Company · Ownership research

Zymeworks Inc. ZYME

CIK 0001937653

Form 4 transactions dated Nov 1, 2023 to Nov 10, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through Oct 9, 2026.

Insider purchases & sales

Purchased: $58.04M
Sold: $6.80M

Nov 1, 2023 – Oct 9, 2026
Available records · partial months are marked ·

202410 of 14 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Dec 31, 2024	EcoR1 Capital, LLC Director · 10% owner	Purchase	$2.13M 146,501 shares bought	0.98% added Indirect holding	▾
Dec 30, 2024	EcoR1 Capital, LLC Director · 10% owner	Purchase	$853.33K 58,988 shares bought	0.40% added Indirect holding	▾
Dec 27, 2024	EcoR1 Capital, LLC Director · 10% owner	Purchase	$1.47M 101,659 shares bought	0.69% added Indirect holding	▾
Dec 26, 2024	EcoR1 Capital, LLC Director · 10% owner	Purchase	$240.04K 16,692 shares bought	0.11% added Indirect holding	▾
Dec 24, 2024	EcoR1 Capital, LLC Director · 10% owner	Purchase	$168.90K 11,958 shares bought	0.08% added Indirect holding	▾
Dec 23, 2024	EcoR1 Capital, LLC 10% owner	Purchase	$3.58M 251,502 shares bought	1.74% added Indirect holding	▾
Dec 20, 2024	EcoR1 Capital, LLC 10% owner	Purchase	$9.92M 704,488 shares bought	5.13% added Indirect holding	▾
Dec 19, 2024	EcoR1 Capital, LLC 10% owner	Purchase	$4.04M 298,818 shares bought	2.22% added Indirect holding	▾
Jan 8, 2024	Galbraith Kenneth Chair & CEO · Director	Sale	$64.00K 5,706 shares sold	19.36% sold Direct holding	▾
Jan 8, 2024	Astle Christopher SVP & Chief Financial Officer	Sale	$16.05K 1,431 shares sold	18.04% sold Direct holding	▾

Showing 14 / 14 record groups in 2024. The complete set is available through the API.

Zymeworks Inc. · ZYME

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{"action":"list","ticker":"ZYME","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Share totals are on today's split-adjusted basis. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.