Company: SION
Filing Date: 2025-01-17
Form Type: S-1
Source: 0001193125-25-008474
Chunk: 226

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-01-17
Form: S-1
Chunk 226
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on extending our diversity and inclusion initiatives across our entire workforce.

Facilities

Our corporate headquarters is located in Waltham, Massachusetts, where we lease and occupy approximately 24,051 square feet of laboratory and office
space at 21 Hickory Drive, Suite 500, Waltham, Massachusetts 02451. We sublease approximately 6,399 square feet of such laboratory and office space. The current term of our lease expires in November 2030.

We believe that our facilities are adequate for our current needs and for the foreseeable future. To meet the future needs of our business, we may lease
additional or alternate space. We believe that suitable additional or substitute space at commercially reasonable terms will be available as needed to accommodate any future expansion of our operations.

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Legal Proceedings

From time to time, we may become involved in legal proceedings arising from the ordinary course of business. We record a liability for such matters when
it is probable that future losses will be incurred and that such losses can be reasonably estimated. Significant judgment by us is required to determine both probability and the estimated amount. Our management is currently not aware of any legal
matters that could have a material effect on our financial position, results of operations or cash flows.

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MANAGEMENT Executive Officers, Key Employees and Directors The following table sets forth information regarding our executive officers, key employees and directors as of December 31, 2024.

| Name                            |     | Age |    |     | Position                                                  |
| Executive Officers:             |     |     |    |     |                                                           |
| Michael Cloonan, M.B.A.         |     |     | 53 |     | Chief Executive Officer, President and Director           |
| Charlotte McKee, M.D.           |     |     | 60 |     | Chief Medical Officer                                     |
| Elena Ridloff, C.F.A.           |     |     | 45 |     | Chief Financial Officer and Head of Corporate Development |
| Non-Employee Directors:         |     |     |    |     |                                                           |
| Paul Clancy, M.B.A.(2)(3)       |     |     | 63 |     | Chairperson of the Board                                  |
| Bruce Booth, D.Phil.(1)         |     |     | 50 |     | Director                                                  |
| H. Edward Fleming, Jr., M.D.(2) |     |     | 61 |     | Director                                                  |
| Lucian Iancovici, M.D