KRRO Korro Bio, Inc.
Korro Bio, Inc. (KRRO) Institutional Ownership
What the institutions did with KRRO last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| Lynx1 Capital Management LP | 1.5M | 10.2% |
| Nantahala Capital Management, LLC | 1.3M | 8.8% |
| NEA Management Company, LLC | 1.3M | 8.6% |
| Venrock Adviser, LLC | 1.0M | 6.7% |
| Atlas Venture Life Science Advisors, LLC | 962.9K | 6.4% |
| Balyasny Asset Management L.P. | 951.8K | 6.3% |
| BlackRock, Inc. | 817.6K | 5.4% |
| Affinity Asset Advisors, LLC | 706.9K | 4.7% |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 541.0K | 3.6% |
| ADAR1 Capital Management, LLC | 540.1K | 3.6% |
| VANGUARD CAPITAL MANAGEMENT LLC | 454.8K | 3.0% |
| Driehaus Capital Management LLC | 450.0K | 3.0% |
| TCG Crossover Management, LLC | 416.3K | 2.8% |
| Kalehua Capital Management LLC | 405.0K | 2.7% |
| Siren, L.L.C. | 347.7K | 2.3% |
| AQR CAPITAL MANAGEMENT LLC | 299.0K | 2.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 296.9K | 2.0% |
| 72 Investment Holdings, LLC | 276.8K | 1.8% |
| STATE STREET CORP | 232.6K | 1.5% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 223.6K | 1.5% |
| TWO SIGMA INVESTMENTS, LP | 178.1K | 1.2% |
| JPMORGAN CHASE & CO | 124.7K | 0.8% |
| MILLENNIUM MANAGEMENT LLC | 118.4K | 0.8% |
| GOLDMAN SACHS GROUP INC | 117.0K | 0.8% |
| RENAISSANCE TECHNOLOGIES LLC | 110.5K | 0.7% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Nantahala Capital Management, LLC | Increased | 660.0K | 1.3M | +660.0K |
| BlackRock, Inc. | Increased | 460.0K | 817.6K | +357.6K |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Increased | 228.4K | 541.0K | +312.6K |
| Kalehua Capital Management LLC | Increased | 109.4K | 405.0K | +295.7K |
| Atlas Venture Life Science Advisors, LLC | Reduced | 1.1M | 962.9K | -174.3K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 310.9K | 454.8K | +143.9K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 173.6K | 296.9K | +123.2K |
| JANE STREET GROUP, LLC | Sold Out | 115.7K | 0 | -115.7K |
| STATE STREET CORP | Increased | 140.3K | 232.6K | +92.2K |
| Balyasny Asset Management L.P. | Reduced | 1.0M | 951.8K | -88.3K |
| UBS Group AG | Increased | 21.7K | 105.5K | +83.8K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 148.6K | 223.6K | +75.0K |
| GOLDMAN SACHS GROUP INC | Increased | 50.5K | 117.0K | +66.4K |
| JPMORGAN CHASE & CO | Increased | 68.5K | 124.7K | +56.2K |
| MILLENNIUM MANAGEMENT LLC | Increased | 63.6K | 118.4K | +54.8K |
| Walleye Capital LLC | New | 0 | 54.3K | +54.3K |
| BANK OF AMERICA CORP /DE/ | New | 0 | 51.7K | +51.7K |
| Trexquant Investment LP | Reduced | 56.2K | 11.5K | -44.7K |
| D. E. Shaw & Co., Inc. | New | 0 | 34.2K | +34.2K |
| Jump Financial, LLC | New | 0 | 33.9K | +33.9K |
| VANGUARD FIDUCIARY TRUST CO | Increased | 41.5K | 74.9K | +33.4K |
| AQR CAPITAL MANAGEMENT LLC | Increased | 267.8K | 299.0K | +31.2K |
| NORTHERN TRUST CORP | Increased | 57.7K | 88.1K | +30.4K |
| ACADIAN ASSET MANAGEMENT LLC | Reduced | 41.8K | 14.5K | -27.3K |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 136.2K | 110.5K | -25.7K |
| PANAGORA ASSET MANAGEMENT INC | New | 0 | 25.6K | +25.6K |
| BNP PARIBAS FINANCIAL MARKETS | Increased | 2.4K | 26.3K | +23.9K |
| Quadrature Capital Ltd | Sold Out | 20.4K | 0 | -20.4K |
| MORGAN STANLEY | Reduced | 41.1K | 22.5K | -18.6K |
| HSBC HOLDINGS PLC | New | 0 | 17.8K | +17.8K |
| PRICE T ROWE ASSOCIATES INC /MD/ | New | 0 | 17.6K | +17.6K |
| Quantinno Capital Management LP | Increased | 36.0K | 52.7K | +16.7K |
| Nuveen, LLC | New | 0 | 15.9K | +15.9K |
| MARSHALL WACE, LLP | Reduced | 34.3K | 19.1K | -15.3K |
| Engineers Gate Manager LP | Reduced | 23.7K | 10.2K | -13.5K |
| MERCER GLOBAL ADVISORS INC /ADV | New | 0 | 12.9K | +12.9K |
| XTX Topco Ltd | Reduced | 60.5K | 47.8K | -12.7K |
| TWO SIGMA INVESTMENTS, LP | Increased | 165.5K | 178.1K | +12.6K |
| ALLIANCEBERNSTEIN L.P. | New | 0 | 12.2K | +12.2K |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | New | 0 | 11.5K | +11.5K |
| DIMENSIONAL FUND ADVISORS LP | New | 0 | 11.4K | +11.4K |
| Cerity Partners LLC | New | 0 | 10.8K | +10.8K |
| HRT FINANCIAL LP | Sold Out | 10.8K | 0 | -10.8K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Increased | 13.4K | 24.1K | +10.7K |
| AMERICAN CENTURY COMPANIES INC | New | 0 | 10.2K | +10.2K |
| Bank of New York Mellon Corp | Increased | 21.7K | 31.7K | +10.0K |
| CITADEL ADVISORS LLC | Increased | 30.9K | 40.4K | +9.5K |
| IEQ CAPITAL, LLC | Increased | 12.8K | 21.2K | +8.5K |
| WELLS FARGO & COMPANY/MN | Increased | 2.6K | 9.6K | +7.0K |
| BOOTHBAY FUND MANAGEMENT, LLC | Reduced | 42.0K | 35.9K | -6.1K |
| RAYMOND JAMES FINANCIAL INC | Increased | 42.8K | 48.9K | +6.1K |
| Susquehanna Portfolio Strategies, LLC | Reduced | 19.1K | 13.5K | -5.6K |
| Arax Advisory Partners | Increased | 86 | 5.6K | +5.5K |
| DEUTSCHE BANK AG\ | Increased | 10.5K | 15.9K | +5.4K |
| ALGERT GLOBAL LLC | Reduced | 19.2K | 14.2K | -5.0K |
| CITIGROUP INC | Increased | 308 | 5.2K | +4.9K |
| GUGGENHEIM CAPITAL LLC | Increased | 14.1K | 18.4K | +4.3K |
| Police & Firemen's Retirement System of New Jersey | Increased | 1.4K | 4.6K | +3.3K |
| Russell Investments Group, Ltd. | Increased | 2.1K | 4.9K | +2.8K |
| RHUMBLINE ADVISERS | Increased | 9.9K | 12.4K | +2.6K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.