Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
186 institutional managers reported holding ALMS for the quarter ended Mar 31, 2026. Together they hold about 79% of shares outstanding; the top 10 hold 41%. 81 opened new positions; 28 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 7.17M | 5.73% | $158.0M | added +57% | 2024 Q3 |
| Deep Track Capital, LP | 6.77M | 5.42% | $149.2M | opened | 2026 Q1 |
| Samsara Biocapital, LLC (focused) | 6.35M | 5.07% | $139.8M | added +10.2% | 2024 Q3 |
| Foresite Capital Management V, LLC (focused) | 5.90M | 4.72% | $129.9M | added +2% | 2024 Q2 |
| Vanguard Group | 5.38M | 4.30% | $118.6M | added +31.2% | 2024 Q2 |
| venBio Partners LLC (focused) | 4.53M | 3.62% | $99.8M | trimmed -2% | 2024 Q2 |
| Foresite Capital Management VI LLC (focused) | 4.25M | 3.40% | $93.6M | unchanged | 2024 Q4 |
| Cormorant Asset Management, LP (focused) | 3.95M | 3.16% | $87.0M | added +8.6% | 2024 Q2 |
| Nextech Invest, LTD. (focused) | 3.54M | 2.83% | $78.0M | added +21.4% | 2024 Q3 |
| T. Rowe Price | 3.29M | 2.63% | $72.4M | added +6418.5% | 2025 Q2 |
| Saturn V Capital Management LP (focused) | 3.20M | 2.56% | $70.5M | added +2.1% | 2025 Q4 |
| UBS | 3.14M | 2.51% | $69.1M | added +2651.8% | 2024 Q3 |
| Octagon Capital Advisors LP (focused) | 2.83M | 2.26% | $62.4M | added +11.9% | 2025 Q4 |
| MPM Bioimpact LLC (focused) | 2.39M | 1.91% | $52.6M | trimmed -0.6% | 2025 Q4 |
| Janus Henderson | 2.10M | 1.68% | $46.2M | opened | 2026 Q1 |
| Baker Bros. Advisors LP | 2.01M | 1.61% | $44.3M | added +28.8% | 2024 Q2 |
| SR One Capital Management, LP (focused) | 1.96M | 1.57% | $43.2M | unchanged | 2024 Q2 |
| Geode Capital | 1.92M | 1.53% | $42.3M | added +29% | 2024 Q3 |
| State Street | 1.80M | 1.44% | $39.7M | added +43.1% | 2024 Q3 |
| Invesco | 1.51M | 1.21% | $33.3M | added +258.3% | 2025 Q1 |
| Ikarian Capital, LLC | 1.21M | 0.97% | $26.7M | opened | 2026 Q1 |
| Marshall Wace | 1.17M | 0.94% | $25.8M | added +214.5% | 2025 Q4 |
| Weiss Asset Management LP | 1.10M | 0.88% | $24.2M | opened | 2026 Q1 |
| Principal Financial Group INC | 1.06M | 0.85% | $23.3M | opened | 2025 Q3 |
| FMR (Fidelity) | 973.8k | 0.78% | $21.5M | added +3959.6% | 2024 Q3 |
| Great Point Partners LLC (focused) | 856.1k | 0.69% | $18.9M | opened | 2026 Q1 |
| Integral Health Asset Management, LLC | 800.0k | 0.64% | $17.6M | opened | 2026 Q1 |
| Yu Fan (focused) | 776.8k | 0.62% | $17.1M | trimmed -1.6% | 2024 Q2 |
| Voloridge Investment Management | 749.1k | 0.60% | $16.5M | opened | 2026 Q1 |
| Goldman Sachs | 718.0k | 0.57% | $15.8M | added +68.1% | 2024 Q3 |
| Two Sigma | 658.1k | 0.53% | $14.5M | added +120.7% | 2025 Q1 |
| Charles Schwab Investment Management | 635.4k | 0.51% | $14.0M | added +26.1% | 2024 Q3 |
| Millennium Management | 606.3k | 0.48% | $13.4M | trimmed -47.3% | 2025 Q2 |
| D. E. Shaw | 572.1k | 0.46% | $12.6M | added +146.9% | 2025 Q4 |
| Northern Trust | 563.5k | 0.45% | $12.4M | added +34.7% | 2024 Q3 |
| Opaleye Management INC. | 550.0k | 0.44% | $12.1M | added +2.8% | 2025 Q2 |
| Orbimed Advisors LLC | 548.2k | 0.44% | $12.1M | trimmed -50.3% | 2025 Q2 |
| Prudential Financial INC | 538.7k | 0.43% | $11.9M | opened | 2026 Q1 |
| Royce & Associates | 476.4k | 0.38% | $10.5M | opened | 2026 Q1 |
| Spruce Street Capital LP (focused) | 392.6k | 0.31% | $8.6M | opened | 2026 Q1 |
| Point72 | 363.0k | 0.29% | $8.0M | opened | 2026 Q1 |
| Citadel Advisors | 351.5k | 0.28% | $7.7M | added +194.6% | 2024 Q2 |
| Boothbay Fund Management, LLC | 346.1k | 0.28% | $7.6M | opened | 2026 Q1 |
| Artia Global Partners LP (focused) | 325.0k | 0.26% | $7.2M | opened | 2026 Q1 |
| Nuveen | 319.2k | 0.26% | $7.0M | added +88.3% | 2024 Q3 |
| Exome Asset Management LLC (focused) | 279.2k | 0.22% | $6.2M | trimmed -4.5% | 2025 Q3 |
| ExodusPoint | 266.2k | 0.21% | $5.9M | added +2277.8% | 2025 Q2 |
| Omega Fund Management, LLC (focused) | 241.3k | 0.19% | $5.3M | trimmed -63.1% | 2024 Q2 |
| Wellington Management | 239.2k | 0.19% | $5.3M | added +41.5% | 2025 Q3 |
| Stempoint Capital LP | 229.6k | 0.18% | $5.1M | opened | 2026 Q1 |
Largest 50 of 186 shown; the full ranked, searchable register is at boothcheck.com/holders/ALMS. 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.