Quick Takeaways
- EcoR1 Capital, LLC filed SCHEDULE 13D/A for Zymeworks Inc. Common Stock (ZYME).
- Disclosed ownership: 31%.
- Date of event: 16 Nov 2025.
EcoR1 Capital, LLC - 16 Nov 2025 SCHEDULE 13D/A Report for Zymeworks Inc. Common Stock (ZYME)
- Filing Manager
- EcoR1 Capital, LLC
- Reporting Manager
- EcoR1 Capital, LLC
- Security
- Zymeworks Inc. Common Stock
- Symbol
- ZYME
- Shares outstanding
- 74,822,111 shares
- Disclosed Ownership
- 22,970,388 shares
- Ownership
- 31%
- Form type
- SCHEDULE 13D/A
- Filing time
- 19 Nov 2025, 17:39:39 UTC
- Date of event
- 16 Nov 2025
- Previous filing
- 27 Jun 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"EcoR1 Capital, LLC disclosed 31% ownership in Zymeworks Inc. Common Stock (ZYME) on 16 Nov 2025."
What Changed
- Previous schedule filing date: 27 Jun 2025.
- Current filing was accepted on 19 Nov 2025, 17:39.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (3)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| EcoR1 Capital, LLC | 31% | 22,970,388 | 0 | 22,970,388 | /s/ Oleg Nodelman | Manager | 0001587114 |
| Oleg Nodelman | 31% | 22,970,388 | 0 | 22,970,388 | /s/ Oleg Nodelman | Reporting person | 0001454385 |
| EcoR1 Capital Fund Qualified, L.P. | 29% | 21,582,563 | 0 | 21,582,563 | /s/ Oleg Nodelman | Manager of the General Partner, EcoR1 Capital, LLC | 0001598292 |