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ISSUER PROFILE · CIK 0001937653 · CUSIP 98985Y108

Zymeworks Inc.ZYME

3 13D/G filings 1 distinct filers 71 insider transactions (365d)

Post-Filing Returns · across 3 activist filings on this issuer

Median 30d
avg —
Median 60d
avg —
Median 90d
avg —
Median 180d
avg —

Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.

Cross-Reference Snapshot

Activist filings
3
3 SCHEDULE
Distinct filers
1
single filer
Insiders (365d)
71
38 buys · 10 sales
Latest short DTC
7.61
as of 2026-05-29

13D/G Filings Timeline · 3 total

FiledFormFilerStakeSharesIntent
2025-03-17 SCHEDULE EcoR1 Capital, LLC 24.20% 16,858,418 view →
2025-02-18 SCHEDULE EcoR1 Capital, LLC 22.80% 15,720,161 view →
2025-01-13 SCHEDULE EcoR1 Capital, LLC 22.40% 15,411,078 view →

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-05-13 Schneider Paul R officer Award 178,000 $24.57 $4.37M
2026-05-13 Schneider Paul R officer Award 119,000
2026-04-09 Schayowitz Adam officer Award 70,000 $27.35 $1.91M
2026-04-09 Platshon Scott officer Award 70,000 $27.35 $1.91M
2026-04-09 Platshon Scott officer Award 47,000
2026-04-09 Platshon Scott officer Award 76,000
2026-04-09 Schayowitz Adam officer Award 47,000
2026-04-09 Schayowitz Adam officer Award 76,000
2026-04-06 Stafford Kristin officer Award 178,000 $25.84 $4.60M
2026-04-06 Stafford Kristin officer Award 119,000
2026-04-06 Stafford Kristin officer Award 50,000
2026-01-12 Hollywood Mark officer Option exercise 17,666
2026-01-12 Cherry Brian N director Award 23,000 $23.16 $533K
2026-01-12 Smith Jeffrey T L officer Option exercise 17,666
2026-01-12 Ciongoli Gregory Austin director Award 11,500 $23.16 $266K
2026-01-12 Neu Kelvin director Award 11,500 $23.16 $266K
2026-01-12 Landry Robert E director Award 11,500 $23.16 $266K
2026-01-12 Cesano Alessandra director Award 11,500 $23.16 $266K
2026-01-12 Campoy Carlos director Award 11,500 $23.16 $266K
2026-01-12 Mahony Susan director Award 11,500 $23.16 $266K
2026-01-12 Moore Paul Andrew officer Option exercise 17,666
2026-01-12 Galbraith Kenneth director, officer Option exercise 64,000
2026-01-12 Galbraith Kenneth director, officer Sale 30,424 $22.67 $690K
2026-01-12 Galbraith Kenneth director, officer Option exercise 64,000
2026-01-12 Galbraith Kenneth director, officer Award 216,000 $23.16 $5.00M
Showing 25 of 71

FINRA Short Interest History

SettlementShort InterestDays to Cover% Δ vs prior
2026-05-29 4,527,668 7.61 +1.3%
2026-05-15 4,470,973 6.64 -3.8%
2026-04-30 4,648,225 8.40 -0.1%
2026-04-15 4,652,176 7.00 +4.3%
2026-03-31 4,461,520 8.06 +9.4%
2026-03-13 4,078,338 4.21 -1.4%
2026-02-27 4,135,418 9.03 +4.1%
2026-02-13 3,973,308 7.22 +5.2%
2026-01-30 3,777,909 5.88 -1.2%
2026-01-15 3,823,322 2.98 +6.1%
2025-12-31 3,603,765 6.44 -8.5%
2025-12-15 3,938,970 5.68 -29.8%

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