Company: SION
Filing Date: 2025-02-03
Form Type: S-1/A
Source: 0001193125-25-018825
Chunk: 266

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-03
Form: S-1/A
Chunk 266
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 unless the option (i) is granted pursuant to a transaction described in, and
in a manner consistent with Section 424(a) of the Code, (ii) is granted to an individual who is not subject to U.S. income tax or (iii) if the grant is otherwise exempt or compliant with Section 409A of the Code. The term of each
option will be fixed by our administrator and may not exceed 10 years from the date of grant (or five years in the case of certain incentive stock options). Our administrator will determine at what time or times each option may be exercised.

Our administrator may award stock appreciation rights under the 2025 Plan subject to such conditions and restrictions as it may determine. Stock
appreciation rights entitle the recipient to shares of common stock, or cash, equal to the value of the appreciation in our stock price over the exercise price. The exercise price of each stock appreciation right generally may not be less than 100%
of the closing price of our common stock on the date of grant (or, if no closing price is reported on that date, the closing price on the immediately preceding date on which a closing price was reported) unless the share appreciation right
(i) is granted pursuant to a transaction described in, and in a manner consistent with Section 424(a) of the Code, (ii) is granted to an individual who is not subject to U.S. income tax or (iii) if the grant is otherwise exempt
or compliant with Section 409A of the Code. The term of each stock appreciation right will be fixed by our administrator and may not exceed ten years from the date of grant. Our administrator will determine at what time or times each stock
appreciation right may be exercised.

Our administrator may award restricted shares of common stock and restricted stock units to participants
subject to such conditions and restrictions as our administrator may determine. These conditions and restrictions may include the achievement of certain performance goals and/or continued employment with us through a specified vesting period. Our
administrator may also grant shares of common stock that are free from any restrictions under the 2025 Plan. Unrestricted stock may be granted to participants in recognition of past services or for other valid consideration and may be issued in lieu
of cash compensation due to such participant.

Our administrator may grant dividend equivalent rights to participants that entitle the recipient to
receive credits for dividends that would be paid if the recipient had held a specified number of shares of common stock.

Our administrator may
grant cash-based awards