Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
161 institutional managers reported holding AMLX for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 61%. 22 opened new positions; 35 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| FMR (Fidelity) | 16.63M | 15.04% | $231.2M | added +0.7% | 2022 Q1 |
| BlackRock | 8.83M | 7.99% | $122.7M | trimmed -2.5% | 2022 Q1 |
| Perceptive Advisors LLC | 8.28M | 7.49% | $115.2M | unchanged | 2022 Q1 |
| TCG Crossover Management, LLC (focused) | 6.24M | 5.65% | $86.8M | unchanged | 2024 Q3 |
| Vanguard Group | 5.81M | 5.25% | $80.7M | unchanged | 2022 Q1 |
| Commodore Capital LP (focused) | 5.65M | 5.11% | $78.5M | unchanged | 2025 Q3 |
| Janus Henderson | 4.99M | 4.51% | $69.3M | added +11.6% | 2025 Q3 |
| Saturn V Capital Management LP (focused) | 4.35M | 3.93% | $60.5M | trimmed -3.3% | 2024 Q4 |
| Adage Capital Partners GP, L.l.c. | 3.56M | 3.22% | $49.5M | added +28.2% | 2025 Q1 |
| First Light Asset Management, LLC (focused) | 3.19M | 2.89% | $44.3M | trimmed -4.9% | 2025 Q3 |
| Driehaus Capital Management LLC | 2.99M | 2.70% | $41.5M | trimmed -3.9% | 2025 Q2 |
| Goldman Sachs | 2.63M | 2.38% | $36.5M | unchanged | 2022 Q3 |
| State Street | 2.36M | 2.14% | $32.8M | added +14.2% | 2022 Q1 |
| Franklin Resources | 2.26M | 2.04% | $31.4M | added +88.4% | 2025 Q4 |
| Geode Capital | 2.21M | 2.00% | $30.7M | added +2.1% | 2022 Q1 |
| Morgan Stanley | 2.18M | 1.97% | $30.2M | trimmed -7.8% | 2022 Q1 |
| Almitas Capital LLC | 2.12M | 1.92% | $29.5M | unchanged | 2024 Q2 |
| Great Point Partners LLC (focused) | 1.75M | 1.58% | $24.3M | unchanged | 2025 Q1 |
| Jones Hill Capital LP (focused) | 1.60M | 1.45% | $22.2M | opened | 2026 Q1 |
| 683 Capital Management, LLC | 1.53M | 1.38% | $21.3M | trimmed -7.3% | 2024 Q2 |
| Eventide Asset Management, LLC | 1.51M | 1.37% | $21.0M | unchanged | 2025 Q3 |
| Bank OF America CORP /DE/ | 1.33M | 1.20% | $18.5M | unchanged | 2022 Q1 |
| Deutsche Bank AG\ | 1.27M | 1.15% | $17.6M | trimmed -4.9% | 2022 Q1 |
| Siren, L.l.c. | 1.23M | 1.11% | $17.1M | opened | 2026 Q1 |
| Balyasny Asset Management | 1.11M | 1.00% | $15.4M | added +28.9% | 2022 Q1 |
| Adar1 Capital Management, LLC | 1.00M | 0.91% | $13.9M | added +12.4% | 2023 Q4 |
| Barclays PLC | 971.9k | 0.88% | $13.5M | added +229.2% | 2022 Q1 |
| Dimensional Fund Advisors | 903.2k | 0.82% | $12.6M | added +17.1% | 2024 Q4 |
| Connor, Clark & Lunn Investment Management LTD. | 868.3k | 0.79% | $12.1M | trimmed -13.5% | 2023 Q3 |
| Woodline Partners LP | 845.8k | 0.77% | $11.8M | unchanged | 2025 Q1 |
| Boxer Capital Management, LLC | 800.0k | 0.72% | $11.1M | unchanged | 2024 Q4 |
| Northern Trust | 779.9k | 0.70% | $10.8M | trimmed -16.8% | 2022 Q1 |
| Charles Schwab Investment Management | 716.2k | 0.65% | $10.0M | unchanged | 2022 Q1 |
| Qube Research & Technologies LTD | 702.2k | 0.64% | $9.8M | added +70.1% | 2023 Q1 |
| Logos Global Management LP | 700.0k | 0.63% | $9.7M | trimmed -26.3% | 2025 Q3 |
| Stempoint Capital LP | 669.7k | 0.61% | $9.3M | added +18.5% | 2025 Q3 |
| Parkman Healthcare Partners LLC | 621.5k | 0.56% | $8.6M | added +62.8% | 2025 Q2 |
| Jupiter Asset Management LTD | 592.7k | 0.54% | $8.2M | added +3705.4% | 2025 Q4 |
| Nantahala Capital Management, LLC | 535.7k | 0.48% | $7.4M | trimmed -35.9% | 2024 Q3 |
| Rock Springs Capital Management LP | 499.8k | 0.45% | $6.9M | unchanged | 2025 Q1 |
| UBS | 481.4k | 0.43% | $6.7M | trimmed -25% | 2022 Q1 |
| Citadel Advisors | 411.5k | 0.37% | $5.7M | added +19.3% | 2022 Q1 |
| Federated Hermes, INC. | 363.5k | 0.33% | $5.1M | trimmed -20.5% | 2022 Q3 |
| HighVista Strategies LLC | 352.1k | 0.32% | $4.9M | added +47.4% | 2025 Q4 |
| Cormorant Asset Management, LP (focused) | 350.0k | 0.32% | $4.9M | trimmed -12.5% | 2025 Q3 |
| Tetragon Partners GP LTD (focused) | 317.9k | 0.29% | $4.4M | added +16.5% | 2025 Q2 |
| iA Global Asset Management INC. | 304.8k | 0.28% | $4.2M | opened | 2026 Q1 |
| Nuveen | 264.9k | 0.24% | $3.7M | trimmed -6.7% | 2025 Q2 |
| BNY Mellon | 251.1k | 0.23% | $3.5M | added +15.5% | 2025 Q2 |
| Wellington Management | 241.6k | 0.22% | $3.4M | added +7% | 2024 Q4 |
Largest 50 of 161 shown; the full ranked, searchable register is at boothcheck.com/holders/AMLX. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.