As of March 23, 2026, Zymeworks's top three insider holders are Capital, Llc Ecor1 (Director, 22.97Mn shares), Group, Llc Redmile (TenPercentOwner, 6.08Mn shares), Gregory Austin Ciongoli (Director, 488.50K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Capital, Llc Ecor1 | 0 | 22,970,388 | 27 Jun, 2025 | |
| Group, Llc Redmile | 0 | 6,075,918 | 18 Oct, 2022 | |
| Gregory Austin Ciongoli | 488,500 | 0 | 12 Aug, 2025 | |
| Kenneth Galbraith | Chair Ceo | 226,842 | 0 | 12 Jan, 2026 |
| Mark Hollywood | Evp Chief Operating Officer | 132,913 | 0 | 13 Jan, 2026 |
| Paul Andrew Moore | Chief Scientific Officer | 48,497 | 0 | 12 Jan, 2026 |
| Jeffrey T L Smith | Evp Chief Medical Officer | 26,708 | 0 | 12 Jan, 2026 |
| Neil A Klompas | President Coo | 17,032 | 0 | 14 Mar, 2023 |
| Neil Josephson | Chief Medical Officer | 14,449 | 0 | 23 Dec, 2022 |
| Christopher Astle | Svp Chief Financial Officer | 6,503 | 0 | 08 Jan, 2024 |
| Leone D Patterson | Evp, Chief Bus Fin Officer | 459 | 0 | 07 Jan, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 12 Jan, 2026 | Brian N Cherry | Stock Option (Right to Buy) | A | 23,000 | $0.00 | 23,000 | D | A |
| 12 Jan, 2026 | Mark Hollywood | Common Stock | A | 17,666 | $0.00 | 139,033 | D | M |
| 12 Jan, 2026 | Mark Hollywood | Common Stock | D | 6,120 | $22.67 | 132,913 | D | S |
| 12 Jan, 2026 | Brian N Cherry | Restricted Stock Unit | A | 15,400 | $0.00 | 15,400 | D | A |
| 12 Jan, 2026 | Mark Hollywood | Restricted Stock Unit | D | 17,666 | $0.00 | 35,334 | D | M |
| 12 Jan, 2026 | Mark Hollywood | Stock Option (Right to Buy) | A | 70,000 | $0.00 | 70,000 | D | A |
| 12 Jan, 2026 | Mark Hollywood | Restricted Stock Unit | A | 47,000 | $0.00 | 47,000 | D | A |
| 12 Jan, 2026 | Mark Hollywood | Performance Stock Unit | A | 66,000 | $0.00 | 66,000 | D | A |
| 12 Jan, 2026 | Carlos Campoy | Stock Option (Right to Buy) | A | 11,500 | $0.00 | 11,500 | D | A |
| 12 Jan, 2026 | Kelvin Neu | Stock Option (Right to Buy) | A | 11,500 | $0.00 | 11,500 | D | A |
| 12 Jan, 2026 | Jeffrey T L Smith | Common Stock | A | 17,666 | $0.00 | 36,018 | D | M |
| 12 Jan, 2026 | Kenneth Galbraith | Common Stock | A | 64,000 | $0.00 | 257,266 | D | M |
| 12 Jan, 2026 | Susan Mahony | Stock Option (Right to Buy) | A | 11,500 | $0.00 | 11,500 | D | A |
| 12 Jan, 2026 | Robert E Landry | Stock Option (Right to Buy) | A | 11,500 | $0.00 | 11,500 | D | A |
| 12 Jan, 2026 | Alessandra Cesano | Stock Option (Right to Buy) | A | 11,500 | $0.00 | 11,500 | D | A |
| 12 Jan, 2026 | Gregory Austin Ciongoli | Stock Option (Right to Buy) | A | 11,500 | $0.00 | 11,500 | D | A |
| 12 Jan, 2026 | Paul Andrew Moore | Common Stock | A | 17,666 | $0.00 | 58,057 | D | M |
| 12 Jan, 2026 | Paul Andrew Moore | Common Stock | D | 9,560 | $22.67 | 48,497 | D | S |
| 12 Jan, 2026 | Carlos Campoy | Restricted Stock Unit | A | 7,700 | $0.00 | 7,700 | D | A |
| 12 Jan, 2026 | Kenneth Galbraith | Common Stock | D | 30,424 | $22.67 | 226,842 | D | S |