Korro Bio, Inc.
KRRO- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001703647
In the last 90 days, Korro Bio, Inc. insiders filed 1 open-market purchase and 8 sales; 106 institutions reported holding it in 13F filings for Q2 2026, worth $190.1M in total; no superinvestor holds it.
13F holders, Q4 2025
Institutional positions in Korro Bio, Inc. as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 83
- −8 vs. Q3 2025
- Shares held
- 7.56M
- −1.83M (−19.5%) vs. Q3 2025
- Total value
- $60.6M
- −$387.3M (−86.5%) vs. Q3 2025
- New holders
- 22
- 24 more added
- Sold out
- 30
- 22 more reduced
1 institution that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting KRRO on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 106 | $190.1M |
| Q1 2026 | 99 | $144.8M |
| Q4 2025 | 83 | $60.6M |
| Q3 2025 | 92 | $465.5M |
| Q2 2025 | 71 | $114.8M |
| Q1 2025 | 75 | $169.0M |
| Q4 2024 | 84 | $359.6M |
| Q3 2024 | 71 | $285.3M |
| Q2 2024 | 64 | $285.7M |
| Q1 2024 | 49 | $618.6M |
| Q4 2023 | 40 | $301.5M |
| Q3 2023 | 42 | $2.58M |
| Q2 2023 | 41 | $1.67M |
| Q1 2023 | 43 | $2.52M |
| Q4 2022 | 50 | $28.3M |
| Q3 2022 | 55 | $14.1M |
| Q2 2022 | 58 | $13.0M |
| Q1 2022 | 86 | $33.1M |
| Q4 2021 | 84 | $90.2M |
| Q3 2021 | 88 | $130.4M |
| Q2 2021 | 91 | $193.9M |
| Q1 2021 | 115 | $186.6M |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Korro Bio, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| SBI Securities Co., Ltd. | 1 | $8 | 0.00% | 00.0% | Unchanged |
| Sunbelt Securities, Inc. | 1 | $8 | 0.00% | +1 | New |
| Allworth Financial LP | 1 | $9 | 0.00% | −91−98.9% | Reduced |
| Northwestern Mutual Wealth Management Co | 2 | $16 | 0.00% | 00.0% | Unchanged |
| MAI Capital Management | 5 | $41 | 0.00% | 00.0% | Unchanged |
| Rothschild Investment LLC | 6 | $48 | 0.00% | +6 | New |
| Global Retirement Partners, LLC | 35 | $280 | 0.00% | +35 | New |
| IFP Advisors, Inc | 40 | $320 | 0.00% | 00.0% | Unchanged |
| Keating Financial Advisory Services, Inc. | 63 | $505 | 0.00% | +63 | New |
| UBS Asset Management Americas Inc | 91 | $729 | 0.00% | +91 | New |
| GAMMA Investing LLC | 102 | $817 | 0.00% | +13+14.6% | Added |
| Optiver Holding B.V. | 116 | $929 | 0.00% | 00.0% | Unchanged |
| Royal Bank of Canada | 224 | $2.00K | 0.00% | −5,768−96.3% | Reduced |
| CWM, LLC | 288 | $2.00K | 0.00% | −2,405−89.3% | Reduced |
| Amalgamated Bank | 208 | $2.00K | 0.00% | −3−1.4% | Reduced |
| Federated Hermes, Inc. | 302 | $2.42K | 0.00% | +302 | New |
| California State Teachers Retirement System | 408 | $3.27K | 0.00% | −8−1.9% | Reduced |
| Duncker Streett & Co Inc | 437 | $3.50K | 0.00% | 00.0% | Unchanged |
| Sterling Capital Management LLC | 458 | $3.67K | 0.00% | 00.0% | Unchanged |
| Legal & General Group Plc | 526 | $4.21K | 0.00% | 00.0% | Unchanged |
| Ameritas Investment Partners, Inc. | 598 | $4.79K | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 607 | $4.86K | 0.00% | +270+80.1% | Added |
