Company: SION
Filing Date: 2025-02-03
Form Type: S-1/A
Source: 0001193125-25-018825
Chunk: 277

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-03
Form: S-1/A
Chunk 277
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 an initial equity grant pursuant to the non-employeedirector compensation policy. In addition, Ms. Viney is entitled to an annual cash retainer of $40,000 for her role as a director as well as reimbursement for reasonable travel expenses incurred by Ms. Viney for her attendance at meetings of our board of directors, and, contingent upon the consummation of this offering, consistent with the terms of the non-employee director compensation policy, $12,000 for her role as the chair of the compensation committee, in each case, payable quarterly. Indemnification Agreements We have entered into customary indemnification agreements with each of our directors. In addition, in connection with this offering, we intend to enter into new indemnification agreements with each of our directors. For more information regarding these agreements, see the section titled “ Management—Limitations on Liability and Indemnification.” Non-EmployeeDirector Compensation Policy In connection with this offering, our board of directors adopted a non-employeedirector compensation policy, to be effective as of the date on which the registration statement of which this prospectus forms a part is declared effective by the SEC, and which will supersede all existing board of directors agreements. The policy is designed to enable us to attract and retain, on a long-term basis, highly qualified non-employeedirectors. Under the policy, our non-employeedirectors will be eligible to receive cash retainers (which will be payable quarterly in arrears and prorated for partial years of service) and equity awards as set forth below:

| Annual Retainer for Board Membership           |     |   |        |
|:-----------------------------------------------|:----|:--|-------:|
| Members                                        |     | $ | 40,000 |
| Additional Retainer for Non-executive Chair    |     | $ | 30,000 |
| Additional Retainer for Committee Membership   |     |   |        |
| Audit Committee:                               |     |   |        |
| Members (other than chair)                     |     | $ |  8,000 |
| Chair                                          |     | $ | 16,000 |
| Compensation Committee:                        |     |   |        |
| Members (other than chair)                     |     | $ |  6,000 |
| Chair                                          |     | $ | 12,000 |
| Nominating and Corporate Governance Committee: |     |   |        |
| Members (other than chair)                     |     |