Sionna Therapeutics, Inc. - SION
Ownership (Schedule 13D / 13G) · latest 50 filings
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| Filed | Form | Reporting person | Percent | Shares | SEC |
|---|---|---|---|---|---|
| May 15, 2026 | SCHEDULE 13G/A | VIKING GLOBAL INVESTORS LP | 7.1% | 3,195,181 | View |
| May 15, 2026 | SCHEDULE 13G/A | Viking Global Opportunities Parent GP LLC | 7.1% | 3,195,181 | View |
| May 15, 2026 | SCHEDULE 13G/A | Viking Global Opportunities GP LLC | 4.5% | 2,039,801 | View |
| May 15, 2026 | SCHEDULE 13G/A | Viking Global Opportunities Portfolio GP LLC | 4.5% | 2,039,801 | View |
| May 15, 2026 | SCHEDULE 13G/A | Viking Global Opportunities Illiquid Investments Sub-Master LP | 4.5% | 2,039,801 | View |
| May 15, 2026 | SCHEDULE 13G/A | Viking Global Opportunities Drawdown GP LLC | 2.6% | 1,155,380 | View |
| May 15, 2026 | SCHEDULE 13G/A | Viking Global Opportunities Drawdown Portfolio GP LLC | 2.6% | 1,155,380 | View |
| May 15, 2026 | SCHEDULE 13G/A | Viking Global Opportunities Drawdown (Aggregator) LP | 2.6% | 1,155,380 | View |
| May 15, 2026 | SCHEDULE 13G/A | HALVORSEN OLE ANDREAS | 7.1% | 3,195,181 | View |
| May 15, 2026 | SCHEDULE 13G/A | Shabet Rose Sharon | 7.1% | 3,195,181 | View |
| May 12, 2026 | SCHEDULE 13G/A | Qatar Investment Authority | 4.5% | 2,020,258 | View |
| May 12, 2026 | SCHEDULE 13G/A | Q Healthcare Holding LLC | 4.5% | 2,020,258 | View |
| Apr 20, 2026 | SCHEDULE 13D/A | — | 1.0% | — | View |
Percent = "% of class represented by amount beneficially owned" for this reporting person in the filed 13D/13G.
Shares = reported beneficial ownership amount for the same row (not portfolio shares from 13F).
Amendments (/A) can repeat the same holder over time, so rows should not be summed.
Extraction is best-effort from filing text and can be missing or noisy; verify exact figures via the SEC link in each row.