Company: SION
Filing Date: 2025-02-03
Form Type: S-1/A
Source: 0001193125-25-018825
Chunk: 16

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-03
Form: S-1/A
Chunk 16
---
emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012, as amended (the “JOBS Act”). As an emerging growth company, we may take advantage of specified reduced disclosure and other requirements that are otherwise applicable generally to public companies. These provisions include:

| • |     | being permitted to present only two years of audited consolidated financial statements, in addition to any required                                                                                      
 unaudited interim consolidated financial statements, with correspondingly reduced “Management’s Discussion and Analysis of Financial Condition and Results of Operations” disclosure in this prospectus; |

| • |     | reduced disclosure about our executive compensation arrangements; |

| • |     | not being required to hold advisory votes on executive compensation or to obtain stockholder approval of any golden 
 parachute arrangements not previously approved;                                                                     |

| • |     | an exemption from the auditor attestation requirement in the assessment of our internal control over financial reporting 
 pursuant to Section 404 of the Sarbanes-Oxley Act of 2002 (“Sarbanes-Oxley Act”); and                                    |

| • |     | an exemption from compliance with the requirements of the Public Company Accounting Oversight Board regarding the 
 communication of critical audit matters in the auditor’s report on the consolidated financial statements.         |

We may take advantage of these exemptions for up to five years or such earlier time that we are no longer an emerging growth company. We may choose to take advantage of some but not all of these exemptions. We would cease to be an emerging growth company on the date that is the earliest of (i) the last day of the fiscal year in which we have total annual gross revenues of $1.235 billion or more; (ii) the last day of our fiscal year following the fifth anniversary of the date of the completion of this offering; (iii) the date on which we have issued more than $1.0 billion in nonconvertible debt during the previous three years; or (iv) the date on which we are deemed to be a large accelerated filer under the rules of the SEC. We have taken advantage of reduced reporting requirements in this prospectus. Accordingly, the information contained herein may be different from the information you receive from other public companies in which you hold stock. Additionally, the JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards. This allows an emerging growth company to delay the adoption of certain accounting standards until those standards would otherwise apply to private