Company: SION
Filing Date: 2025-01-17
Form Type: S-1
Source: 0001193125-25-008474
Chunk: 271

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-01-17
Form: S-1
Chunk 271
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 committee, in each case, payable quarterly.

Marcella Ruddy

On December 18, 2024, we entered into a board of directors agreement with Marcella Ruddy (the “Ruddy Agreement”) pursuant to which Ms.
Ruddy serves as a director and member of the nominating and corporate governance committee, effective as of January 6, 2025. Under the Ruddy Agreement, and subject to Board approval, Ms. Ruddy is entitled to receive an initial equity grant
pursuant to the non-employee director compensation policy. In addition, Ms. Ruddy 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. Ruddy 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, $4,500 for her role
as a member of the nominating and corporate governance committee, in each case, payable quarterly.

195

Joanne Viney On December 18, 2024, we entered into a board of directors agreement with Joanne Viney (the “Viney Agreement”) pursuant to which Ms. Viney serves as a director and the chair of the compensation committee, effective as of January 6, 2025. Under the Viney Agreement, and subject to Board approval, Ms. Viney is entitled to receive 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 intends to adopt a non-employeedirector