Significant Ownership of EcoR1 Capital, LLC
- Notable people
- Oleg Nodelman
- Large-stake filing summary
-
- Recent SEC Schedule 13D/G filings for EcoR1 Capital, LLC focus on large-stake beneficial ownership disclosures and amendments.
- Use this view to spot new large holders, amended positions, and activist-style ownership evidence.
- Manager signature
- /s/ Oleg Nodelman - Manager
- Manager location
- San Francisco, CA
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Manager
Names, identifiers, and filing context for this profile.
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Significant Ownership of EcoR1 Capital, LLC
| Sym | Company | Class | Ownership | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|---|
| ZYME | Zymeworks Inc. | Common Stock | 31% | $420,817,508 | 22,970,388 | 0% | EcoR1 Capital, LLC | 16 Nov 2025 | |
| ITOS | iTeos Therapeutics, Inc. | Common Stock | 28% | $78,563,988 | +$36,448,488 | 10,688,978 | +87% | EcoR1 Capital, LLC | 15 May 2025 |
| ATRA | Atara Biotherapeutics, Inc. | Common Stock | 17% | 1,552,000 | EcoR1 Capital, LLC | 07 May 2026 | |||
| GLPG | Galapagos NV | Ordinary Shares, no par value | 13% | $243,919,471 | +$25,507,847 | 8,714,522 | +12% | EcoR1 Capital, LLC | 24 Jul 2025 |
| NGNE | Neurogene Inc. | Common Stock | 9.9% | $25,005,492 | 1,442,902 | EcoR1 Capital, LLC | 30 Sep 2025 | ||
| ATRA | Atara Biotherapeutics, Inc. | Common Stock | 9.9% | $10,258,030 | 715,853 | EcoR1 Capital, LLC | 30 Sep 2025 | ||
| IBIO | iBio, Inc. | Common Stock | 9.9% | $2,673,600 | 2,228,000 | EcoR1 Capital, LLC | 10 Dec 2025 | ||
| Eloxx Pharmaceuticals, Inc. | Comon Stock | 9.9% | 403,586 | EcoR1 Capital, LLC | 09 Jun 2026 | ||||
| Aktis Oncology, Inc. | Common Stock | 9.1% | 4,862,335 | Oleg Nodelman | 12 Jan 2026 | ||||
| FULC | Fulcrum Therapeutics, Inc. | Common Stock | 9% | $41,760,000 | 6,000,000 | EcoR1 Capital, LLC | 17 Jun 2026 | ||
| MREO | Mereo BioPharma Group plc | Ordinary Shares | 8.4% | $22,058,611 | -$2,526,389 | 66,844,275 | -10% | EcoR1 Capital, LLC | 31 Mar 2026 |
| ALVR | Allovir, Inc. | Common Stock | 8.1% | $3,886,623 | 408,688 | EcoR1 Capital, LLC | 31 Dec 2024 | ||
| ETON | Eton Pharmaceuticals, Inc. | Common Stock | 7.7% | $28,407,583 | 1,981,003 | EcoR1 Capital, LLC | 31 Dec 2024 | ||
| ORIC | ORIC Pharmaceuticals, Inc. | Common Stock | 6.9% | $73,336,464 | 6,728,116 | EcoR1 Capital, LLC | 29 Jul 2025 | ||
| KURA | Kura Oncology, Inc. | Common Stock | 4.8% | $23,520,000 | 4,200,000 | EcoR1 Capital, LLC | 30 Jun 2025 | ||
| IMNM | Immunome Inc. | Common Stock | 4.7% | $34,756,616 | 4,079,415 | EcoR1 Capital, LLC | 31 Mar 2025 | ||
| IBIO | iBio, Inc. | Common Stock | 4.6% | 1,583,000 | EcoR1 Capital, LLC | 31 Mar 2026 | |||
| ADAP | Adaptimmune Therapeutics PLC | Ordinary Shares | 4.2% | $6,600,000 | 66,000,000 | EcoR1 Capital, LLC | 15 Aug 2025 | ||
| AVIR | Atea Pharmaceuticals, Inc. | Common Stock | 4% | $9,857,876 | 3,341,653 | EcoR1 Capital, LLC | 31 Dec 2024 | ||
| HOOK | HOOKIPA Pharma Inc. | Common Stock | 4% | $326,643 | 388,861 | EcoR1 Capital, LLC | 31 Dec 2024 | ||
| ALGS | Aligos Therapeutics, Inc. | Common Stock | 3.9% | $1,116,360 | 210,634 | EcoR1 Capital, LLC | 31 Mar 2025 | ||
| XNCR | Xencor Inc | Common Stock | 2.9% | $26,348,810 | -$29,655,990 | 2,183,000 | -53% | EcoR1 Capital, LLC | 31 Mar 2026 |
| APLS | Apellis Pharmaceuticals, Inc. | Common Stock | 2.7% | $78,009,140 | 3,447,156 | EcoR1 Capital, LLC | 30 Sep 2025 | ||
| WHWK | Aadi Bioscience, Inc. | Common Stock | 1.4% | $531,690 | 345,253 | EcoR1 Capital, LLC | 31 Dec 2024 | ||
| TCRX | TScan Therapeutics, Inc. | Voting Common Stock | 1.3% | $1,060,533 | 662,833 | EcoR1 Capital, LLC | 31 Mar 2025 | ||
| KLRS | Kalaris Therapeutics, Inc. | Common Stock | 1.1% | $1,315,201 | 201,718 | EcoR1 Capital, LLC | 31 Mar 2025 | ||
| ARVN | ARVINAS, INC. | Common Stock | 0% | $0 | 0 | EcoR1 Capital, LLC | 31 Mar 2025 | ||
| PRTA | PROTHENA CORP PUBLIC LTD CO | Ordinary Shares | 0% | $0 | -$40,261,884 | 0 | -100% | EcoR1 Capital, LLC | 27 May 2025 |
| HLVX | HilleVax, Inc. | Common Stock | 0% | $0 | -$6,044,280 | 0 | -100% | EcoR1 Capital, LLC | 30 Sep 2025 |
| MRSN | Mersana Therapeutics, Inc. | Common Stock | 0% | $0 | -$4,168,241 | 0 | -100% | EcoR1 Capital, LLC | 31 Mar 2025 |
| VYGR | Voyager Therapeutics, Inc. | Common Stock | 0% | $0 | -$15,450,989 | 0 | -100% | EcoR1 Capital, LLC | 31 Mar 2026 |
| QURE | uniQure N.V. | Ordinary Shares, par value(euro)0.05 per share | 0% | $0 | -$84,954,515 | 0 | -100% | EcoR1 Capital, LLC | 31 Dec 2025 |
| TNGX | Tango Therapeutics, Inc. | Common Stock | 0% | $0 | -$124,911,148 | 0 | -100% | EcoR1 Capital, LLC | 31 Dec 2025 |
| THRD | Third Harmonic Bio, Inc. | Common Stock | 0% | $0 | 0 | EcoR1 Capital, LLC | 31 Mar 2025 | ||
| TECX | Tectonic Therapeutic, Inc. | Common Stock | 0% | $0 | -$14,672,048 | 0 | -100% | EcoR1 Capital, LLC | 30 Sep 2025 |
Schedules 13D/G Reported by EcoR1 Capital, LLC:
| Sym | Target | Class | Ownership | Change | Current shares | Change | Value | Reporting name | Form | Report period | Filing date |
|---|
Schedule rows are parsed from SEC 13D/G filings. Open the linked filing or target page to verify the reported ownership and shares.