EcoR1 Capital, LLC 13D and 13G filings for Zymeworks Inc.:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2025-11-19 5:39 pm Unchanged | 2025-11-16 | 13D | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 22,970,388 30.700% | 0 (Unchanged) | Filing |
| 2025-06-27 6:14 pm Purchase | 2025-06-26 | 13D | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 22,970,388 30.700% | 5,270,614 (+29.78%) | Filing |
| 2025-04-08 4:24 pm Purchase | 2025-04-04 | 13D | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 17,699,774 25.400% | 841,356 (+4.99%) | Filing |
| 2025-03-17 7:50 pm Purchase | 2025-03-13 | 13D | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 16,858,418 24.200% | 1,138,257 (+7.24%) | Filing |
| 2025-02-18 6:25 pm Purchase | 2025-02-17 | 13D | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 15,720,161 22.800% | 309,083 (+2.01%) | Filing |
| 2025-01-13 7:18 pm Purchase | 2025-01-10 | 13D | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 15,411,078 22.400% | 718,797 (+4.89%) | Filing |
| 2024-12-23 7:54 pm Purchase | 2024-12-19 | 13D | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 14,692,281 21.300% | 559,990 (+3.96%) | Filing |
| 2024-02-22 7:01 pm Unchanged | 2024-02-22 | 13D | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 14,132,291 19.990% | 0 (Unchanged) | Filing |
| 2024-02-14 6:59 pm Purchase | 2023-12-31 | 13G | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 14,132,291 19.990% | 694,818 (+5.17%) | Filing |
| 2023-06-21 4:05 pm Purchase | 2023-06-16 | 13G | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 13,437,473 19.900% | 5,868,900 (+77.54%) | Filing |
| 2022-11-01 4:01 pm Purchase | 2022-10-31 | 13G | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 7,568,573 12.000% | 1,600,000 (+26.81%) | Filing |
| 2022-10-28 5:33 pm Purchase | 2022-10-26 | 13G | ZYMEWORKS INC ZYME | EcoR1 Capital, LLC | 5,968,573 9.900% | 5,968,573 (New Position) | Filing |