Company: SION
Filing Date: 2025-02-03
Form Type: S-1/A
Source: 0001193125-25-018825
Chunk: 259

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-03
Form: S-1/A
Chunk 259
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 awards granted after the New Severance and CIC Plan
Effective Date: (A) extending the time for exercising any stock-based awards beyond 3 months following a termination of service (other than due to death or disability), (B) providing for acceleration of vesting of unvested equity award(s) upon
a termination of employment prior to a change in control or other sales transaction of the Company; and/or (C) providing for acceleration of vesting of unvested equity award(s) upon a change in control or other sales transaction of the Company.

186

Compensation Recovery Policy In accordance with the requirements of the Dodd-Frank Act, final SEC rules, and applicable Nasdaq listing standards, on December 12, 2024, our board of directors adopted a compensation recovery policy in connection with this offering, which will become effective upon the date on which the registration statement of which this prospectus forms a part is declared effective by the SEC. The compensation recovery policy will provide that in the event we are required to prepare a restatement of financial statements due to material noncompliance with any financial reporting requirement under securities laws, we will seek to recover any incentive-based compensation that was based upon the attainment of a financial reporting measure and that was received by any current or former executive officer during the three-year period preceding the date that the restatement was required if such compensation exceeds the amount that the executive officer would have received had the financial results been properly reported. Outstanding Equity Awards at Fiscal 2024 Year-End The following table sets forth information concerning outstanding equity awards held by our NEOs as of December 31, 2024.

|                         |     |            |           |     |              |           |     | Option awards(1) |         |     |               |         |    |     |          |      |     |            |           |     | Stock awards(1) |        |    |     |                 |         |
| Name                    |     | Grant Date |           |     | Vesting      
 Commencement 
 Date         |           |     | Number of        
 securities       
 underlying       
 unexercised      
 options (#)      
 exercisable      |         |     | Number of     
 securities    
 underlying    
 unexercised   
 options (#)   
 unexercisable |         |    |     | Option   
 exercise 
 price    
 ($)      |      |     | Option     
 expiration 
 date       |           |     | Number of       
 shares or       
 units of stock  
 that have       
 not vested