Sionna Therapeutics, Inc.

Atlas Venture Life Science Advisors, LLC SION

Report date

12/31/2025

Quarter

2025 Q4

Filed

2/13/2026

Shares

2,995,602

Value ($000)

123,239

Weight

14.2%

2025 Q2 - 2025 Q4 (3 filings)

Shares History

History scope: non-option holdings only (PUT/CALL rows excluded).

All 13F Holders	Filing date	Value ($000s)	% of Holdings	Shares	Reporting period
2025 Q4	2/13/2026	123,239	14%	2,995,602	12/31/2025
2025 Q3	11/13/2025	106,333	14%	3,615,527	9/30/2025
2025 Q2	8/12/2025	64,091	9.7%	3,694,020	6/30/2025