Question 1

How many shares of SION does RA CAPITAL MANAGEMENT, L.P. own?

Accepted Answer

As of 2026-Q1, RA CAPITAL MANAGEMENT, L.P. holds 9.9M shares of SION (SIONNA THERAPEUTICS INC).

Question 2

What is RA CAPITAL MANAGEMENT, L.P.'s SION position worth?

Accepted Answer

As of 2026-Q1, RA CAPITAL MANAGEMENT, L.P.'s SION position is worth $397.1M.

Question 3

When did RA CAPITAL MANAGEMENT, L.P. first buy SION?

Accepted Answer

Based on available 13F filings, RA CAPITAL MANAGEMENT, L.P. first reported a position in SION in 2026-Q1. They have held the position across 5 quarters.