| Rank | Holder | SharesFloat % | Change | Date reported |
|---|---|---|---|---|
| 1 | RA Capital Management, LLC | 10.11M (16.88%) | 402.32K Increased by +3.98% | Dec 31, 24 |
| 2 | Westfield Capital Management Company, L.P. | 5.53M (9.23%) | 394.47K Increased by +7.14% | Dec 31, 24 |
| 3 | Westfield Capital Management Company, LP | 5.13M (8.57%) | 170.94K Increased by +3.33% | Sep 30, 24 |
| 4 | venBio Select Advisor LLC | 5.10M (8.52%) | 114.17K Increased by +2.24% | Dec 31, 24 |
| 5 | FMR Inc | 4.73M (7.89%) | -179.20K Decreased by -3.79% | Dec 31, 24 |
| 6 | Artisan Partners Limited Partnership | 4.45M (7.43%) | 39.31K Increased by +0.88% | Dec 31, 24 |
| 7 | HHG PLC | 4.38M (7.31%) | 193.69K Increased by +4.42% | Dec 31, 24 |
| 8 | Capital Research & Mgmt Co - Division 3 | 2.86M (4.78%) | 753.86K Increased by +26.33% | Dec 31, 24 |
| 9 | T. Rowe Price Investment Management,Inc. | 2.73M (4.55%) | 960.50K Increased by +35.24% | Dec 31, 24 |
| 10 | T. Rowe Price Associates, Inc. | 2.28M (3.81%) | 162.08K Increased by +7.10% | Dec 31, 24 |
| 11 | Massachusetts Financial Services Company | 1.87M (3.12%) | 565.00 Increased by +0.03% | Dec 31, 24 |
| 12 | Franklin Resources Inc | 1.36M (2.26%) | -103.31K Decreased by -7.62% | Dec 31, 24 |
| 13 | Amvescap Plc. | 1.16M (1.93%) | -6.23K Decreased by -0.54% | Dec 31, 24 |
| 14 | Citadel Advisors Llc | 895.98K (1.50%) | 232.06K Increased by +25.90% | Dec 31, 24 |
| 15 | Morgan Stanley - Brokerage Accounts | 825.76K (1.38%) | 513.27K Increased by +62.16% | Dec 31, 24 |
| 16 | Adage Capital Partners Gp LLC | 820.51K (1.37%) | 611.00K Increased by +74.47% | Jun 30, 24 |
| 17 | Camber Capital Management LLC | 800.00K (1.34%) | 100.00K Increased by +12.50% | Dec 31, 24 |
| 18 | Vestal Point Capital LP | 750.00K (1.25%) | 225.00K Increased by +30.00% | Jun 30, 24 |
| 19 | Sofinnova Ventures | 734.28K (1.23%) | -19.75K Decreased by -2.69% | Jun 30, 24 |
| 20 | Fidelity International Ltd | 729.27K (1.22%) | 89.02K Increased by +12.21% | Dec 31, 24 |
| Rank | Holder | SharesFloat % | Change | Date reported |
|---|---|---|---|---|
| 1 | TimesSquare CIT Mid Cap Growth A | 9.14M (15.26%) | 9.09M Increased by +99.45% | Dec 31, 23 |
| 2 | MFS Mid Cap Growth A | 1.30M (2.18%) | 0.00 Increased by 0.00% | Mar 31, 25 |
| 3 | MFS Mid Cap Growth Equity | 1.30M (2.18%) | -14.22K Decreased by -1.09% | Mar 31, 25 |
| 4 | Capital Group Growth Fnd of Amer Comp | 1.06M (1.78%) | 0.00 Increased by 0.00% | Dec 31, 24 |
| 5 | American Funds Growth Fund of Amer A | 1.06M (1.77%) | -1.77K Decreased by -0.17% | Mar 31, 25 |
| 6 | T. Rowe Price Mid-Cap Growth | 1.02M (1.70%) | -1.20K Decreased by -0.12% | Mar 31, 25 |
| 7 | T. Rowe Price US Mid-Cap Growth Equity | 1.02M (1.70%) | -1.60K Decreased by -0.16% | Mar 31, 25 |
| 8 | Janus Henderson Enterprise D | 976.88K (1.63%) | 0.00 Increased by 0.00% | Feb 28, 25 |
| 9 | Janus Inst Mid Cap Growth CF | 976.88K (1.63%) | 0.00 Increased by 0.00% | Dec 31, 24 |
| 10 | T. Rowe Price Health Sciences | 948.31K (1.58%) | 69.89K Increased by +7.37% | Mar 31, 25 |
| 11 | Artisan Mid Cap Investor | 938.85K (1.57%) | -29.92K Decreased by -3.19% | Mar 31, 25 |
| 12 | Artisan U.S. Mid-Cap Growth | 938.85K (1.57%) | -29.92K Decreased by -3.19% | Mar 31, 25 |
| 13 | Fidelity Select Health Care | 750.00K (1.25%) | 0.00 Increased by 0.00% | Feb 28, 25 |
| 14 | Fidelity Select Biotechnology | 659.41K (1.10%) | 0.00 Increased by 0.00% | Feb 28, 25 |
| 15 | Fidelity® Select Biotechnology | 659.41K (1.10%) | 0.00 Increased by 0.00% | Nov 30, 23 |
| 16 | T. Rowe Price New Horizons | 634.82K (1.06%) | -8.59K Decreased by -1.35% | Mar 31, 25 |
| 17 | US Small-Cap Growth II Equity Comp | 634.82K (1.06%) | -8.77K Decreased by -1.38% | Mar 31, 25 |
| 18 | CTIVP Westfield Slct LgCap Gro 1 | 631.98K (1.06%) | 0.00 Increased by 0.00% | Mar 31, 25 |
| 19 | Capital Group New Perspective Comp | 624.03K (1.04%) | 624.03K Increased by +100.00% | Dec 31, 24 |
| 20 | American Funds New Perspective A | 623.16K (1.04%) | -866.00 Decreased by -0.14% | Mar 31, 25 |