Sionna Therapeutics Inc
SION · US
Sionna Therapeutics Inc is held by 1 of the 24 tracked investors in their latest 13F filings. The largest position is Viking Global Investors's at $141M, 0.40% of that portfolio. In the last 90 days insiders sold 1 times ($21.6M) and bought 0 times on the open market.
Big investors holding this stock
Latest 13F of the 24 tracked investors. Common shares only.
| Investor | Value ($) | vs prior quarter |
|---|---|---|
| Viking Global Investors weight 0.40% · Q2 2026 |
141M | – |
5%+ holders (13D/13G)
SEC| Holder | Stake | Change |
|---|---|---|
| Ra Capital Management, L.P. Active |
14.3% | New filing |
Insider trades (90 days)
SEC Form 4| Insider | Trade | Amount ($) |
|---|---|---|
| Ra Capital Management, L.P. 10% owner · 9/17 |
Sell | 21.6M |
Questions
Which big investors own Sionna Therapeutics Inc?
Viking Global Investors ($141M), per their latest 13F filings.
Does Warren Buffett own Sionna Therapeutics Inc?
Berkshire Hathaway did not report it in its latest 13F.
Does Korea's National Pension Service own Sionna Therapeutics Inc?
Not in its latest 13F.
Have Sionna Therapeutics Inc insiders been selling?
1 open-market sales ($21.6M) and 0 purchases in the last 90 days; 0 of the sales were under pre-arranged 10b5-1 plans.
Restated and computed from SEC (13F, 13D/G, Form 4) and DART filings and NPS public data. Filings describe a past date and may differ from current holdings (13F: quarter end, up to 45 days later). Not investment advice.
Sources: SEC EDGAR, DART, data.go.kr (NPS), OpenFIGI. See Methodology for how figures are computed.