Company: SION
Filing Date: 2025-02-18
Form Type: SCHEDULE 13D
Source: 0001839882-25-009559
Chunk: 1

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-18
Form: SCHEDULE 13D
Chunk 1
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   Date:        02/18/2025                            |

| James G. Coulter |

| Signature:   /s/ Gerald Neugebauer                                    
   Name/Title:  Gerald Neugebauer, on behalf of James G. Coulter (1)   
   Date:        02/18/2025                                             |

| Jon Winkelried |

| Signature:   /s/ Gerald Neugebauer                                  
   Name/Title:  Gerald Neugebauer, on behalf of Jon Winkelried (2)   
   Date:        02/18/2025                                           |

| Comments accompanying signature:(1) Gerald Neugebauer is signing on behalf of Mr. Coulter pursuant to an authorization and designation letter dated January 10, 2024, which was previously filed with the Commission as an exhibit to a Form 4 filed by Mr. Coulter on February 7, 2024 (SEC File No. 001-41617). 
 (2) Gerald Neugebauer is signing on behalf of Mr. Winkelried pursuant to an authorization and designation letter dated January 10, 2024, which was previously filed with the Commission as an exhibit to a Form 4 filed by Mr. Winkelried on February 7, 2024 (SEC File No. 001-41617).                           |