Company: SION
Filing Date: 2025-01-17
Form Type: S-1
Source: 0001193125-25-008474
Chunk: 283

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-01-17
Form: S-1
Chunk 283
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 Investors LP (“VGI”), which provides managerial services to the Drawdown Fund and the Opportunities Fund, has the authority to dispose of and vote the shares held by the Opportunities Fund and the Drawdown Fund. O. Andreas Halvorsen, David    
 C. Ott and Rose Shabet, as Executive Committee members of Viking Global Partners LLC (the general partner of VGI) and Viking Global Opportunities Parent GP LLC, the sole member of each of (a) Viking Global Opportunities Drawdown GP LLC (which 
 is the sole member of the Drawdown GP) and (b) Viking Global Opportunities GP LLC (which is the sole member of the Opportunities GP), have shared authority to direct the voting and disposition of investments beneficially owned by VGI, the     
 Opportunities GP and the Drawdown GP, respectively. The address of each of these entities and individuals is c/o Viking Global Investors LP, 600 Washington Blvd. Floor 11, Stamford, CT 06901.                                                    |

| (7) | Consists of (i) 799,724 shares of restricted common stock and (ii) 584,298 shares of common stock subject to options 
 exercisable within 60 days of December 31, 2024.                                                                     |

| (8) | Consists of (i) 41,518 shares of restricted common stock and (ii) 164,776 shares of common stock subject to options 
 exercisable within 60 days of December 31, 2024.                                                                    |

| (9) | Consists of (i) 180,500 shares of restricted common stock and (ii) 183,160 shares of common stock subject to options 
 exercisable within 60 days of December 31, 2024.                                                                     |

| (10) | Consists of 131,378 shares of common stock subject to options exercisable within 60 days of December 31, 2024. |

| (11) | Consists of (i) 1,021,742 shares of restricted common stock and (ii) 1,063,612 shares of common stock subject to options                 
 exercisable within 60 days of December 31, 2024, held by executive officers and directors, as described in footnotes 7 through 10 above. |

205

DESCRIPTION OF CAPITAL STOCK

General

The following description of our capital stock and
certain provisions of our fifth amended and restated certificate of incorporation and amended and restated bylaws are summaries and are qualified by reference