Who owns Zymeworks Inc., from the filings themselves: stakes over 5% (Schedule 13D/G), the institutional managers reporting the stock each quarter (13F), and the funds holding it (N-PORT).
Investors crossing 5% ownership must disclose it. Schedule 13G filers certify the stake is passive; Schedule 13D is the general form for everyone else — founders, strategic holders, and activists alike. Each entry is the holder's most recent disclosure. Coverage begins with SEC's structured filings from December 18, 2024; a holder appears once they file or amend after that date.
Rubric Capital Management LP: 9.5% · 7,000,000 shares — David Rosen: 9.5% · 7,000,000 shares
Perceptive Advisors LLC: 5.4% · 3,974,579 shares — Joseph Edelman: 5.4% · 3,974,579 shares — Perceptive Life Sciences Master Fund, Ltd.: 5.4% · 3,974,579 shares
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Sign up freeEvery institutional manager whose latest 13F reports this stock, largest position first. "% of their portfolio" is the weight inside that manager's own book — how much conviction the position represents; "% of company" is how much of Zymeworks Inc. they hold. Together these 269 managers report 109.25% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | $600M | 22,970,388 | 29.19% | 32.37% | June 30, 2026 |
| Rubric Capital Management LP | $183M | 7,000,000 | 1.68% | 9.86% | June 30, 2026 |
267 more institutional holders behind a free account
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Sign up freeFunds disclosing this stock in their monthly N-PORT portfolio, with the position's share of the fund's net assets. Together these 201 funds hold 15.62% of shares outstanding — counted inside the manager totals above, not on top of them, since a fund's shares also appear in its manager's 13F.
| Fund | Position value | % of net assets | % of company | As of |
|---|---|---|---|---|
| VANGUARD TOTAL STOCK MARKET INDEX FUND | $39.4M | 0.00% | 2.13% | June 30, 2026 |
| iShares Russell 2000 ETF | $30.5M | 0.04% | 1.72% | March 31, 2026 |
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