| The PNC Financial Services Group, Inc. | 740 | $5.93K | 0.00% | −2,174−74.6% | Reduced |
| TD Waterhouse Canada Inc. | 800 | $6.40K | 0.00% | +800 | New |
| Police & Firemen's Retirement System of New Jersey | 1,373 | $11.0K | 0.00% | −913−39.9% | Reduced |
| Tower Research Capital LLC (TRC) | 1,391 | $11.1K | 0.00% | +353+34.0% | Added |
| Advisor Group Holdings, Inc. | 1,417 | $11.3K | 0.00% | +1,137+406.1% | Added |
| BNP Paribas Arbitrage, SA | 1,487 | $11.9K | 0.00% | +173+13.2% | Added |
| Steward Partners Investment Advisory, LLC | 1,500 | $12.0K | 0.00% | −250−14.3% | Reduced |
| North Star Investment Management Corp. | 1,800 | $14.4K | 0.00% | 00.0% | Unchanged |
| Russell Investments Group, Ltd. | 1,930 | $15.5K | 0.00% | +1,115+136.8% | Added |
| JPMorgan Chase & Co | 2,838 | $22.7K | 0.00% | −196,411−98.6% | Reduced |
| New York State Common Retirement Fund | 3,000 | $24.0K | 0.00% | 00.0% | Unchanged |
| Mirae Asset Global ETFs Holdings Ltd. | 3,146 | $25.2K | 0.00% | +8+0.3% | Added |
| Group One Trading, L.P. | 4,000 | $32.0K | 0.00% | +4,000 | New |
| Bank of America Corp | 5,896 | $47.2K | 0.00% | +1,192+25.3% | Added |
| Wells Fargo & Company | 7,522 | $60.3K | 0.00% | +2,352+45.5% | Added |
| Quest Partners LLC | 7,703 | $61.7K | 0.00% | +5,235+212.1% | Added |
| Rhumbline Advisers | 10,250 | $82.1K | 0.00% | +907+9.7% | Added |
| Guggenheim Capital LLC | 10,439 | $83.6K | 0.00% | +10,439 | New |
| Jain Global LLC | 10,574 | $84.7K | 0.00% | +10,574 | New |
| American Century Companies Inc | 10,590 | $84.8K | 0.00% | +1,833+20.9% | Added |
| Two Sigma Advisers, LP | 11,237 | $90.0K | 0.00% | −172−1.5% | Reduced |
| Deutsche Bank AG | 12,758 | $102.2K | 0.00% | +9,027+241.9% | Added |
| Charles Schwab Investment Management Inc | 16,329 | $130.8K | 0.00% | −6,772−29.3% | Reduced |
| Bank of New York Mellon Corp | 18,855 | $151.0K | 0.00% | −458−2.4% | Reduced |
| Marshall Wace, LLP | 19,772 | $158.4K | 0.00% | +19,772 | New |
| UBS Group AG | 19,995 | $160.2K | 0.00% | −33,108−62.3% | Reduced |
| Raymond James Financial Inc | 23,031 | $184.5K | 0.00% | −125,940−84.5% | Reduced |
| Engineers Gate Manager LP | 26,885 | $215.3K | 0.00% | +26,885 | New |
| Quadrature Capital Ltd | 27,064 | $216.8K | 0.00% | +27,064 | New |
| Algert Global LLC | 27,065 | $216.8K | 0.00% | +19,957+280.8% | Added |
| Quantinno Capital Management LP | 27,597 | $221.1K | 0.00% | +21,454+349.2% | Added |
| Simplex Trading, LLC | 28,247 | $226.3K | 0.01% | +28,247 | New |
| AIHC Capital Management Ltd | 30,265 | $242.4K | 0.23% | +30,265 | New |
| Acadian Asset Management LLC | 33,790 | $270.0K | 0.00% | +33,790 | New |
| FMR LLC | 37,857 | $303.2K | 0.00% | −525,824−93.3% | Reduced |
| AQR Capital Management LLC | 40,647 | $325.6K | 0.00% | −7,760−16.0% | Reduced |
| Graham Capital Management, L.P. | 40,766 | $326.5K | 0.01% | +40,766 | New |
| Goldman Sachs Group Inc | 51,950 | $416.1K | 0.00% | +36,269+231.3% | Added |
| Northern Trust Corp | 55,640 | $445.7K | 0.00% | −1,633−2.9% | Reduced |
