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CIK 0001937653 · Non-accelerated filer<br>Smaller reporting company

Zymeworks Inc.

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Ticker
ZYME
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
FY end
Dec 31
Incorporated
DE
Entity type
operating
EIN
883099146
Phone
302-274-8744
Business address
108 PATRIOT DRIVE, SUITE A, MIDDLETOWN, DE, 19709
Former names
Zymeworks Delaware Inc.
Open-market buys, last 90 days
$0
in 0 filings
Open-market sales, last 90 days
$357,557
in 1 filing

Net −$357,557. Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.

Pace of trading Bought Sold

Who's trading

90 days

  1. Schayowitz Adam −$358K EVP, Head of R&D sold 37% of stake
Date Insider Transaction Shares Price Value Owned after
2026-01-05 Moore Paul Andrew Chief Scientific Officer Option exercise +17,168 40,501
2026-01-05 Moore Paul Andrew Chief Scientific Officer Sale −9,289 $25.10 $233K 31,212
2026-01-05 Moore Paul Andrew Chief Scientific Officer Option exercise +20,000 51,212
2026-01-05 Moore Paul Andrew Chief Scientific Officer Sale −10,821 $25.10 $272K 40,391
2026-01-05 Moore Paul Andrew Chief Scientific Officer Option exercise · Restricted Stock Unit −17,168 0
2026-01-05 Moore Paul Andrew Chief Scientific Officer Option exercise · Restricted Stock Unit −20,000 20,000
2025-12-22 Galbraith Kenneth Chair & CEO Option exercise +100,000 180,803
2025-12-22 Galbraith Kenneth Chair & CEO Sale −47,528 $27.02 $1.3M 133,275
2025-12-22 Galbraith Kenneth Chair & CEO Option exercise · Restricted Stock Unit −100,000 0
2025-08-12 Ciongoli Gregory Austin Director Grant or award +415,000 $12.02 $5.0M 488,500
2025-08-11 Ciongoli Gregory Austin Director Grant or award · Stock Option (Right to Buy) +62,000 62,000
2025-08-11 Landry Robert E Director Grant or award · Stock Option (Right to Buy) +62,000 62,000
2025-06-26 EcoR1 Capital, LLC Director Option exercise +5,086,480 $0.00 $509 22,970,388
2025-06-26 EcoR1 Capital, LLC Director Shares withheld for taxes −41 $12.71 $521 22,970,388
2025-06-26 EcoR1 Capital, LLC Director Option exercise · Pre-Funded Warrants (right to acquire) −5,086,521 0
2025-05-19 EcoR1 Capital, LLC Director Purchase +5,919 $11.78 $70K 17,883,908
2025-05-15 EcoR1 Capital, LLC Director Purchase +49,502 $11.43 $566K 17,877,989
2025-04-17 EcoR1 Capital, LLC Director Purchase +54,760 $11.52 $631K 17,828,487
2025-04-16 EcoR1 Capital, LLC Director Purchase +73,953 $11.16 $826K 17,773,727
2025-04-04 EcoR1 Capital, LLC Director Purchase +196,438 $11.17 $2.2M 17,699,774

Page 4 of 12 · 224 trades