Korro BioKRRO
13F holders, Q4 2025 (December 31)83holders −9
20new positions
30sold out
4famous investors
$8.01avg. 13F price*
At the end of Q4 2025, 83 institutions reported holding Korro Bio Inc. (KRRO) in their 13F filings, down 9 from Q3 2025. 20 opened new positions and 30 sold out. The largest holders were Atlas Venture Life Science Advisors, LLC ($9.1M), NEA Management Company, LLC ($8.7M) and Lynx1 Capital Management LP ($5.4M). 4 famous investors held it, including Israel Englander (0.0% of Millennium Management's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Korro Bio Inc.
- CUSIP
- 500946108
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 20 | $15.8M |
| Exits | 30 | $137.2M |
All 13F filers, Q3 2025 → Q4 2025: 2,273,207 shares bought and 4,137,589 shares sold, net −1,864,382 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 83 holders
| Atlas Venture Life Science Advisors, LLC | 1.05% | No change | 1,137,149 | $9.1M |
| NEA Management Company, LLC | 0.45% | No change | 1,090,793 | $8.7M |
| Lynx1 Capital Management LP | 1.10% | New | 677,915 | $5.4M |
| Nantahala Capital Management, LLC | 0.29% | New | 600,000 | $4.8M |
| Vanguard Group Inc. | 0.00% | Add +23.8% | 489,639 | $3.9M |
| BlackRock, Inc. | 0.00% | Add +2.4% | 457,399 | $3.7M |
| TCG Crossover Management, LLC | 0.11% | No change | 416,301 | $3.3M |
| Siren, L.L.C. | 0.08% | Reduce -17.0% | 347,718 | $2.8M |
| Jane Street Group, LLC | 0.00% | New | 288,457 | $2.3M |
| 72 Investment Holdings, LLC | 4.38% | No change | 276,831 | $2.2M |
| Susquehanna International Group, LLP | 0.00% | New | 196,827 | $1.6M |
| Geode Capital Management, LLC | 0.00% | Reduce -0.1% | 162,760 | $1.3M |
| Millennium Management | 0.00% | Reduce -38.1% | 161,092 | $1.3M |
| State Street Corp. | 0.00% | Add +17.4% | 146,221 | $1.2M |
| Two Sigma Investments, LP | 0.00% | Add +22.5% | 78,984 | $633K |
| Renaissance Technologies | 0.00% | Add +85.4% | 74,900 | $600K |
| Morgan Stanley | 0.00% | Reduce -58.4% | 69,728 | $559K |
| Emerald Mutual Fund Advisers Trust | 0.03% | Add +11.3% | 65,548 | $525K |
| F/m Investments LLC | 0.02% | Add +18.6% | 65,548 | $525K |
| Citadel Advisors | 0.00% | Reduce -62.1% | 58,329 | $467K |
| XTX Topco Ltd | 0.01% | Add +31.1% | 57,067 | $457K |
| Northern Trust Corp. | 0.00% | Reduce -2.9% | 55,640 | $446K |
| Goldman Sachs Group Inc. | 0.00% | Add +231.3% | 51,950 | $416K |
| Graham Capital Management, L.P. | 0.02% | New | 40,766 | $327K |
| AQR Capital Management | 0.00% | Reduce -16.0% | 40,647 | $326K |
| FMR LLC | 0.00% | Reduce -93.3% | 37,857 | $303K |
| Acadian Asset Management LLC | 0.00% | New | 33,790 | $270K |
| AIHC Capital Management Ltd | 0.23% | — | 30,265 | $242K |
| Simplex Trading, LLC | 0.01% | New | 28,247 | $226K |
| Quantinno Capital Management LP | 0.00% | Add +349.2% | 27,597 | $221K |
| Algert Global LLC | 0.00% | Add +280.8% | 27,065 | $217K |
| Quadrature Capital Ltd | 0.00% | New | 27,064 | $217K |
| Engineers Gate Manager LP | 0.00% | New | 26,885 | $215K |
| Raymond James Financial Inc. | 0.00% | Reduce -84.5% | 23,031 | $184K |
| UBS Group AG | 0.00% | Reduce -62.4% | 19,995 | $160K |
