Who owns Sionna 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.
VIKING GLOBAL INVESTORS LP: 7.1% · 3,195,181 shares — Viking Global Opportunities Parent GP LLC: 7.1% · 3,195,181 shares — Viking Global Opportunities GP LLC: 4.5% · 2,039,801 shares
Qatar Investment Authority: 4.5% · 2,020,258 shares — Q Healthcare Holding LLC: 4.5% · 2,020,258 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 Sionna Therapeutics, Inc. they hold. Together these 166 managers report 109.13% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | $436M | 9,905,045 | 3.79% | 21.91% | June 30, 2026 |
| TPG GP A, LLC | $286M | 6,494,962 | 5.71% | 14.37% | June 30, 2026 |
164 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 139 funds hold 14.13% 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 | $41.1M | 0.00% | 2.07% | June 30, 2026 |
| State Street(R) SPDR(R) S&P(R) Biotech ETF | $28.5M | 0.27% | 1.43% | June 30, 2026 |
137 more funds behind a free account
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