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Disclosery

KRRO KORRO BIO INC

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COMMON STOCK (common), issuer CIK 1703647

103 managers (107 13F filers) reported a position in KRRO shares at 2026-06-30, 14,426,013 shares in all. 19 filers opened a position and 11 filers sold out during the quarter.

Managers
103
13F filers
107
New
19
Added
47
Reduced
19
Sold out
11
Shares held by filers
14,426,013

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
Lynx1 Capital Management LPin group Lynx1 Capital Management LP1,538,296$20.3M2.34%013F-HR/ATimelineGroup
NEA Management Company, LLC1,297,893$17.1M1.08%013F-HRTimeline
Venrock Adviser, LLC1,009,500$13.3M0.4%013F-HRTimeline
Atlas Venture Life Science Advisors, LLC962,884$12.7M1.44%-174,26513F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management951,783$12.5M0.02%-88,27113F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.817,621$10.8M<0.01%+357,61513F-HRTimelineGroup
VANGUARD GROUP INCgroup of 4 filers holding755,159$9.95M+252,217Timeline
Affinity Asset Advisors, LLC706,904$9.32M0.46%013F-HRTimeline
Nantahala Capital Management, LLC660,036$8.7M0.53%013F-HR/ATimeline
ADAGE CAPITAL PARTNERS GP, L.L.C.in group ADAGE CAPITAL PARTNERS GP, L.…540,968$7.13M0.01%+312,56813F-HRTimelineGroup
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC540,054$7.12M0.33%013F-HRTimelineGroup
Driehaus Capital Management LLC450,045$5.93M0.03%013F-HRTimeline
TCG Crossover Management, LLC416,301$5.49M0.13%013F-HRTimeline
Kalehua Capital Management LLC405,040$5.34M3.07%+295,66413F-HR/ATimeline
Siren, L.L.C.in group Siren, L.L.C.347,718$4.58M0.09%013F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC298,974$3.94M<0.01%+31,21913F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC296,870$3.91M<0.01%+123,22713F-HRTimelineGroup
72 Investment Holdings, LLC276,831$3.65M7.3%013F-HRTimeline
STATE STREET CORPin group STATE STREET CORP232,587$3.07M<0.01%+92,24613F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP178,071$2.35M<0.01%+12,59913F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO124,726$1.65M<0.01%+56,22613F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC118,434$1.56M<0.01%+54,82813F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC116,983$1.54M<0.01%+66,44213F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC110,524$1.46M<0.01%-25,70313F-HRTimeline
UBS Group AGgroup of 2 filers holding105,678$1.39M+83,777Timeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP88,089$1.16M<0.01%+30,38713F-HRTimelineGroup
EMERALD MUTUAL FUND ADVISERS TRUSTin group EMERALD ADVISERS, LLC63,562$838K0.03%+70713F-HRTimelineGroup
F/m Investments LLC63,562$838K0.04%+70713F-HRTimeline
Walleye Capital LLCin group Walleye Capital LLC54,289$716K<0.01%new13F-HRTimelineGroup
Quantinno Capital Management LP52,720$695K<0.01%+16,74213F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/51,707$681K<0.01%new13F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC48,920$645K<0.01%+6,08213F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd47,819$630K0.01%-12,65313F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC40,390$532K<0.01%+9,47613F-HRTimelineGroup
FMR LLCin group FMR LLC38,975$514K<0.01%+7513F-HRTimelineGroup
BOOTHBAY FUND MANAGEMENT, LLC35,853$473K0.01%-6,14713F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.34,213$451K<0.01%new13F-HRTimelineGroup
Jump Financial, LLCin group Jump Financial, LLC33,906$447K<0.01%new13F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp31,730$418K<0.01%+10,00013F-HRTimelineGroup
AIHC Capital Management Ltd30,265$399K0.38%013F-HRTimeline
Mariner, LLCin group Mariner, LLC27,908$368K<0.01%+2,08913F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS26,254$346K<0.01%+23,90013F-HRTimelineGroup
PANAGORA ASSET MANAGEMENT INC25,572$337K<0.01%new13F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co24,110$318K<0.01%+10,71613F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY22,501$297K<0.01%-18,62213F-HRTimelineGroup