| XTX Topco Ltd | 57,067 | $457.1K | 0.01% | +13,529+31.1% | Added |
| Citadel Advisors LLC | 58,329 | $467.2K | 0.00% | −95,599−62.1% | Reduced |
| Emerald Mutual Fund Advisers Trust | 65,548 | $525.0K | 0.03% | +6,637+11.3% | Added |
| F/M Investments LLC | 65,548 | $525.0K | 0.02% | +10,303+18.6% | Added |
| Morgan Stanley | 69,728 | $558.5K | 0.00% | −97,766−58.4% | Reduced |
| Renaissance Technologies LLC | 74,900 | $599.9K | 0.00% | +34,500+85.4% | Added |
| Two Sigma Investments, LP | 78,984 | $632.7K | 0.00% | +14,529+22.5% | Added |
| State Street Corp | 146,221 | $1.17M | 0.00% | +21,652+17.4% | Added |
| Millennium Management LLC | 161,092 | $1.29M | 0.00% | −99,241−38.1% | Reduced |
| Geode Capital Management, LLC | 162,760 | $1.30M | 0.00% | −172−0.1% | Reduced |
| Susquehanna International Group, LLP | 196,827 | $1.58M | 0.00% | +196,827 | New |
| 72 Investment Holdings, LLC | 276,831 | $2.22M | 4.38% | 00.0% | Unchanged |
| Jane Street Group, LLC | 288,457 | $2.31M | 0.00% | +288,457 | New |
| Siren, L.L.C. | 347,718 | $2.79M | 0.08% | −71,115−17.0% | Reduced |
| TCG Crossover Management, LLC | 416,301 | $3.33M | 0.11% | 00.0% | Unchanged |
| BlackRock, Inc. | 457,399 | $3.66M | 0.00% | +10,701+2.4% | Added |
| Vanguard Group Inc | 489,639 | $3.92M | 0.00% | +93,980+23.8% | Added |
| Nantahala Capital Management, LLC | 600,000 | $4.81M | 0.29% | +600,000 | New |
| Lynx1 Capital Management LP | 677,915 | $5.43M | 1.10% | +677,915 | New |
| NEA Management Company, LLC | 1,090,793 | $8.74M | 0.45% | 00.0% | Unchanged |
| Atlas Venture Life Science Advisors, LLC | 1,137,149 | $9.11M | 1.05% | 00.0% | Unchanged |
| Los Angeles Capital Management LLC | 110 | – | – | +110 | New |
| Driehaus Capital Management LLC | 0 | $0 | 0.00% | −671,981−100.0% | Sold out |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −531,969−100.0% | Sold out |
| Cormorant Asset Management, LP | 0 | $0 | 0.00% | −465,000−100.0% | Sold out |
| Tri Locum Partners LP | 0 | $0 | 0.00% | −337,764−100.0% | Sold out |
| Polar Capital Holdings Plc | 0 | $0 | 0.00% | −264,694−100.0% | Sold out |
| Blue Owl Capital Holdings LP | 0 | $0 | 0.00% | −105,000−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −90,186−100.0% | Sold out |
| DAFNA Capital Management LLC | 0 | $0 | 0.00% | −60,804−100.0% | Sold out |
| Standard Life Aberdeen plc | 0 | $0 | 0.00% | −57,983−100.0% | Sold out |
| Woodline Partners LP | 0 | $0 | 0.00% | −50,094−100.0% | Sold out |
| ADAR1 Capital Management, LLC | 0 | $0 | 0.00% | −40,235−100.0% | Sold out |
| Trexquant Investment LP | 0 | $0 | 0.00% | −38,260−100.0% | Sold out |
| Rock Springs Capital Management LP | 0 | $0 | 0.00% | −35,719−100.0% | Sold out |
| OrbiMed Advisors LLC | 0 | $0 | 0.00% | −32,400−100.0% | Sold out |
| Eversept Partners, LP | 0 | $0 | 0.00% | −20,856−100.0% | Sold out |
| Emerald Advisers, LLC | 0 | $0 | 0.00% | −16,469−100.0% | Sold out |
| Blair William & Co | 0 | $0 | 0.00% | −9,750−100.0% | Sold out |