🕵️ Zymeworks Inc. ($ZYME)

SEC insider & ownership activity, last 12 months · CIK 1937653 · every row links its SEC filing

Over the last 12 months insiders sold $4.7M with no open-market buying against it. Kenneth Galbraith sold $3.3M (Dec–Jan). No red-flag 8-Ks in the window.

Aug 2025: net +$0 Sep 2025: net +$0 Oct 2025: net +$0 Nov 2025: net +$0 Dec 2025: net -$1.3M Jan 2026: net -$3.4M Mar 2026: net +$0 Mar 2026: net +$0 Apr 2026: net +$0 May 2026: net +$0 Jun 2026: net +$0 Jul 2026: net +$0
Monthly net open-market insider flow, last 12 months (up = net buying)

Insider flow

0 buyers, $0 (0 lots) · 4 sellers, $4.7M (10 lots)

InsiderBuysBoughtSellsSoldLast
Kenneth Galbraith0– 4$3.3MJan 12, 2026
Paul Andrew Moore0– 3$721KJan 12, 2026
Jeffrey T L Smith0– 2$476KJan 12, 2026
Mark Hollywood0– 1$139KJan 12, 2026

5%+ holders

HolderStakeClassScheduleEvent
ECOR1 Capital, LLC 30.7% 13DNov 16, 2025 filing ↗
Oleg Nodelman 30.7% 13DNov 16, 2025 filing ↗
ECOR1 Capital Fund Qualified, L.P. 28.8% 13DNov 16, 2025 filing ↗
ECOR1 Capital, LLC 21.3% 13DDec 19, 2024 filing ↗
Oleg Nodelman 21.3% 13DDec 19, 2024 filing ↗
ECOR1 Capital Fund Qualified, L.P. 20.1% 13DDec 19, 2024 filing ↗
Rubric Capital Management LP 9.5% 13GMay 15, 2026 filing ↗
David Rosen 9.5% 13GMay 15, 2026 filing ↗
Perceptive Advisors LLC 5.4% 13GApr 15, 2026 filing ↗
Joseph Edelman 5.4% 13GApr 15, 2026 filing ↗
Perceptive Life Sciences Master Fund, Ltd. 5.4% 13GApr 15, 2026 filing ↗
BVF Partners L P/IL 5.2% 13GNov 14, 2025 filing ↗
BVF INC/IL 5.2% 13GNov 14, 2025 filing ↗
Mark N. Lampert 5.2% 13GNov 14, 2025 filing ↗

Planned insider sales (Form 144)

SellerPlannedApprox. sale date
Jeffrey T L Smith$6.1MMar 6, 2026 filing ↗
Leone D Patterson$715KFeb 17, 2026 filing ↗
Leone D Patterson$3.0MFeb 13, 2026 filing ↗
Leone D Patterson$158KJan 12, 2026 filing ↗
Jeffrey T L Smith$216KJan 12, 2026 filing ↗
Paul Andrew Moore$222KJan 12, 2026 filing ↗
Mark Hollywood$142KJan 12, 2026 filing ↗
Kenneth Galbraith$705KJan 12, 2026 filing ↗
Smith Jeffrey T L$281KJan 5, 2026 filing ↗
Kenneth Galbraith$1.4MJan 5, 2026 filing ↗
Paul Andrew Moore$535KJan 5, 2026 filing ↗
Galbraith, Kenneth$1.3MDec 22, 2025 filing ↗
Derek John Michael Miller$2.8MNov 24, 2025 filing ↗
Neil Gallagher$2.5MNov 21, 2025 filing ↗

Material events (8-K)

ItemEvent date
Material agreement (1.01)Jun 28, 2026 filing ↗
Reg FD disclosure (7.01)Jun 28, 2026 filing ↗
Financial Statements and Exhibits (9.01)Jun 28, 2026 filing ↗
Reg FD disclosure (7.01)May 14, 2026 filing ↗
Other events (8.01)May 14, 2026 filing ↗
Financial Statements and Exhibits (9.01)May 14, 2026 filing ↗
Earnings (2.02)May 7, 2026 filing ↗
Reg FD disclosure (7.01)May 7, 2026 filing ↗
Financial Statements and Exhibits (9.01)May 7, 2026 filing ↗
Officer/director changes (5.02)Mar 31, 2026 filing ↗
Financial Statements and Exhibits (9.01)Mar 31, 2026 filing ↗
Earnings (2.02)Mar 2, 2026 filing ↗
Reg FD disclosure (7.01)Mar 2, 2026 filing ↗
Financial Statements and Exhibits (9.01)Mar 2, 2026 filing ↗
Material agreement (1.01)Mar 2, 2026 filing ↗
New financial obligation (2.03)Mar 2, 2026 filing ↗
Reg FD disclosure (7.01)Mar 2, 2026 filing ↗
Financial Statements and Exhibits (9.01)Mar 2, 2026 filing ↗
Earnings (2.02)Jan 6, 2026 filing ↗
Officer/director changes (5.02)Jan 6, 2026 filing ↗
Other events (8.01)Jan 6, 2026 filing ↗
Financial Statements and Exhibits (9.01)Jan 6, 2026 filing ↗
Shareholder vote (5.07)Dec 30, 2025 filing ↗
Other events (8.01)Nov 17, 2025 filing ↗
Financial Statements and Exhibits (9.01)Nov 17, 2025 filing ↗
Officer/director changes (5.02)Nov 16, 2025 filing ↗
Reg FD disclosure (7.01)Nov 16, 2025 filing ↗
Other events (8.01)Nov 16, 2025 filing ↗
Financial Statements and Exhibits (9.01)Nov 16, 2025 filing ↗
Earnings (2.02)Nov 6, 2025 filing ↗