CUSIP: 00534A102 | NYSE | Healthcare · Biotechnology | Small Cap | 335 institutional holders
5%+ stakes reported outside the quarterly cycle. A 13D is due within five business days of the event below, so these figures lead the holders table until the filer's next 13F catches up to them.
| Holder | Shares | % of Class | Change | Event Date | vs 13F |
|---|---|---|---|---|---|
| 13G/ABVF Inc with BVF GP Holdings LLC, Biotechnology Value Fund L P, BVF I GP LLC, +4 more | 29,571,826 | 10.0% | New 5%+ stake | Jun 30, 2026 | No 13F filer matched |
| 13G/APerceptive Advisors LLC | 18,490,636 | 6.3% | New 5%+ stake | Jun 30, 2026 | No 13F filer matched |
| 13D/AAdimab, LLC | 20,262,170 | 7.3% | −192,320 | Dec 23, 2025 | No 13F filer matched |
| 13D/ATerrance McGuire with Polaris Venture Management Co. V, L.L.C., Jonathan Flint, Polaris Venture Partners V, L.P., +7 more | 7,008,590 | 3.0% | Newly reported | Aug 22, 2025 | No 13F filer matched |
| Style | Turnover | Location | Filed | ||||
|---|---|---|---|---|---|---|---|
| 161,989 | $141.0K | 0.0% | ETF | Low | Waltham, MA | 2026-11-02 | |
| 138,255 | $120.3K | 0.0% | ETF | Low | Morristown, NJ | 2026-10-26 | |
| 130,000 | $113.1K | 0.1% | Core | Low | Marshall, MI | 2026-10-20 | |
| 69,782 | $59.3K | 0.0% | Growth | Medium | Shanghai, France | 2026-10-28 | |
| 64,910 | $56.5K | 0.0% | Core | Very High | Chicago, IL | 2026-11-04 | |
| 37,752 | $32.8K | 0.0% | Growth | Low | Bethesda, MD | 2026-10-29 | |
| 22,568 | $19.6K | 0.0% | Index | Very Low | Overland Park, KS | 2026-11-02 | |
| 19,687 | $17.1K | 0.0% | Index | Very Low | Philadelphia, PA | 2026-11-03 | |
| 18,251 | $15.9K | 0.0% | Core | Medium | New York, NY | 2026-11-04 | |
| 17,496 | $15.2K | 0.0% | Index | Low | San Francisco, CA | 2026-11-03 | |
| 15,752 | $13.7K | 0.0% | Core | Medium | Baton Rouge, LA | 2026-10-19 | |
| 15,180 | $13.2K | 0.0% | GARP | Low | Toronto, South Africa | 2026-11-05 | |
| 15,063 | $13.1K | 0.0% | Growth | Low | Seoul, Malaysia | 2026-11-03 | |
| 11,555 | $10.1K | 0.0% | Core | Low | Des Moines, IA | 2026-11-02 | |
| 11,250 | $10 | 0.0% | ETF | Low | Fairfield, IA | 2026-11-02 | |
| 11,000 | $9.6K | 0.0% | Growth | Medium | Ann Arbor, MI | 2026-10-23 | |
| 10,076 | $7.1K | 0.0% | Core | Low | Plymouth, MN | 2026-10-13 | |
| 10,000 | $8.7K | 0.0% | ETF | Low | Buffalo, NY | 2026-10-19 | |
| 7,107 | $6.2K | 0.0% | Growth | Very High | Hong Kong, South Korea | 2026-10-29 | |
| 5,905 | $5.1K | 0.0% | Agg Growth | Medium | Guangzhou, France | 2026-10-26 | |
| 4,827 | $4.2K | 0.0% | Value | High | Cheyenne, WY | 2026-10-28 | |
| 4,357 | $3.8K | 0.0% | GARP | Medium | Charlotte, NC | 2026-10-22 | |
| 2,497 | $2.2K | 0.0% | ETF | Very Low | Sylvania, OH | 2026-10-26 | |
| 1,476 | $1.3K | 0.0% | Index | Very Low | Foster City, CA | 2026-10-08 | |
| 1,446 | $1.3K | 0.0% | Agg Growth | Low | Tokyo, Mexico | 2026-10-22 | |
| 1,428 | $1.2K | 0.0% | Index | Low | San Francisco, CA | 2026-10-08 | |
| 889 | $774 | 0.0% | Index | Very Low | St. Louis, MO | 2026-10-20 | |
| 319 | $277 | 0.0% | Core | Medium | Birmingham, AL | 2026-11-04 | |
| 248 | $216 | 0.0% | ETF | Medium | Encinitas, CA | 2026-10-21 | |
| 222 | $193 | 0.0% | Value | Medium | Rancho Santa Fe, CA | 2026-10-14 | |
| 155 | $135 | 0.0% | Growth | Low | Tampa, FL | 2026-10-16 |