SEC 13F Intelligence

Atlas Venture Life Science Advisors, LLC / SION

Atlas Venture Life Science Advisors, LLC’s Sionna Therapeutics Inc Position

Does Atlas Venture Life Science Advisors, LLC own Sionna Therapeutics Inc (SION)? Yes — 3.00M shares worth $120M (+15.20% of its 13F portfolio) as of Q1 2026.

Position Value
$120M
Q1 2026
Shares
3.00M
% of Portfolio
+15.20%
Quarters Held
5
currently held

Position History SION

Reported value by quarter
Q1 ’25: $39MQ1 ’25Q2 ’25: $64MQ2 ’25Q3 ’25: $106MQ3 ’25Q4 ’25: $123MQ4 ’25Q1 ’26: $120MQ1 ’26filingsflow.com
QuarterSharesValue% of Portfolio
Q1 20263.00M$120M+15.20%
Q4 20253.00M$123M+14.24%
Q3 20253.62M$106M+14.13%
Q2 20253.69M$64M+9.68%
Q1 20253.69M$39M+7.41%

Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See Atlas Venture Life Science Advisors, LLC’s full portfolio or all institutional holders of SION.