Company: SION
Filing Date: 2025-01-17
Form Type: S-1
Source: 0001193125-25-008474
Chunk: 290

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-01-17
Form: S-1
Chunk 290
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holder owned at least 85% of the voting stock of the corporation outstanding at the time the transaction commenced, excluding for purposes of determining the voting stock outstanding, shares owned by persons who are directors and also officers, 
 and employee stock plans, in some instances, but not the outstanding voting stock owned by the interested stockholder; or                                                                                                                                 |

| • |     | at or after the time the stockholder became interested, the business combination was approved by our board of directors and                                                                     
 authorized at an annual or special meeting of the stockholders by the affirmative vote of at least two-thirds of the outstanding voting stock which is not owned by the interested stockholder. |

Section 203 defines a business combination to include:

| • |     | any merger or consolidation involving the corporation and the interested stockholder; |

| • |     | any sale, transfer, lease, pledge or other disposition involving the interested stockholder of 10% or more of the assets of 
 the corporation;                                                                                                            |

| • |     | subject to exceptions, any transaction that results in the issuance or transfer by the corporation of any stock of the 
 corporation to the interested stockholder;                                                                             |

| • |     | subject to exceptions, any transaction involving the corporation that has the effect of increasing the proportionate share 
 of the stock of any class or series of the corporation beneficially owned by the interested stockholder; and               |

| • |     | the receipt by the interested stockholder of the benefit of any loans, advances, guarantees, pledges or other financial 
 benefits provided by or through the corporation.                                                                        |

In general, Section 203 defines an interested stockholder as any entity or person beneficially owning 15% or more of the outstanding voting stock of the corporation and any entity or person affiliated with or controlling or controlled by the entity or person. Choice of Forum Our amended and restated bylaws will provide that the Court of Chancery of the State of Delaware is the sole and exclusive forum for the following claims or causes of action under the Delaware statutory or common law: (i) any derivative action or proceeding brought on our behalf, (ii) any action asserting a claim of, or a claim based on, a breach of a fiduciary duty owed by any of our current or former directors, officers or other employees or stockholders to us or our stockholders, (iii) any action asserting a claim arising pursuant to any provision of the DGCL or our fifth amended and restated certificate of incorporation or amended and restated by