Company: SION
Filing Date: 2025-04-29
Form Type: DEF 14A
Source: 0001193125-25-101830
Chunk: 36

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-04-29
Form: DEF 14A
Chunk 36
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 as the chair of the compensation committee, each payable in quarterly installments, as well as reimbursement for reasonable travel expenses incurred by Dr. Viney for her attendance at meetings of our board of directors. Indemnification Agreements We have entered into a customary indemnification agreement with each of our directors. Non-EmployeeDirector Compensation Policy (Effective February 6, 2025) In January 2025, our board of directors adopted a non-employeedirector compensation policy that became effective on February 6, 2025, the date on which the registration statement of our initial public offering was declared effective by the SEC. 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)                     |     | $ |  4,500 |
| Chair                                          |     | $ |  9,000 |

The non-employeedirector compensation policy provides that, upon initial election or appointment to our board of directors, each non-employeedirector will be granted an initial, one-timeequity award consisting of a stock option grant to purchase 39,919 shares of our common stock (the “Initial Grant”). The Initial Grant will vest in equal annual installments over three years following the grant date, subject to continued service through the applicable vesting date. Mses. Ruddy and