Filing Details

Accession Number:
0001415889-25-004419
Form Type:
13D Filing
Publication Date:
2025-02-17 19:00:00
Filed By:
RA Capital Management
Company:
Sionna Therapeutics Inc.
Filing Date:
2025-02-18
SEC Url:
13D Filing
Ownership Summary

Please notice the below summary table is generated without human intervention and may contain errors. Please refer to the complete filing displayed below for exact figures.

Name Sole Voting Power Shared Voting Power Sole Dispositive Power Shared Dispositive Power Aggregate Amount Owned Power Percent of Class
RA Capital Management, L.P. 0 10,445,322 0 10,445,322 10,445,322 23.7%
Peter Kolchinsky 0 10,445,322 0 10,445,322 10,445,322 23.7%
Rajeev Shah 0 10,445,322 0 10,445,322 10,445,322 23.7%
RA Capital Healthcare Fund, L.P. 0 6,923,365 0 6,923,365 6,923,365 15.7%
RA Capital Nexus Fund III, L.P. 0 2,324,498 0 2,324,498 2,324,498 5.3%
Filing





If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. Checkbox not checked

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).






SCHEDULE 13D





SCHEDULE 13D





SCHEDULE 13D





SCHEDULE 13D





SCHEDULE 13D





SCHEDULE 13D

 
RA Capital Management, L.P.
 
Signature:/s/ Peter Kolchinsky
Name/Title:By Peter Kolchinsky, Authorized Signatory
Date:02/18/2025
 
Peter Kolchinsky
 
Signature:/s/ Peter Kolchinsky
Name/Title:Peter Kolchinsky
Date:02/18/2025
 
Rajeev Shah
 
Signature:/s/ Rajeev Shah
Name/Title:Rajeev Shah
Date:02/18/2025
 
RA Capital Healthcare Fund, L.P.
 
Signature:/s/ Peter Kolchinsky
Name/Title:By RA Capital Healthcare Fund GP, LLC, its General Partner, By Peter Kolchinsky, Manager
Date:02/18/2025
 
RA Capital Nexus Fund III, L.P.
 
Signature:/s/ Peter Kolchinsky
Name/Title:By RA Capital Nexus Fund III GP, LLC, its General Partner, By Peter Kolchinsky, Manager
Date:02/18/2025