Zymeworks Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| Galbraith Kenneth | Chair & CEO | Option Exercise | 100,000 | — | — | 180,803 | Dec 22, 2025 |
| Ciongoli Gregory Austin | — | Award / Grant | 415,000 | $12.02 | $4,988,300 | 488,500 | Aug 12, 2025 |
| NODELMAN OLEG | — | Tax Withholding | 41 | $12.71 | $521 | 22,970,388 | Jun 26, 2025 |
| EcoR1 Capital, LLC | — | Purchase | 49,502 | $11.43 | $565,808 | 17,877,989 | May 19, 2025 |
| EcoR1 Capital, LLC | — | Purchase | 54,760 | $11.52 | $630,835 | 17,828,487 | Apr 16, 2025 |
| NODELMAN OLEG | — | Purchase | 196,438 | $11.17 | $2,194,212 | 17,699,774 | Apr 3, 2025 |
| EcoR1 Capital, LLC | — | Purchase | 4,397 | $11.75 | $51,665 | 17,259,548 | Apr 1, 2025 |
| EcoR1 Capital, LLC | — | Purchase | 53,501 | $12.91 | $690,698 | 17,211,303 | Mar 26, 2025 |
| EcoR1 Capital, LLC | — | Purchase | 22,689 | $13.08 | $296,772 | 17,157,802 | Mar 20, 2025 |
| EcoR1 Capital, LLC | — | Purchase | 56,277 | $12.23 | $688,268 | 16,858,418 | Mar 19, 2025 |
| NODELMAN OLEG | — | Purchase | 320,690 | $11.49 | $3,684,728 | 16,040,851 | Mar 13, 2025 |
| EcoR1 Capital, LLC | — | Purchase | 19,748 | $13.87 | $273,905 | 15,720,161 | Jan 16, 2025 |
| EcoR1 Capital, LLC | — | Purchase | 74,125 | $13.39 | $992,534 | 15,485,203 | Jan 15, 2025 |
| EcoR1 Capital, LLC | — | Purchase | 21,021 | $14.07 | $295,765 | 15,206,980 | Jan 10, 2025 |
| Moore Paul Andrew | Chief Scientific Officer | Option Exercise | 17,166 | — | — | 24,533 | Jan 6, 2025 |
| Galbraith Kenneth | Chair & CEO | Option Exercise | 47,666 | — | — | 71,428 | Jan 6, 2025 |
| Smith Jeffrey T L | EVP & Chief Medical Officer | Sale | 11,110 | $14.92 | $165,761 | 8,890 | Jan 6, 2025 |
| EcoR1 Capital, LLC | — | Purchase | 146,501 | $14.57 | $2,134,520 | 15,028,079 | Dec 30, 2024 |
| EcoR1 Capital, LLC | — | Purchase | 11,958 | $14.12 | $168,847 | 14,704,239 | Dec 27, 2024 |
| EcoR1 Capital, LLC | — | Purchase | 298,818 | $13.53 | $4,043,008 | 13,736,291 | Dec 23, 2024 |
| Moore Paul Andrew | Chief Scientific Officer | Sale | 7,460 | $10.65 | $79,449 | 9,706 | Jan 8, 2024 |
| Astle Christopher | SVP & Chief Financial Officer | Sale | 4,563 | $10.65 | $48,596 | 7,934 | Jan 5, 2024 |
| Galbraith Kenneth | Chair & CEO | Sale | 18,198 | $10.65 | $193,809 | 29,468 | Jan 5, 2024 |
| Astle Christopher | SVP & Chief Financial Officer | Option Exercise | 1,550 | — | — | 2,883 | Dec 11, 2023 |
| EcoR1 Capital, LLC | — | Purchase | 3,350,000 | $8.12 | $27,202,000 | 13,437,473 | Jun 16, 2023 |
| EcoR1 Capital, LLC | — | Purchase | 200,000 | $8.00 | $1,600,000 | 10,087,473 | Mar 28, 2023 |
| Klompas Neil A | President & COO | Sale | 2,977 | $7.83 | $23,310 | 17,032 | Mar 10, 2023 |
| EcoR1 Capital, LLC | — | Purchase | 144,100 | $9.49 | $1,367,509 | 9,724,073 | Jan 20, 2023 |
| EcoR1 Capital, LLC | — | Purchase | 203,000 | $10.00 | $2,030,000 | 9,579,973 | Jan 17, 2023 |
| EcoR1 Capital, LLC | — | Purchase | 920,000 | $7.65 | $7,038,000 | 8,488,573 | Jan 11, 2023 |
| Astle Christopher | SVP & Chief Financial Officer | Option Exercise | 1,550 | — | — | 2,220 | Dec 12, 2022 |
| Astle Christopher | SVP & Chief Financial Officer | Option Exercise | 1,550 | — | — | 2,220 | Dec 12, 2022 |
| Josephson Neil | Chief Medical Officer | Sale | 2,475 | $8.10 | $20,048 | 14,449 | Nov 10, 2022 |
| Josephson Neil | Chief Medical Officer | Sale | 2,475 | $8.10 | $20,048 | 14,449 | Nov 10, 2022 |
| Redmile Group, LLC | — | Award / Grant | 30,481 | $5.03 | $153,319 | 6,075,918 | Oct 13, 2022 |
| Redmile Group, LLC | — | Purchase | 30,481 | $5.03 | $153,319 | 6,075,918 | Oct 13, 2022 |