Who owns Definium Therapeutics, 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.
Commodore Capital LP: 1.8% · 2,410,000 shares — Commodore Capital Master LP: 1.8% · 2,410,000 shares — Robert Egen Atkinson: 1.8% · 2,410,000 shares
DRIEHAUS CAPITAL MANAGEMENT LLC: 5.4% · 6,845,276 shares
3 more 5% stakes behind a free account
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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 Definium Therapeutics Inc they hold. Together these 409 managers report 93.22% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. | $528M | 11,232,834 | 0.01% | 8.36% | June 30, 2026 |
| Avoro Capital Advisors LLC | $338M | 7,188,888 | 3.04% | 5.35% | June 30, 2026 |
407 more institutional holders behind a free account
See every manager reporting Definium Therapeutics Inc, how much of the company they hold, and how big the position is inside their own portfolio.
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 217 funds hold 25.02% 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 |
|---|---|---|---|---|
| SMALLCAP World Fund Inc | $362M | 0.38% | 5.72% | June 30, 2026 |
| VANGUARD EXTENDED MARKET INDEX FUND | $69.9M | 0.07% | 1.11% | June 30, 2026 |
215 more funds behind a free account
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