Company: SION
Filing Date: 2025-02-03
Form Type: S-1/A
Source: 0001193125-25-018825
Chunk: 276

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-03
Form: S-1/A
Chunk 276
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 Ms. Stelzer serves as a director and chair of the audit committee, effective as of November 14, 2024. In accordance
with the Stelzer Agreement in November 2024, Ms. Stelzer was granted an initial equity grant consisting of an option to purchase 44,480 shares of common stock, which vests in equal annual installments over a three-year period following
November 14, 2024, subject to Ms. Stelzer’s continued service with us through each applicable vesting date. In addition, Ms. Stelzer 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. Stelzer 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, $16,000 for her role as the chair of the audit 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.

196

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