IEQ CAPITAL, LLC21,246$280K<0.01%+8,46913F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP19,060$251K<0.01%-15,28313F-HRTimelineGroup
GUGGENHEIM CAPITAL LLCin group GUGGENHEIM CAPITAL LLC18,400$243K<0.01%+4,30313F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/17,634$233K<0.01%new13F-HRTimeline
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC17,812$233K<0.01%new13F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\15,948$210K<0.01%+5,40413F-HRTimelineGroup
Nuveen, LLCin group TIAA15,861$209K<0.01%new13F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC14,480$189K<0.01%-27,34513F-HRTimelineGroup
ALGERT GLOBAL LLC14,212$187K<0.01%-4,97313F-HRTimeline
Susquehanna Portfolio Strategies, LLCin group SUSQUEHANNA INTERNATIONAL GRO…13,500$178K<0.01%-5,62513F-HRTimelineGroup
MERCER GLOBAL ADVISORS INC /ADV12,888$170K<0.01%new13F-HR/ATimeline
WEALTH ENHANCEMENT ADVISORY SERVICES, L…11,508$168K<0.01%new13F-HRTimeline
RHUMBLINE ADVISERS12,401$163K<0.01%+2,55113F-HRTimeline
Trexquant Investment LP11,482$151K<0.01%-44,72613F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP11,406$150K<0.01%new13F-HRTimelineGroup
Cerity Partners LLCin group Cerity Partners LLC10,794$142K<0.01%new13F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.12,180$138K<0.01%new13F-HRTimeline
Engineers Gate Manager LP10,217$135K<0.01%-13,48513F-HRTimeline
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC10,153$134K<0.01%new13F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN9,564$126K<0.01%+6,97513F-HRTimelineGroup
Arax Advisory Partners5,595$73.7K<0.01%+5,50913F-HRTimeline
CITIGROUP INCin group CITIGROUP INC5,169$68.1K<0.01%+4,86113F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…5,130$67.6K<0.01%+1,91613F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…4,939$65.1K<0.01%+2,82413F-HRTimelineGroup
Police & Firemen's Retirement System of…4,627$61K<0.01%+3,25413F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND3,000$39.5K<0.01%013F-HRTimeline
SIMPLEX TRADING, LLC1,975$26K<0.01%new13F-HRTimeline
North Star Investment Management Corp.1,800$23.7K<0.01%013F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…1,587$20.9K<0.01%-5713F-HRTimelineGroup
Integrated Wealth Concepts LLC1,585$20.9K<0.01%new13F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc1,082$14.3K<0.01%+55613F-HRTimelineGroup
GAMMA Investing LLC861$11.3K<0.01%+12413F-HRTimeline
TD Waterhouse Canada Inc.808$11K<0.01%013F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…598$7.88K<0.01%013F-HRTimelineGroup
Versant Capital Management, Inc539$7.1K<0.01%-15213F-HRTimeline
Allworth Financial LP538$7.09K<0.01%+24713F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…498$6.56K<0.01%+11913F-HRTimelineGroup
DUNCKER STREETT & CO INC437$5.76K<0.01%013F-HRTimeline
IFP Advisors, Inc418$5.51K<0.01%+37313F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA352$4K<0.01%+24813F-HRTimelineGroup
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…193$2.54K<0.01%-63713F-HRTimelineGroup
True Wealth Design, LLC192$2.53K<0.01%+9313F-HRTimeline
Sterling Capital Management LLC191$2.52K<0.01%-2913F-HRTimeline
Essential Partners LLC180$2.37K<0.01%-1,14213F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.134$1.77K<0.01%-113F-HRTimelineGroup
ROTHSCHILD INVESTMENT LLC123$1.62K<0.01%+5113F-HRTimeline
Farther Finance Advisors, LLC115$1.52K<0.01%+6113F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…93$1.23K<0.01%new13F-HR/ATimeline
Optiver Holding B.V.in group Optiver Holding B.V.60$791<0.01%013F-HRTimelineGroup
Basecamp Wealth Advisors LLC45$593<0.01%+2013F-HRTimeline
Timbuktu Capital Management, LLC38$501<0.01%13F-HRTimeline
Global Retirement Partners, LLC35$461<0.01%13F-HRTimeline
Wealth Enhancement Trust Services, Inc.33$435<0.01%new13F-HR/ATimeline
SJS Investment Consulting Inc.29$383<0.01%+713F-HRTimeline
NISA INVESTMENT ADVISORS, LLC20$264<0.01%-2013F-HRTimeline
Clearstead Advisors, LLC19$252<0.01%new13F-HRTimeline
JPL Wealth Management, LLC3$40<0.01%+113F-HRTimeline
SBI Securities Co., Ltd.1$13<0.01%013F-HRTimeline