| Rank | Holder | SharesFloat % | Change | Date reported |
|---|---|---|---|---|
| 1 | FMR Inc | 11.70M (17.95%) | 2.77M Increased by +23.69% | Mar 31, 26 |
| 2 | Baker Bros Advisors LP | 8.66M (13.28%) | 0.00 Increased by 0.00% | Mar 31, 26 |
| 3 | venBio Select Advisor LLC | 7.47M (11.47%) | 0.00 Increased by 0.00% | Mar 31, 26 |
| 4 | Vanguard Group Inc | 6.27M (9.62%) | 845.92K Increased by +13.50% | Dec 31, 25 |
| 5 | T. Rowe Price Associates, Inc. | 6.06M (9.30%) | -98.49K Decreased by -1.62% | Mar 31, 26 |
| 6 | Bvf Inc | 5.50M (8.44%) | 0.00 Increased by 0.00% | Mar 31, 26 |
| 7 | T. Rowe Price Investment Management,Inc. | 5.46M (8.39%) | 4.74M Increased by +86.70% | Mar 31, 26 |
| 8 | BlackRock Inc | 5.06M (7.77%) | 56.78K Increased by +1.12% | Mar 31, 26 |
| 9 | Atlas Venture Life Science Advisors, LLC | 4.58M (7.02%) | -81.87K Decreased by -1.79% | Mar 31, 26 |
| 10 | Wellington Management Company LLP | 3.89M (5.97%) | -523.25K Decreased by -13.45% | Mar 31, 26 |
| 11 | Siren, L.L.C. | 3.19M (4.89%) | -100.00K Decreased by -3.14% | Mar 31, 26 |
| 12 | Artal Group S A | 3.01M (4.61%) | -21.52K Decreased by -0.72% | Jun 30, 24 |
| 13 | Vanguard Capital Management, LLC | 2.88M (4.42%) | 2.88M Increased by +100.00% | Mar 31, 26 |
| 14 | Vanguard Portfolio Management, LLC | 2.87M (4.41%) | 2.87M Increased by +100.00% | Mar 31, 26 |
| 15 | State Street Corporation | 2.67M (4.10%) | 778.24K Increased by +29.12% | Mar 31, 24 |
| 16 | State Street Corp | 2.39M (3.67%) | 179.93K Increased by +7.53% | Mar 31, 26 |
| 17 | Capital Research Global Investors | 1.67M (2.57%) | 112.48K Increased by +6.72% | Mar 31, 26 |
| 18 | Geode Capital Management, LLC | 1.65M (2.52%) | 227.96K Increased by +13.85% | Mar 31, 26 |
| 19 | Driehaus Capital Management LLC | 1.04M (1.60%) | -25.66K Decreased by -2.46% | Mar 31, 26 |
| 20 | UBS Group AG | 1.02M (1.57%) | 286.82K Increased by +28.01% | Mar 31, 26 |
| Rank | Holder | SharesFloat % | Change | Date reported |
|---|---|---|---|---|
| 1 | Fidelity Growth Compy Commingled Pl S | 2.85M (4.38%) | 16.28K Increased by +0.57% | Apr 30, 26 |
| 2 | Fidelity Growth Compy Commingled Pl O | 2.24M (3.43%) | 52.60K Increased by +2.35% | Aug 31, 24 |
| 3 | Fidelity Growth Company Fund | 2.14M (3.28%) | 56.90K Increased by +2.66% | Apr 30, 26 |
| 4 | Vanguard Total Stock Mkt Idx Inv | 2.09M (3.21%) | 6.17K Increased by +0.30% | Apr 30, 26 |
| 5 | US Small-Cap Growth II Equity Comp | 1.95M (2.99%) | -18.26K Decreased by -0.94% | Mar 31, 26 |
| 6 | T. Rowe Price New Horizons | 1.95M (2.99%) | -873.00 Decreased by -0.04% | Apr 30, 26 |
| 7 | Vanguard Health Care Inv | 1.80M (2.76%) | -375.38K Decreased by -20.90% | Mar 31, 26 |
| 8 | Vanguard US Total Market Shares ETF | 1.54M (2.37%) | 1.91K Increased by +0.12% | Sep 30, 24 |
| 9 | Vanguard Small Cap Index | 1.50M (2.31%) | -3.27K Decreased by -0.22% | Apr 30, 26 |
| 10 | American Funds SMALLCAP World A | 1.49M (2.28%) | 97.27K Increased by +6.55% | Mar 31, 26 |
| 11 | iShares Russell 2000 ETF | 1.37M (2.11%) | 12.69K Increased by +0.92% | May 29, 26 |
| 12 | State Street® SPDR® S&P® Biotech ETF | 1.15M (1.77%) | -7.08K Decreased by -0.62% | May 31, 26 |
| 13 | T. Rowe Price Health Sciences | 1.07M (1.64%) | 0.00 Increased by 0.00% | Apr 30, 26 |
| 14 | T. Rowe Price New Horizons Tr-A | 901.33K (1.38%) | 55.81K Increased by +6.19% | Mar 31, 26 |
| 15 | T. Rowe Price New Horizons Tr-Z | 872.24K (1.34%) | 65.62K Increased by +7.52% | Mar 31, 25 |
| 16 | Vanguard Small Cap Growth Index Inv | 845.04K (1.30%) | 2.86K Increased by +0.34% | Apr 30, 26 |
| 17 | T. Rowe Price US Small-Cap Core Equity | 790.95K (1.21%) | 550.29K Increased by +69.57% | Mar 31, 26 |
| 18 | T. Rowe Price Small-Cap Stock | 790.39K (1.21%) | -563.00 Decreased by -0.07% | Apr 30, 26 |
| 19 | Vanguard Institutional Extnd Mkt Idx Tr | 694.71K (1.07%) | 8.29K Increased by +1.19% | Apr 30, 26 |
| 20 | Vanguard Explorer Inv | 644.11K (0.99%) | -516.00 Decreased by -0.08% | Mar 31, 26 |