Are insiders buying ZYME stock?

Yes — 2 distinct insiders have bought ZYME (Zymeworks Inc.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was May 19, 2025.

How much ZYME stock have insiders bought?

Insiders have bought a combined $40.4M of ZYME across 31 open-market purchases, based on SEC Form 4 filings.

What is an insider cluster buy in ZYME?

A cluster buy is two or more distinct Zymeworks Inc. insiders — officers, directors, or 10% owners — each buying ZYME on the open market within a rolling window. ZYME has 1 detected cluster buy to date.

Where does this ZYME insider trading data come from?

Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

ZYME insider buying

1 cluster buy

Zymeworks Inc. · Healthcare

When two or more insiders at Zymeworks Inc. buy ZYME on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in ZYME plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.

Clusters

Distinct insiders

Total bought

$40.4M

Market cap

$1.9B

Detected clusters

Mar 11 – Apr 17, 2025
Detected Apr 17, 2025
2 insiders
Total bought
$25.4M
Market cap
$1.9B

All notable open-market buys in ZYME

Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.

Date	Insider	Shares	Price	Value	Filing
May 15, 2025	EcoR1 Capital, LLC Director, 10% Owner	49,502	$11.43	$565.8K	SEC ↗
Apr 17, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	54,760	$11.52	$630.8K	SEC ↗
Apr 16, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	73,953	$11.16	$825.3K	SEC ↗
Apr 4, 2025	NODELMAN OLEGcluster Director, 10% Owner	196,438	$11.17	$2.2M	SEC ↗
Apr 3, 2025	NODELMAN OLEGcluster Director, 10% Owner	120,770	$11.84	$1.4M	SEC ↗
Apr 2, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	74,360	$11.85	$881.2K	SEC ↗
Apr 1, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	48,658	$11.60	$564.4K	SEC ↗
Mar 26, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	43,848	$12.24	$536.7K	SEC ↗
Mar 25, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	53,501	$12.91	$690.7K	SEC ↗
Mar 24, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	22,689	$13.08	$296.8K	SEC ↗
Mar 21, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	31,033	$12.78	$396.6K	SEC ↗
Mar 20, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	73,476	$12.93	$950.0K	SEC ↗
Mar 19, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	58,306	$12.64	$737.0K	SEC ↗
Mar 18, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	113,880	$12.65	$1.4M	SEC ↗
Mar 17, 2025	EcoR1 Capital, LLCcluster Director, 10% Owner	56,277	$12.23	$688.3K	SEC ↗
Mar 13, 2025	NODELMAN OLEGcluster Director, 10% Owner	468,356	$12.48	$5.8M	SEC ↗
Mar 12, 2025	NODELMAN OLEGcluster Director, 10% Owner	292,934	$12.25	$3.6M	SEC ↗
Mar 11, 2025	NODELMAN OLEGcluster Director, 10% Owner	320,690	$11.49	$3.7M	SEC ↗
Jan 17, 2025	EcoR1 Capital, LLC Director, 10% Owner	19,748	$13.87	$273.9K	SEC ↗
Jan 16, 2025	EcoR1 Capital, LLC Director, 10% Owner	121,681	$13.89	$1.7M	SEC ↗
Jan 15, 2025	EcoR1 Capital, LLC Director, 10% Owner	39,029	$14.01	$546.8K	SEC ↗
Jan 14, 2025	EcoR1 Capital, LLC Director, 10% Owner	54,500	$13.56	$739.0K	SEC ↗
Jan 13, 2025	EcoR1 Capital, LLC Director, 10% Owner	74,125	$13.39	$992.5K	SEC ↗
Jan 10, 2025	EcoR1 Capital, LLC Director, 10% Owner	204,098	$13.13	$2.7M	SEC ↗
Jan 8, 2025	EcoR1 Capital, LLC Director, 10% Owner	21,021	$14.07	$295.8K	SEC ↗

6 earlier buys hidden — sign in free to see the full history.

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ZYME insider buying — FAQ

Are insiders buying ZYME stock?: Yes — 2 distinct insiders have bought ZYME (Zymeworks Inc.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was May 19, 2025.
How much ZYME stock have insiders bought?: Insiders have bought a combined $40.4M of ZYME across 31 open-market purchases, based on SEC Form 4 filings.
What is an insider cluster buy in ZYME?: A cluster buy is two or more distinct Zymeworks Inc. insiders — officers, directors, or 10% owners — each buying ZYME on the open market within a rolling window. ZYME has 1 detected cluster buy to date.
Where does this ZYME insider trading data come from?: Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

How we track insider buying in ZYME

We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy ZYME within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?

This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding ZYME.