Zymeworks Inc. (ZYME) Insider Ownership

Historic Ownership Trends

There are no significant Insider Shareholders in Zymeworks as of December 12, 2025.

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
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 80,803 06 Jan, 2025
Paul Andrew Moore Chief Scientific Officer 23,333 06 Jan, 2025
Neil A Klompas President & COO 17,032 14 Mar, 2023
Neil Josephson Chief Medical Officer 14,449 23 Dec, 2022
Jeffrey T L Smith EVP & Chief Medical Officer 8,890 06 Jan, 2025
Christopher Astle SVP & Chief Financial Officer 6,503 08 Jan, 2024

* 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
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 A 5,086,480 $0.00 22,970,388 I X
26 Jun, 2025 Capital, Llc Ecor1 Common Stock D 41 $12.71 22,970,388 I F
15 May, 2025 Capital, Llc Ecor1 Common Stock A 49,502 $11.43 17,877,989 I P
19 May, 2025 Capital, Llc Ecor1 Common Stock A 5,919 $11.78 17,883,908 I P
16 Apr, 2025 Capital, Llc Ecor1 Common Stock A 73,953 $11.16 17,773,727 I P
17 Apr, 2025 Capital, Llc Ecor1 Common Stock A 54,760 $11.52 17,828,487 I P
03 Apr, 2025 Capital, Llc Ecor1 Common Stock A 120,770 $11.84 17,503,336 I P
03 Apr, 2025 Capital, Llc Ecor1 - - 17,503,336 I
04 Apr, 2025 Capital, Llc Ecor1 Common Stock A 196,438 $11.17 17,699,774 I P
04 Apr, 2025 Capital, Llc Ecor1 - - 17,699,774 I
31 Mar, 2025 Capital, Llc Ecor1 Common Stock A 4,397 $11.75 17,259,548 I P
01 Apr, 2025 Capital, Llc Ecor1 Common Stock A 48,658 $11.60 17,308,206 I P
02 Apr, 2025 Capital, Llc Ecor1 Common Stock A 74,360 $11.85 17,382,566 I P
25 Mar, 2025 Capital, Llc Ecor1 Common Stock A 53,501 $12.91 17,211,303 I P
26 Mar, 2025 Capital, Llc Ecor1 Common Stock A 43,848 $12.24 17,255,151 I P
20 Mar, 2025 Capital, Llc Ecor1 Common Stock A 73,476 $12.93 17,104,080 I P
21 Mar, 2025 Capital, Llc Ecor1 Common Stock A 31,033 $12.78 17,135,113 I P
24 Mar, 2025 Capital, Llc Ecor1 Common Stock A 22,689 $13.08 17,157,802 I P
17 Mar, 2025 Capital, Llc Ecor1 Common Stock A 56,277 $12.23 16,858,418 I P