Data spanning the past 90 days through January 10, 2026 reveals that Zymeworks's three principal insider shareholders consist of 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 | 193,266 | 05 Jan, 2026 |
| Paul Andrew Moore | Chief Scientific Officer | 40,391 | 05 Jan, 2026 |
| Jeffrey T L Smith | Evp & Chief Medical Officer | 18,352 | 05 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 |
|---|---|---|---|---|---|---|---|---|
| 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 | D | 10,538 | $25.10 | 18,352 | D | S |
| 05 Jan, 2026 | Jeffrey T L Smith | Common Stock | A | 20,000 | $0.00 | 28,890 | 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 |
| 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 |
| 22 Dec, 2025 | Kenneth Galbraith | Common Stock | D | 47,528 | $27.02 | 133,275 | D | S |
| 22 Dec, 2025 | Kenneth Galbraith | Common Stock | A | 100,000 | $0.00 | 180,803 | D | M |
| 12 Aug, 2025 | Gregory Austin Ciongoli | - | - | 488,500 | D | |||
| 12 Aug, 2025 | Gregory Austin Ciongoli | Common Stock | A | 415,000 | $12.02 | 488,500 | D | A |
| 26 Jun, 2025 | Capital, Llc Ecor1 | Common Stock | D | 41 | $12.71 | 22,970,388 | I | F |
| 26 Jun, 2025 | Capital, Llc Ecor1 | - | - | 22,970,388 | I | |||
| 26 Jun, 2025 | Capital, Llc Ecor1 | Common Stock | A | 5,086,480 | $0.00 | 22,970,388 | I | X |
| 19 May, 2025 | Capital, Llc Ecor1 | - | - | 17,883,908 | I | |||
| 19 May, 2025 | Capital, Llc Ecor1 | Common Stock | A | 5,919 | $11.78 | 17,883,908 | I | P |