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Disclosery

KRRO KORRO BIO INC

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COMMON STOCK (common), issuer CIK 1703647

95 managers (99 13F filers) reported a position in KRRO shares at 2026-03-31, 12,801,727 shares in all. 29 filers opened a position and 15 filers sold out during the quarter.

Managers
95
13F filers
99
New
29
Added
33
Reduced
20
Sold out
15
Shares held by filers
12,801,727

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
Lynx1 Capital Management LPin group Lynx1 Capital Management LP1,538,296$17.4M2.75%+860,38113F-HRTimelineGroup
NEA Management Company, LLC1,297,893$14.7M0.84%+207,10013F-HRTimeline
Atlas Venture Life Science Advisors, LLC1,137,149$12.9M1.63%013F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management1,040,054$11.8M0.02%new13F-HRTimelineGroup
Venrock Adviser, LLC1,009,500$11.4M0.43%new13F-HRTimeline
Affinity Asset Advisors, LLC706,904$8M0.47%new13F-HRTimeline
Nantahala Capital Management, LLCin group Nantahala Capital Management,…660,036$7.47M0.47%+60,03613F-HRTimelineGroup
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC540,054$6.11M0.37%new13F-HRTimelineGroup
VANGUARD GROUP INCgroup of 4 filers holding502,942$5.69MnewTimeline
BlackRock, Inc.in group BlackRock, Inc.460,006$5.21M<0.01%+2,60713F-HRTimelineGroup
Driehaus Capital Management LLC450,045$5.09M0.04%new13F-HRTimeline
TCG Crossover Management, LLC416,301$4.71M0.13%013F-HRTimeline
Siren, L.L.C.in group Siren, L.L.C.347,718$3.94M0.11%013F-HRTimelineGroup
72 Investment Holdings, LLC276,831$3.13M6.32%013F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC267,755$3.03M<0.01%+227,10813F-HRTimelineGroup
ADAGE CAPITAL PARTNERS GP, L.L.C.in group ADAGE CAPITAL PARTNERS GP, L.…228,400$2.59M<0.01%new13F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC173,643$1.97M<0.01%+10,88313F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP165,472$1.87M<0.01%+86,48813F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP140,341$1.59M<0.01%-5,88013F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC136,227$1.54M<0.01%+61,32713F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC115,704$1.31M<0.01%-172,75313F-HRTimelineGroup
Kalehua Capital Management LLC109,376$1.24M0.88%new13F-HR/ATimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC63,606$720K<0.01%-97,48613F-HRTimelineGroup
EMERALD MUTUAL FUND ADVISERS TRUSTin group EMERALD ADVISERS, LLC62,855$712K0.03%-2,69313F-HRTimelineGroup
F/m Investments LLC62,855$712K0.05%-2,69313F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO68,500$704K<0.01%+65,66213F-HR/ATimelineGroup
XTX Topco Ltdin group XTX Topco Ltd60,472$685K0.01%+3,40513F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP57,702$653K<0.01%+2,06213F-HRTimelineGroup
Trexquant Investment LP56,208$636K<0.01%new13F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC50,541$572K<0.01%-1,40913F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC42,838$485K<0.01%+19,80713F-HRTimelineGroup
BOOTHBAY FUND MANAGEMENT, LLC42,000$475K0.01%new13F-HRTimeline
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC41,825$471K<0.01%+8,03513F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY41,123$466K<0.01%-28,60513F-HRTimelineGroup
FMR LLCin group FMR LLC38,900$440K<0.01%+1,04313F-HRTimelineGroup
Quantinno Capital Management LP35,978$407K<0.01%+8,38113F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP34,343$389K<0.01%+14,57113F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC30,914$350K<0.01%-27,41513F-HRTimelineGroup
AIHC Capital Management Ltd30,265$343K0.29%013F-HRTimeline
Mariner, LLCin group Mariner, LLC25,819$292K<0.01%new13F-HRTimelineGroup
