services, In…63$505<0.01%13F-HRTimeline
IFP Advisors, Inc40$320<0.01%013F-HRTimeline
Global Retirement Partners, LLC35$280<0.01%new13F-HRTimeline
ROTHSCHILD INVESTMENT LLC6$48<0.01%new13F-HRTimeline
MAI Capital Management5$41<0.01%013F-HRTimeline
NORTHWESTERN MUTUAL WEALTH MANAGEMENT COin group NORTHWESTERN MUTUAL INVESTMEN…2$16<0.01%013F-HR/ATimelineGroup
Allworth Financial LP1$9<0.01%-9113F-HRTimeline
Sunbelt Securities, Inc.1$8<0.01%new13F-HRTimeline
SBI Securities Co., Ltd.1$8<0.01%013F-HRTimeline