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Disclosery

KRRO KORRO BIO INC

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COMMON STOCK (common), issuer CIK 1703647

72 managers (72 13F filers) reported a position in KRRO shares at 2025-06-30, 9,051,545 shares in all. 10 filers opened a position and 15 filers sold out during the quarter.

Managers
72
13F filers
72
New
10
Added
26
Reduced
13
Sold out
15
Shares held by filers
9,051,545

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 2025

Filers in the available 13F reports with a share position at 2025-06-30, 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
Atlas Venture Life Science Advisors, LLC1,137,149$14.2M2.14%013F-HRTimeline
NEA Management Company, LLC1,090,793$13.6M1.03%013F-HRTimeline
FMR LLCin group FMR LLC639,222$7.98M<0.01%-4,04713F-HRTimelineGroup
Driehaus Capital Management LLC580,859$7.25M0.06%-1,59013F-HRTimeline
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.540,074$6.75M0.02%+19,18413F-HRTimelineGroup
Cormorant Asset Management, LP465,000$5.81M0.43%+84,69713F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.461,889$5.77M<0.01%+20,45913F-HRTimelineGroup
Siren, L.L.C.in group Siren, L.L.C.418,833$5.23M0.27%013F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC386,738$4.83M<0.01%+4,93913F-HRTimelineGroup
QIMING U.S. VENTURES MANAGEMENT, LLC368,085$4.6M19.47%013F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC350,646$4.38M<0.01%+97,39613F-HRTimelineGroup
Tri Locum Partners LP139,493$3.48M1.06%+11,11213F-HRTimeline
Deep Track Capital, LP277,966$3.47M0.11%-596,64813F-HRTimeline
72 Investment Holdings, LLC276,831$3.46M9.02%013F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC255,683$3.19M<0.01%+146,81413F-HRTimelineGroup
Polar Capital Holdings Plcin group Polar Capital Holdings Plc250,000$3.12M0.02%013F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC155,387$1.94M<0.01%+15,16613F-HRTimelineGroup
Ally Bridge Group (NY) LLC154,223$1.93M1.6%+94,50013F-HRTimeline
Blue Owl Capital Holdings LP125,000$1.56M0.5%new13F-HRTimeline
STATE STREET CORPin group STATE STREET CORP121,940$1.52M<0.01%-49813F-HRTimelineGroup
Aberdeen Group plcin group Aberdeen Group plc84,428$1.05M<0.01%013F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC83,392$1.04M<0.01%+65,17013F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY81,733$1.02M<0.01%+38,63313F-HRTimelineGroup
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC68,815$859K0.14%+10013F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP57,868$723K<0.01%-34313F-HRTimelineGroup
DAFNA Capital Management LLC57,691$721K0.2%+10,60513F-HRTimeline
Woodline Partners LP50,094$626K<0.01%013F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC45,700$571K<0.01%new13F-HRTimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP36,746$459K<0.01%new13F-HRTimelineGroup
Rock Springs Capital Management LP35,719$446K0.03%013F-HRTimeline
ORBIMED ADVISORS LLCin group ORBIMED ADVISORS LLC32,400$405K0.01%013F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/28,156$352K<0.01%+23,61513F-HRTimelineGroup
AlphaQuest LLC27,211$340K0.03%+18,01513F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.24,383$305K<0.01%new13F-HRTimelineGroup
Trexquant Investment LP20,870$261K<0.01%new13F-HRTimeline
UBS Group AGin group UBS Group AG18,581$232K<0.01%-55,63013F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co17,776$222K<0.01%-51213F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp16,522$206K<0.01%+40913F-HRTimelineGroup
Walleye Capital LLCin group Walleye Capital LLC16,060$201K<0.01%-14,89513F-HRTimelineGroup
RHUMBLINE ADVISERS9,511$119K<0.01%+44213F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA6,605$82K<0.01%+50813F-HR/ATimelineGroup
Quarry LP4,500$56.2K0.01%+2,48913F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN4,333$54.1K<0.01%+54013F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\3,616$45.2K<0.01%013F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…3,502$43.7K<0.01%-15613F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO3,170$39.6K<0.01%+10113F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND3,000$37.5K<0.01%013F-HR/ATimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…2,709$33.8K<0.01%+1,94513F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC2,484$31K<0.01%-2,34713F-HRTimelineGroup
North Star Investment Management Corp.1,800$22.5K<0.01%013F-HRTimeline
Police & Firemen's Retirement System of…1,226$15.3K<0.01%013F-HRTimeline
Steward Partners Investment Advisory, L…1,150$14.4K<0.01%+50013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS653$8.16K<0.01%+28013F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…598$7.47K<0.01%013F-HRTimelineGroup
CWM, LLCin group CWM, LLC548$7K<0.01%+50713F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc526$6.57K<0.01%-4013F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…442$5.52K<0.01%013F-HRTimeline
DUNCKER STREETT & CO INC437$5.46K<0.01%013F-HRTimeline
Versant Capital Management, Inc282$3.52K<0.01%new13F-HRTimeline
AMALGAMATED BANK211$3K<0.01%013F-HRTimeline
Sterling Capital Management LLC121$1.51K<0.01%+3913F-HR/ATimeline
GAMMA Investing LLC66$824<0.01%-52713F-HRTimeline
NISA INVESTMENT ADVISORS, LLC30$375<0.01%-30113F-HRTimeline
Rise Advisors, LLC29$362<0.01%new13F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…22$275<0.01%new13F-HRTimelineGroup
SBI Securities Co., Ltd.7$87<0.01%013F-HRTimeline
IFP Advisors, Inc0$75<0.01%new13F-HRTimelineAmount filed as zero, left out of ratios.
MAI Capital Management5$63<0.01%013F-HRTimeline
Essential Partners LLC3$37<0.01%13F-HRTimeline
NORTHWESTERN MUTUAL WEALTH MANAGEMENT COin group NORTHWESTERN MUTUAL INVESTMEN…2$25<0.01%new13F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.1$12<0.01%013F-HR/ATimelineGroup
CONCOURSE FINANCIAL GROUP SECURITIES, I…0$0013F-HRTimelineValue filed as zero, left out of ratios. Amount filed as zero, left out of ratios.