Zymeworks Inc. (ZYME) Insider Ownership

Historic Insider Ownership Trends

ZYME's three largest insider shareholders as of May 14, 2026 are Capital, Llc Ecor1 (Director, 22.97Mn shares), Capital, Llc Ecor1 (TenPercentOwner, 10.09Mn shares), Capital, Llc Ecor1 (TenPercentOwner, 9.89Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Capital, Llc Ecor1 - 0 22,970,388 27 Jun, 2025
Capital, Llc Ecor1 - 0 10,087,473 30 Mar, 2023
Capital, Llc Ecor1 - 0 9,887,473 23 Jan, 2023
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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
09 Apr, 2026 Adam Schayowitz Stock Option (Right to Buy) A 70,000 $0.00 70,000 D A
09 Apr, 2026 Scott Platshon Stock Option (Right to Buy) A 70,000 $0.00 70,000 D A
09 Apr, 2026 Scott Platshon Restricted Stock Unit A 47,000 $0.00 47,000 D A
09 Apr, 2026 Adam Schayowitz Restricted Stock Unit A 47,000 $0.00 47,000 D A
09 Apr, 2026 Scott Platshon Performance Stock Unit A 76,000 $0.00 76,000 D A
09 Apr, 2026 Adam Schayowitz Performance Stock Unit A 76,000 $0.00 76,000 D A
06 Apr, 2026 Kristin Stafford Stock Option (Right to Buy) A 178,000 $0.00 178,000 D A
06 Apr, 2026 Kristin Stafford Stock Option (Right to Buy) A 178,000 $0.00 178,000 D A
06 Apr, 2026 Kristin Stafford Restricted Stock Unit A 119,000 $0.00 119,000 D A
06 Apr, 2026 Kristin Stafford Restricted Stock Unit A 119,000 $0.00 119,000 D A
06 Apr, 2026 Kristin Stafford Restricted Stock Unit A 50,000 $0.00 50,000 D A
06 Apr, 2026 Kristin Stafford Restricted Stock Unit A 50,000 $0.00 50,000 D A
12 Jan, 2026 Mark Hollywood Common Stock A 17,666 $0.00 139,033 D M
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 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