Filing Details

Accession Number:
0001415889-25-004453
Form Type:
13D Filing
Publication Date:
2025-02-17 19:00:00
Filed By:
Atlas Venture Fund XI, L.P.
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
Atlas Venture Fund XI, L.P. 0 2,886,293 0 2,886,293 2,886,293 6.5%
Atlas Venture Associates XI, L.P. 0 2,886,293 0 2,886,293 2,886,293 6.5%
Atlas Venture Associates XI, LLC 0 2,886,293 0 2,886,293 2,886,293 6.5%
Atlas Venture Opportunity Fund II, L.P. 0 807,727 0 807,727 807,727 1.8%
Atlas Venture Associates Opportunity II, LP 0 807,727 0 807,727 807,727 1.8%
Atlas Venture Associates Opportunity II, LLC 0 807,727 0 807,727 807,727 1.8%
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





SCHEDULE 13D

 
Atlas Venture Fund XI, L.P.
 
Signature:/s/ Ommer Chohan
Name/Title:Atlas Venture Associates XI, L.P., its GP, By Atlas Venture Associates XI, LLC, its GP, By: Ommer Chohan, CFO
Date:02/18/2025
 
Atlas Venture Associates XI, L.P.
 
Signature:/s/ Ommer Chohan
Name/Title:Atlas Venture Associates XI, LLC, its GP, By: Ommer Chohan, CFO
Date:02/18/2025
 
Atlas Venture Associates XI, LLC
 
Signature:/s/ Ommer Chohan
Name/Title:Ommer Chohan, CFO
Date:02/18/2025
 
Atlas Venture Opportunity Fund II, L.P.
 
Signature:/s/ Ommer Chohan
Name/Title:Atlas Venture Associates Opportunity II, L.P., its GP, By: Atlas Venture Associates Opportunity II, LLC, its GP, By: Ommer Chohan, CFO
Date:02/18/2025
 
Atlas Venture Associates Opportunity II, LP
 
Signature:/s/ Ommer Chohan
Name/Title:Atlas Venture Associates Opportunity II, LLC, its GP, By: Ommer Chohan, CFO
Date:02/18/2025
 
Atlas Venture Associates Opportunity II, LLC
 
Signature:/s/ Ommer Chohan
Name/Title:By: Ommer Chohan, CFO
Date:02/18/2025