Who owns First Tracks Biotherapeutics, 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.
TCG Crossover GP II, LLC: 4.1% · 1,447,652 shares — TCG Crossover Fund II, L.P.: 4.1% · 1,447,652 shares — TCG Crossover GP III, LLC: 4.1% · 1,447,652 shares
Sirenia Capital Management LP: 7.2% · 2,495,777 shares — Alex Silverstein: 7.2% · 2,495,777 shares
4 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 First Tracks Biotherapeutics, Inc. they hold. Together these 149 managers report 91.11% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | $63.9M | 3,174,519 | 3.11% | 8.88% | June 30, 2026 |
| TCG Crossover Management, LLC | $58.3M | 2,895,304 | 1.40% | 8.10% | June 30, 2026 |
147 more institutional holders behind a free account
See every manager reporting First Tracks Biotherapeutics, 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 102 funds hold 13.23% 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 | $22.4M | 0.00% | 3.11% | June 30, 2026 |
| State Street(R) SPDR(R) S&P(R) Biotech ETF | $18.7M | 0.17% | 2.60% | June 30, 2026 |
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