Engineers Gate Manager LP23,702$268K<0.01%-3,18313F-HRTimeline
UBS Group AGgroup of 2 filers holding21,901$248K+1,815Timeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp21,730$246K<0.01%+2,87513F-HRTimelineGroup
Quadrature Capital Ltdin group Quadrature Capital Ltd20,356$230K<0.01%-6,70813F-HRTimelineGroup
ALGERT GLOBAL LLC19,185$217K<0.01%-7,88013F-HR/ATimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 2 filers holding19,125$216K-177,702Timeline
GUGGENHEIM CAPITAL LLCin group GUGGENHEIM CAPITAL LLC14,097$160K<0.01%+3,65813F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co13,394$152K<0.01%-2,93513F-HRTimelineGroup
IEQ CAPITAL, LLC12,777$145K<0.01%new13F-HRTimeline
HRT FINANCIAL LP10,790$122K<0.01%new13F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\10,544$119K<0.01%-2,21413F-HRTimelineGroup
RHUMBLINE ADVISERS9,850$111K<0.01%-40013F-HRTimeline
CWM, LLCin group CWM, LLC9,772$111K<0.01%+9,48413F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…3,214$36.4K<0.01%+6813F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND3,000$34K<0.01%013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN2,589$29.3K<0.01%-4,93313F-HR/ATimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS2,354$26.6K<0.01%+86713F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…2,115$23.9K<0.01%+18513F-HRTimelineGroup
North Star Investment Management Corp.1,800$20.4K<0.01%013F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…1,644$18.6K<0.01%+25313F-HRTimelineGroup
Police & Firemen's Retirement System of…1,373$15.5K<0.01%013F-HRTimeline
Essential Partners LLC1,322$15K0.01%new13F-HRTimeline
TD Waterhouse Canada Inc.808$10.1K<0.01%+813F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…830$9.4K<0.01%+9013F-HRTimelineGroup
GAMMA Investing LLC737$8.34K<0.01%+63513F-HRTimeline
Versant Capital Management, Inc691$7.82K<0.01%new13F-HRTimeline
MAI Capital Management606$6.86K<0.01%+60113F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…598$6.77K<0.01%013F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc526$5.95K<0.01%013F-HRTimelineGroup
DUNCKER STREETT & CO INC437$4.95K<0.01%013F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…379$4.29K<0.01%new13F-HR/ATimelineGroup
CITIGROUP INCin group CITIGROUP INC308$3.49K<0.01%-29913F-HRTimelineGroup
Allworth Financial LP291$3.29K<0.01%+29013F-HRTimeline
Advisory Services Network, LLC245$2.77K<0.01%new13F-HRTimeline
Sterling Capital Management LLC220$2.49K<0.01%-23813F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.135$1.53K<0.01%-1,28213F-HRTimelineGroup
True Wealth Design, LLC99$1.12K<0.01%new13F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA104$1K<0.01%-12013F-HRTimelineGroup
Arax Advisory Partners86$974<0.01%new13F-HRTimeline
ROTHSCHILD INVESTMENT LLC72$815<0.01%+6613F-HRTimeline
Root Financial Partners, LLC63$713<0.01%new13F-HRTimeline
Keating Financial Advisory Services, In…63$713<0.01%013F-HRTimeline
Farther Finance Advisors, LLC54$683<0.01%new13F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.60$679<0.01%-5613F-HR/ATimelineGroup
IFP Advisors, Inc45$509<0.01%+513F-HRTimeline
Wealth Preservation Advisors, LLC44$498<0.01%new13F-HRTimeline
Bare Financial Services, Inc44$498<0.01%new13F-HRTimeline
NISA INVESTMENT ADVISORS, LLC40$453<0.01%new13F-HRTimeline
Fortitude Family Office, LLC39$441<0.01%new13F-HRTimeline
Basecamp Wealth Advisors LLC25$283<0.01%new13F-HRTimeline
SJS Investment Consulting Inc.22$250<0.01%new13F-HRTimeline
Sunbelt Securities, Inc.17$192<0.01%+1613F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…11$125<0.01%new13F-HRTimelineGroup
JPL Wealth Management, LLC2$23<0.01%new13F-HR/ATimeline
SBI Securities Co., Ltd.1$11<0.01%013F-HRTimeline