| Rank | Holder | SharesFloat % | Change | Date reported |
|---|---|---|---|---|
| 1 | RA Capital Management, LLC | 10.11M (17.91%) | -612.15K Decreased by -6.06% | Dec 31, 23 |
| 2 | Artisan Partners Limited Partnership | 5.75M (10.19%) | -246.18K Decreased by -4.28% | Dec 31, 23 |
| 3 | FMR Inc | 5.11M (9.06%) | -21.91K Decreased by -0.43% | Dec 31, 23 |
| 4 | Westfield Capital Management Company, LP | 4.03M (7.14%) | 228.46K Increased by +5.67% | Dec 31, 23 |
| 5 | HHG PLC | 3.99M (7.08%) | 140.25K Increased by +3.51% | Dec 31, 23 |
| 6 | T. Rowe Price Investment Management,Inc. | 3.99M (7.07%) | 5.33K Increased by +0.13% | Dec 31, 23 |
| 7 | venBio Select Advisor LLC | 3.76M (6.66%) | 85.56K Increased by +2.28% | Dec 31, 23 |
| 8 | Wellington Management Company LLP | 3.25M (5.76%) | -28.88K Decreased by -0.89% | Dec 31, 23 |
| 9 | Capital Research & Mgmt Co - Division 3 | 2.18M (3.87%) | 12.82K Increased by +0.59% | Dec 31, 23 |
| 10 | Massachusetts Financial Services Company | 1.52M (2.69%) | 254.75K Increased by +16.77% | Dec 31, 23 |
| 11 | T. Rowe Price Associates, Inc. | 1.44M (2.56%) | -192.9K Decreased by -13.35% | Dec 31, 23 |
| 12 | Franklin Resources Inc | 1.06M (1.89%) | -148.48K Decreased by -13.94% | Dec 31, 23 |
| 13 | Amvescap Plc. | 907.91K (1.61%) | 235.78K Increased by +25.97% | Dec 31, 23 |
| 14 | Goldman Sachs Group Inc | 845.71K (1.5%) | 435.74K Increased by +51.52% | Dec 31, 23 |
| 15 | TimesSquare Capital Management, LLC | 792.95K (1.41%) | -49.86K Decreased by -6.29% | Dec 31, 23 |
| 16 | Sofinnova Ventures | 754.03K (1.34%) | 0 Increased by 0% | Dec 31, 23 |
| 17 | Putnam Investments LLC | 725.65K (1.29%) | -46.71K Decreased by -6.44% | Dec 31, 23 |
| 18 | Putnam Investments, LLC., a Franklin Templeton company | 725.65K (1.29%) | -46.71K Decreased by -6.44% | Dec 31, 23 |
| 19 | Brown Advisory Holdings Inc | 684.07K (1.21%) | 178.13K Increased by +26.04% | Mar 31, 24 |
| 20 | Vestal Point Capital LP | 625K (1.11%) | 625K Increased by +100% | Dec 31, 23 |
| Rank | Holder | SharesFloat % | Change | Date reported |
|---|---|---|---|---|
| 1 | TimesSquare CIT Mid Cap Growth A | 9.14M (16.2%) | 9.09M Increased by +99.45% | Dec 31, 23 |
| 2 | Vanguard Health Care Inv | 2.14M (3.79%) | 499.68K Increased by +23.39% | Dec 31, 23 |
| 3 | MFS Mid Cap Growth Equity | 1.17M (2.08%) | 205.41K Increased by +17.51% | Dec 31, 23 |
| 4 | MFS Mid Cap Growth A | 1.17M (2.07%) | 0 Increased by 0% | Mar 31, 24 |
| 5 | Artisan Mid Cap Investor | 1.09M (1.93%) | -26.78K Decreased by -2.45% | Mar 31, 24 |
| 6 | Artisan U.S. Mid-Cap Growth | 1.09M (1.93%) | -26.78K Decreased by -2.45% | Mar 31, 24 |
| 7 | American Funds Growth Fund of Amer A | 1.06M (1.89%) | 0 Increased by 0% | Mar 31, 24 |
| 8 | Capital Group Growth Fnd of Amer Comp | 1.06M (1.89%) | 0 Increased by 0% | Dec 31, 23 |
| 9 | Janus Inst Mid Cap Growth CF | 1.04M (1.85%) | 52.56K Increased by +5.04% | Dec 31, 23 |
| 10 | Janus Henderson Enterprise D | 1.01M (1.79%) | -35.66K Decreased by -3.54% | Feb 29, 24 |
| 11 | Fidelity Select Health Care | 820K (1.45%) | -50K Decreased by -6.1% | Feb 29, 24 |
| 12 | T. Rowe Price Mid-Cap Growth | 748.9K (1.33%) | -393K Decreased by -52.48% | Mar 31, 24 |
| 13 | T. Rowe Price US Mid-Cap Growth Equity | 748.9K (1.33%) | -393K Decreased by -52.48% | Mar 31, 24 |
| 14 | T. Rowe Price New Horizons | 734.35K (1.3%) | -41.8K Decreased by -5.69% | Mar 31, 24 |
| 15 | US Small-Cap Growth II Equity Comp | 734.35K (1.3%) | -41.8K Decreased by -5.69% | Mar 31, 24 |
| 16 | Fidelity Select Biotechnology | 659.41K (1.17%) | 0 Increased by 0% | Feb 29, 24 |
| 17 | Fidelity® Select Biotechnology | 659.41K (1.17%) | 0 Increased by 0% | Nov 30, 23 |
| 18 | Artisan International Investor | 641.29K (1.14%) | -86.03K Decreased by -13.42% | Sep 30, 23 |
| 19 | T. Rowe Price Health Sciences | 617.71K (1.09%) | 298.51K Increased by +48.32% | Mar 31, 24 |
| 20 | Artisan Small Cap Investor | 590.25K (1.05%) | -32.35K Decreased by -5.48% | Dec 31, 23 |