Over the 90-day window ending February 10, 2026, Zymeworks's three dominant insider ownership positions are held by Director Capital, Llc Ecor1 (22.97Mn shares), TenPercentOwner Group, Llc Redmile (6.08Mn shares), Director Gregory Austin Ciongoli (488.50K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Capital, Llc Ecor1 | 22,970,388 | 27 Jun, 2025 | |
| Group, Llc Redmile | 6,075,918 | 18 Oct, 2022 | |
| Gregory Austin Ciongoli | 488,500 | 12 Aug, 2025 | |
| Kenneth Galbraith | Chair & Ceo | 226,842 | 12 Jan, 2026 |
| Mark Hollywood | Evp & Chief Operating Officer | 132,913 | 13 Jan, 2026 |
| Paul Andrew Moore | Chief Scientific Officer | 48,497 | 12 Jan, 2026 |
| Jeffrey T L Smith | Evp & Chief Medical Officer | 26,708 | 12 Jan, 2026 |
| Neil A Klompas | President & Coo | 17,032 | 14 Mar, 2023 |
| Neil Josephson | Chief Medical Officer | 14,449 | 23 Dec, 2022 |
| Christopher Astle | Svp & Chief Financial Officer | 6,503 | 08 Jan, 2024 |
| Leone D Patterson | Evp And Chief Bus & Fin Officer | 459 | 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 | Kenneth Galbraith | Common Stock | D | 30,424 | $22.67 | 226,842 | D | S |
| 12 Jan, 2026 | Kenneth Galbraith | Common Stock | A | 64,000 | $0.00 | 257,266 | D | M |
| 12 Jan, 2026 | Jeffrey T L Smith | Common Stock | D | 9,310 | $22.67 | 26,708 | D | S |
| 12 Jan, 2026 | Jeffrey T L Smith | Common Stock | A | 17,666 | $0.00 | 36,018 | D | M |
| 12 Jan, 2026 | Paul Andrew Moore | Common Stock | D | 9,560 | $22.67 | 48,497 | D | S |
| 12 Jan, 2026 | Paul Andrew Moore | Common Stock | A | 17,666 | $0.00 | 58,057 | D | M |
| 12 Jan, 2026 | Mark Hollywood | Common Stock | D | 6,120 | $22.67 | 132,913 | D | S |
| 12 Jan, 2026 | Mark Hollywood | Common Stock | A | 17,666 | $0.00 | 139,033 | D | M |
| 06 Jan, 2026 | Leone D Patterson | Common Stock | A | 459 | $10.55 | 459 | D | A |
| 05 Jan, 2026 | Kenneth Galbraith | Common Stock | D | 22,657 | $25.10 | 158,286 | D | S |
| 05 Jan, 2026 | Kenneth Galbraith | Common Stock | D | 31,686 | $25.10 | 193,266 | D | S |
| 05 Jan, 2026 | Kenneth Galbraith | Common Stock | A | 66,666 | $0.00 | 224,952 | D | M |
| 05 Jan, 2026 | Kenneth Galbraith | Common Stock | A | 47,668 | $0.00 | 180,943 | D | M |
| 05 Jan, 2026 | Jeffrey T L Smith | Common Stock | A | 20,000 | $0.00 | 28,890 | D | M |
| 05 Jan, 2026 | Jeffrey T L Smith | Common Stock | D | 10,538 | $25.10 | 18,352 | D | S |
| 05 Jan, 2026 | Paul Andrew Moore | Common Stock | D | 10,821 | $25.10 | 40,391 | D | S |
| 05 Jan, 2026 | Paul Andrew Moore | Common Stock | A | 17,168 | $0.00 | 40,501 | D | M |
| 05 Jan, 2026 | Paul Andrew Moore | Common Stock | A | 20,000 | $0.00 | 51,212 | D | M |
| 05 Jan, 2026 | Paul Andrew Moore | Common Stock | D | 9,289 | $25.10 | 31,212 | D | S |
| 22 Dec, 2025 | Kenneth Galbraith | Common Stock | A | 100,000 | $0.00 | 180,803 | D | M |