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Disclosery

KRRO KORRO BIO INC

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COMMON STOCK (common), issuer CIK 1703647

76 managers (76 13F filers) reported a position in KRRO shares at 2025-03-31, 9,704,926 shares in all. 9 filers opened a position and 18 filers sold out during the quarter.

Managers
76
13F filers
76
New
9
Added
22
Reduced
24
Sold out
18
Shares held by filers
9,704,926

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 2025

Filers in the available 13F reports with a share position at 2025-03-31, 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
Atlas Venture Life Science Advisors, LLC1,137,149$19.8M3.79%013F-HRTimeline
NEA Management Company, LLC1,090,793$19M1.46%013F-HRTimeline
Deep Track Capital, LP874,614$15.2M0.49%013F-HRTimeline
ALLIANCEBERNSTEIN L.P.680,517$11.8M<0.01%-25,27713F-HRTimeline
FMR LLCin group FMR LLC643,269$11.2M<0.01%+1,53013F-HRTimelineGroup
Driehaus Capital Management LLC582,449$10.1M0.1%+87,54413F-HRTimeline
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.520,890$9.07M0.03%+26,89313F-HR/ATimelineGroup
BlackRock, Inc.in group BlackRock, Inc.441,430$7.69M<0.01%-11,01913F-HRTimelineGroup
Siren, L.L.C.in group Siren, L.L.C.418,833$7.29M0.41%013F-HR/ATimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC381,799$6.65M<0.01%-7,69113F-HRTimelineGroup
Cormorant Asset Management, LP380,303$6.62M0.5%new13F-HRTimeline
QIMING U.S. VENTURES MANAGEMENT, LLC368,085$6.41M27.74%013F-HRTimeline
72 Investment Holdings, LLC276,831$4.82M13.54%013F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC253,250$4.41M<0.01%-116,48313F-HRTimelineGroup
Polar Capital Holdings Plcin group Polar Capital Holdings Plc250,000$4.35M0.03%+175,00013F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC140,221$2.44M<0.01%+3,13413F-HRTimelineGroup
Tri Locum Partners LP128,381$2.24M1.15%-15,83513F-HRTimeline
STATE STREET CORPin group STATE STREET CORP122,438$2.13M<0.01%-1,64113F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC108,869$1.9M<0.01%+13,06113F-HRTimelineGroup
FRANKLIN RESOURCES INCin group Franklin Resources91,704$1.6M<0.01%-5313F-HRTimelineGroup
Aberdeen Group plcin group Aberdeen Group plc84,428$1.47M<0.01%new13F-HRTimelineGroup
UBS Group AGin group UBS Group AG74,211$1.29M<0.01%+1,17213F-HRTimelineGroup
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC68,715$1.2M0.23%+10,73713F-HRTimelineGroup
Ally Bridge Group (NY) LLC59,723$1.04M0.94%-10,95513F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP58,211$1.01M<0.01%-2,33613F-HRTimelineGroup
Woodline Partners LP50,094$872K0.01%-52,00013F-HRTimeline
DAFNA Capital Management LLC47,086$820K0.23%new13F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY43,100$750K<0.01%+14,53813F-HRTimelineGroup
Rock Springs Capital Management LP35,719$622K0.04%013F-HRTimeline
ORBIMED ADVISORS LLCin group ORBIMED ADVISORS LLC32,400$564K0.01%013F-HRTimelineGroup
Walleye Capital LLCin group Walleye Capital LLC30,955$539K0.01%-10,27313F-HRTimelineGroup
Schonfeld Strategic Advisors LLC30,475$531K<0.01%-82,59013F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC20,944$365K<0.01%-2,35713F-HR/ATimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co18,288$318K<0.01%+79013F-HR/ATimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC18,222$317K<0.01%+7,87513F-HRTimelineGroup
BLAIR WILLIAM & CO/IL16,230$283K<0.01%+3,33513F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp16,113$281K<0.01%+1,32513F-HRTimelineGroup
Nuveen, LLCin group TIAA12,145$211K<0.01%13F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd10,600$185K0.01%new13F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…10,372$181K<0.01%new13F-HRTimelineGroup
AlphaQuest LLC9,196$160K0.02%+7,00713F-HRTimeline
RHUMBLINE ADVISERS9,069$158K<0.01%-53313F-HR/ATimeline
BARCLAYS PLCin group BARCLAYS PLC7,241$126K<0.01%-3,14313F-HR/ATimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA6,097$106K<0.01%-1,62313F-HR/ATimelineGroup
CITIGROUP INCin group CITIGROUP INC4,831$84.1K<0.01%-46713F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/4,541$79.1K<0.01%-2,49613F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN3,793$66K<0.01%+40113F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…3,658$63.7K<0.01%+15613F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…3,639$63.4K<0.01%013F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\3,616$63K<0.01%-49413F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO3,069$53.4K<0.01%+21513F-HRTimelineGroup
Corebridge Financial, Inc.in group Corebridge Financial, Inc.3,019$52.6K<0.01%-1413F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND3,000$52.2K<0.01%013F-HR/ATimeline
Quarry LP2,011$35K0.01%new13F-HRTimeline
North Star Investment Management Corp.1,800$31.3K<0.01%013F-HRTimeline
Police & Firemen's Retirement System of…1,226$21.3K<0.01%013F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…764$13.3K<0.01%+48613F-HRTimelineGroup
Steward Partners Investment Advisory, L…650$11.3K<0.01%+10013F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…598$10.4K<0.01%013F-HRTimelineGroup
GAMMA Investing LLC593$10.3K<0.01%+58513F-HR/ATimeline
Legal & General Group Plcin group Legal & General Group Plc566$9.85K<0.01%-3,75913F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…442$7.7K<0.01%-4,40813F-HRTimeline
DUNCKER STREETT & CO INC437$7.61K<0.01%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS373$6.49K<0.01%-6,61513F-HRTimelineGroup
NISA INVESTMENT ADVISORS, LLC331$5.76K<0.01%+30513F-HRTimeline
AMALGAMATED BANK211$4K<0.01%013F-HRTimeline
Sterling Capital Management LLC82$1.43K<0.01%-6413F-HRTimeline
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.64$1.11K<0.01%new13F-HRTimelineGroup
BNP PARIBASin group BNP PARIBAS59$1.03K<0.01%new13F-HRTimelineGroup
CWM, LLCin group CWM, LLC41$1K<0.01%+3913F-HRTimelineGroup
Spire Wealth Managementin group Spire Wealth Management39$679<0.01%013F-HRTimelineGroup
SBI Securities Co., Ltd.7$122<0.01%013F-HRTimeline
MAI Capital Management5$88<0.01%013F-HRTimeline
True Wealth Design, LLC1$18<0.01%new13F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.1$17<0.01%013F-HRTimelineGroup
CONCOURSE FINANCIAL GROUP SECURITIES, I…0$0013F-HRTimelineValue filed as zero, left out of ratios. Amount filed as zero, left out of ratios.