Company: SION
Filing Date: 2025-02-07
Form Type: 424B4
Source: 0001193125-25-022709
Chunk: 283

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-07
Form: 424B4
Chunk 283
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,237 shares of common stock issuable upon the conversion of Series B preferred stock held by RA Capital Nexus Fund III, L.P. (“Nexus III”), (x) 746,847 shares of common stock issuable upon                    
 the conversion of Series C preferred stock held by Nexus III, (xi) 147,833 shares of common stock held by Blackwell Partners LLC—Series A (“Blackwell”), (xii) 94,486 shares of common stock issuable upon the conversion of Series                      
 Seed preferred stock held by Blackwell and (xiii) 85,489 shares of common stock issuable upon the conversion of Series A preferred stock held by Blackwell. RA Capital Management, LP (“RACM”) is the investment adviser to RACHF, Nexus, Nexus          
 III and Blackwell. RA Capital Management GP, LLC (“RACM GP”) is the general partner of RACM. Peter Kolchinsky and Rajeev Shah are the managing members of RACM GP and may be deemed to have voting and investment power over the shares held by          
 RACHF, Nexus, Nexus III and Blackwell. RACM, RACM GP, Peter Kolchinsky and Rajeev Shah disclaim beneficial ownership of the shares owned by RACHF, Nexus, Nexus III and Blackwell, except to the extent of their pecuniary interest therein, if any. The 
 address for each of these entities and individuals is 200 Berkeley Street, 18th Floor, Boston, MA 02116.                                                                                                                                                 |

| (4) | Consists of 1,928,030 shares of common stock issuable upon the conversion of Series C preferred stock held by Sionna                                                                                                                                      
 Aggregator, LP. (“Sionna Aggregator”), a limited partnership affiliated with Enavate Sciences. Enavate Sciences GP, LLC (“Enavate GP”) is the general partner of Sionna Aggregator. Voting, investment and dispositive power with                         
 respect to the shares held by Sionna Aggregator are made collectively by the managers of Enavate GP: Jim Momtazee, Laura Furmanski, Neel Varshney and James P. Boylan, each of whom expressly disclaims beneficial ownership of the shares. H. Edward     
 Fleming, Jr., M.D. is an executive vice president at Enavate Sciences and a member of our board of directors and expressly disclaims beneficial ownership of the shares held by Sionna Aggregator.