RA CAPITAL MANAGEMENT, L.P. - 05 Nov 2025 SCHEDULE 13D/A Report for SIONNA THERAPEUTICS, INC. Common Stock, $0.001 par value per share (SION)

Filing Manager
RA CAPITAL MANAGEMENT, L.P.
Reporting Manager
RA Capital Management, L.P.
Security
SIONNA THERAPEUTICS, INC. Common Stock, $0.001 par value per share
Symbol
SION
Shares outstanding
44,565,097 shares
Disclosed Ownership
10,071,712 shares
Ownership
23%
Form type
SCHEDULE 13D/A
Filing time
07 Nov 2025, 16:59:24 UTC
Date of event
05 Nov 2025
Previous filing
18 Feb 2025
SEC
View on sec.gov

Reporting Managers (5)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
RA Capital Management, L.P. 23% 10,071,712 0 10,071,712 /s/ Peter Kolchinsky By Peter Kolchinsky, Authorized Signatory 0001346824
Peter Kolchinsky 23% 10,071,712 0 10,071,712 /s/ Peter Kolchinsky Peter Kolchinsky 0001384859
Rajeev Shah 23% 10,071,712 0 10,071,712 /s/ Rajeev Shah Rajeev Shah 0001619841
RA Capital Healthcare Fund, L.P. 16% 6,905,625 0 6,905,625 /s/ Peter Kolchinsky By RA Capital Healthcare Fund GP, LLC, its General Partner, By Peter Kolchinsky, Manager 0001315082
RA Capital Nexus Fund III, L.P. 5% 2,240,708 0 2,240,708 /s/ Peter Kolchinsky By RA Capital Nexus Fund III GP, LLC, its General Partner, By Peter Kolchinsky, Manager 0001883840