List of insiders holdings for Zymeworks Inc.:
- Shares directly owned by the insider.
- Shares indirectly owned by the insider.
- Total shares owned by the insider (sum of shares directly and indirectly owned).
- Total market value if available.
- Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
What is insider trading>>
- Peter Lynch
What is insider trading>>
| # | Insider Holder Name | Report Date Time | Shares Owned Directly Indirectly | Total Shares Owned | Filing |
| 1 | EcoR1 Capital LLC NODELMAN OLEG Director 10% Owner | 2025-11-19 17:39:39 | 22,970,388 0 | 22,970,388 | Form 13D |
| 2 | Redmile Group LLC Green Jeremy 10% Owner | 2025-11-14 16:15:57 | 3,705,750 0 | 3,705,750 | Form 13G |
| 3 | Galbraith Kenneth Chair & CEO | 2026-01-12 19:07:56 | 936,842 0 | 936,842 | Form 4 |
| 4 | Hollywood Mark EVP & Chief Operating Officer | 2026-01-13 17:11:03 | 351,247 0 | 351,247 | Form 4 |
| 5 | Stafford Kristin EVP, Chief Financial Officer | 2026-04-07 14:24:31 | 347,000 0 | 347,000 | Form 4 |
| 6 | Mekan Sabeen SVP & Chief Medical Officer | 2026-02-02 20:37:00 | 272,000 0 | 272,000 | Form 3 |
| 7 | Moore Paul Andrew Chief Scientific Officer | 2026-01-12 20:32:15 | 266,831 0 | 266,831 | Form 4 |
| 8 | Schayowitz Adam See Remarks | 2026-04-10 16:10:04 | 193,000 0 | 193,000 | Form 4 |
| 9 | Platshon Scott EVP, Chief Business Officer | 2026-04-10 16:10:03 | 193,000 0 | 193,000 | Form 4 |
| 10 | Astle Christopher SVP & Chief Financial Officer | 2024-01-08 18:14:29 | 107,503 0 | 107,503 | Form 4 |
| 11 | Smith Jeffrey T L EVP & Chief Medical Officer | 2026-01-12 21:00:11 | 62,042 0 | 62,042 | Form 4 |
| 12 | Cherry Brian N Director | 2026-01-13 16:30:03 | 38,400 0 | 38,400 | Form 4 |
| 13 | RENTON HOLLINGS Director | 2023-12-08 17:41:20 | 37,000 0 | 37,000 | Form 4 |
| 14 | Hillan Kenneth J. Director | 2023-12-08 17:17:20 | 37,000 0 | 37,000 | Form 4 |
| 15 | Davidson Nancy Director | 2024-12-12 17:52:07 | 31,000 0 | 31,000 | Form 4 |
| 16 | Miller Derek John Michael Director | 2024-12-12 18:20:48 | 31,000 0 | 31,000 | Form 4 |
| 17 | Gallagher Neil Director | 2024-12-12 17:49:50 | 31,000 0 | 31,000 | Form 4 |
| 18 | Cox Troy Director | 2024-12-12 17:52:00 | 31,000 0 | 31,000 | Form 4 |
| 19 | Josephson Neil Chief Medical Officer | 2022-12-23 20:00:19 | 26,221 0 | 26,221 | Form 4/A |
| 20 | Zoth Lota S. Director | 2022-12-23 19:00:22 | 25,000 0 | 25,000 | Form 4 |
| 21 | Sacks Natalie Director | 2022-12-23 19:00:37 | 25,000 0 | 25,000 | Form 4 |
| 22 | Klompas Neil A President & COO | 2023-03-14 17:00:14 | 19,741 700 | 20,441 | Form 4 |
| 23 | Ciongoli Gregory Austin Director | 2026-01-12 20:59:38 | 19,200 0 | 19,200 | Form 4 |
| 24 | Neu Kelvin Director | 2026-01-12 20:56:57 | 19,200 0 | 19,200 | Form 4 |
| 25 | Landry Robert E Director | 2026-01-12 20:56:39 | 19,200 0 | 19,200 | Form 4 |
| 26 | Cesano Alessandra Director | 2026-01-12 20:54:54 | 19,200 0 | 19,200 | Form 4 |
| 27 | Campoy Carlos Director | 2026-01-12 20:50:58 | 19,200 0 | 19,200 | Form 4 |
| 28 | Mahony Susan Director | 2026-01-12 20:42:01 | 19,200 0 | 19,200 | Form 4 |
| 29 | PATTERSON LEONE D EVP, Chief Bus & Fin Officer | 2026-01-07 19:37:56 | 459 0 | 459 | Form 4 |