| Marshall Wace, LLP | 0.00% | New | 19,772 | $158K |
| Bank of New York Mellon Corp | 0.00% | Reduce -2.4% | 18,855 | $151K |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -29.3% | 16,329 | $131K |
| Deutsche Bank AG | 0.00% | Add +241.9% | 12,758 | $102K |
| Two Sigma Advisers, LP | 0.00% | Reduce -1.5% | 11,237 | $90K |
| American Century Companies Inc. | 0.00% | Add +20.9% | 10,590 | $85K |
| Jain Global LLC | 0.00% | New | 10,574 | $85K |
| Guggenheim Capital LLC | 0.00% | New | 10,439 | $84K |
| Rhumbline Advisers | 0.00% | Add +9.7% | 10,250 | $82K |
| AlphaQuest LLC | 0.00% | Add +212.1% | 7,703 | $62K |
| Wells Fargo & Company | 0.00% | Add +45.5% | 7,522 | $60K |
| Bank of America Corp. | 0.00% | Add +25.3% | 5,896 | $47K |
| Group One Trading LLC | 0.00% | New | 4,000 | $32K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +0.3% | 3,146 | $25K |
| New York State Common Retirement Fund | 0.00% | No change | 3,000 | $24K |
| JPMorgan Chase & Co. | 0.00% | Reduce -98.6% | 2,838 | $23K |
| Russell Investments Group, Ltd. | 0.00% | Add +136.8% | 1,930 | $15K |
| North Star Investment Management Corp. | 0.00% | No change | 1,800 | $14K |
| Steward Partners Investment Advisory, LLC | 0.00% | Reduce -14.3% | 1,500 | $12K |
| BNP Paribas Financial Markets | 0.00% | Add +13.2% | 1,487 | $12K |
| Osaic Holdings, Inc. | 0.00% | Add +406.1% | 1,417 | $11K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +34.0% | 1,391 | $11K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | Reduce -39.9% | 1,373 | $11K |
| TD Waterhouse Canada Inc. | 0.00% | New | 800 | $6K |
| PNC Financial Services Group, Inc. | 0.00% | Reduce -74.6% | 740 | $6K |
| Citigroup Inc. | 0.00% | Add +80.1% | 607 | $5K |
| Ameritas Investment Partners, Inc. | 0.00% | No change | 598 | $5K |
| Legal & General Group Plc | 0.00% | No change | 526 | $4K |
| Los Angeles Capital Management LLC | 0.00% | New | 110 | $4K |
| Sterling Capital Management LLC | 0.00% | No change | 458 | $4K |
| Duncker Streett & Co. Inc. | 0.00% | No change | 437 | $4K |
| California State Teachers Retirement System | 0.00% | Reduce -1.9% | 408 | $3K |
| Federated Hermes, Inc. | 0.00% | New | 302 | $2K |
| Amalgamated Bank | 0.00% | Reduce -1.4% | 208 | $2K |
| Royal Bank of Canada | 0.00% | Reduce -96.3% | 224 | $2K |
| Cwm, LLC | 0.00% | Reduce -89.3% | 288 | $2K |
| Optiver Holding B.V. | 0.00% | No change | 116 | $929 |
| GAMMA Investing LLC | 0.00% | Add +14.6% | 102 | $817 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | New | 91 | $729 |
| Keating Financial Advisory Services, Inc. | 0.00% | — | 63 | $505 |
| IFP Advisors, Inc | 0.00% | No change | 40 | $320 |
| Global Retirement Partners, LLC | 0.00% | New | 35 | $280 |
| Rothschild Investment LLC | 0.00% | New | 6 | $48 |
| MAI Capital Management | 0.00% | No change | 5 | $41 |
| Northwestern Mutual Wealth Management Co. | 0.00% | No change | 2 | $16 |
| Allworth Financial LP | 0.00% | Reduce -98.9% | 1 | $9 |
| Sunbelt Securities, Inc. | 0.00% | New | 1 | $8 |
| SBI Securities Co., Ltd. | 0.00% | No change | 1 | $8 |
"% of holder's portfolio" is KRRO's weight in each manager's 13F, not the share of Korro Bio Inc. the manager owns.