Company: SION
Filing Date: 2025-02-03
Form Type: S-1/A
Source: 0001193125-25-018825
Chunk: 250

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-03
Form: S-1/A
Chunk 250
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 performance, create an ownership culture, help to align the interests of our executives and our 181

stockholders, and enhance executive retention. The market for qualified and talented executives in the biopharmaceutical industry is highly competitive, and we compete for talent with many
companies that have greater financial resources than we do. Accordingly, we believe equity compensation is a crucial component of any competitive executive compensation package we offer. As such, our board of directors or our compensation committee
periodically reviews the equity incentive compensation of our executives and may grant equity incentive awards to them from time to time.

In
March 2024, following the sale and issuance of our Series C Preferred Stock, pursuant to the Series C Preferred Stock Purchase Agreement, dated as of March 4, 2024, our board of directors granted Mr. Cloonan, Ms. Ridloff and Dr. McKee
an incentive stock option to purchase 656,984, 145,751 and 141,865 shares of our common stock, respectively. Such options vest in 48 equal monthly installments over a period of four years following March 4, 2024, subject to each applicable
NEO’s continued service with us through the applicable vesting dates; provided that the vesting of such shares will fully accelerate upon a “sale event” (as defined in the 2020 Plan and which does not include this offering) and as
provided in the Severance and CIC Agreements and/or the New Severance and CIC Plan (each as defined below). Each NEO’s outstanding awards as of December 31, 2024 are set forth in more detail in the “Outstanding Equity Awards at Fiscal 2024 Year-End” table below.

Perquisites or Personal Benefits

We did not provide perquisites or personal benefits to our NEOs during the fiscal year ended December 31, 2024.

401(k) Plan

We currently maintain a tax-qualified 401(k) retirement savings plan for our employees, including our NEOs, who satisfy certain eligibility requirements. Our NEOs are eligible to participate in the 401(k) plan on the same terms as other
full-time employees. The 401(k) plan provides eligible employees with an opportunity to save for retirement on a tax advantaged basis. Eligible employees are able to defer eligible compensation subject to applicable annual limits of the Internal
Revenue Code of 1986, as amended (the “Code”). Our 401(k) plan is intended to be qualified under Section