Atlas Venture Fund XI, L.P. 13D and 13G filings for Sionna Therapeutics, Inc.:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2025-10-20 9:40 pm Sale | 2025-10-16 | 13D | SIONNA THERAPEUTICS INC SION | Atlas Venture Fund XI, L.P. | 2,382,495 5.400% | -503,798 (-17.45%) | Filing |
| 2025-02-18 4:59 pm Purchase | 2025-02-10 | 13D | SIONNA THERAPEUTICS INC SION | Atlas Venture Fund XI, L.P. | 2,886,293 6.500% | 2,886,293 (New Position) | Filing |