Company: SION
Filing Date: 2025-02-03
Form Type: S-1/A
Source: 0001193125-25-018825
Chunk: 262

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-03
Form: S-1/A
Chunk 262
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 of the exercise price of an option, which may include cash, shares or certain other property or other consideration acceptable to the plan administrator. After a participant’s termination of service, the participant generally may exercise his or her options, to the extent vested as of such date of termination, for 90 days after termination. If termination is due to death or disability, the option generally will remain exercisable, to the extent vested as of such date of termination, for twelve months after such termination. However, in no event may an option be exercised later than the expiration of its term. If termination is for cause, then an option automatically expires upon the date of the optionee’s termination. The 2020 Plan permits the grant of restricted shares of common stock. Restricted stock awards are grants of shares of our common stock that are subject to various restrictions, including restrictions 188

on transferability and forfeitures provisions. Shares of restricted stock will vest, and the restrictions on such shares will lapse, in accordance with terms and conditions established by the
plan administrator.

The 2020 Plan permits the grant of unrestricted shares of common stock. Unrestricted stock awards may have been 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.

The 2020 Plan permits the grant of restricted stock units. A restricted stock unit is an unfunded and unsecured promise, denominated in shares, to
deliver shares or cash measured by the value of shares in the future, subject to the satisfaction of specified vesting requirements. After settlement, the plan administrator issues the underlying shares or the cash equivalent of the number of
shares, or a combination of both. The plan administrator determines the terms and conditions of restricted stock units, including the number of units granted, the vesting criteria (which may include accomplishing specified performance criteria or
continued service to us) and the form and timing of payment.

Our 2020 Plan generally does not allow for the transfer or assignment of awards, other
than, at the discretion of the plan administrator with respect to non-qualified stock options, by gift to an immediate family member, to trusts for the benefit of family members, or to partnerships in which
such family members are the only partners, and only the recipient of an award may exercise such an award during his or her lifetime. Our 2020 Plan also provides for drag along rights pursuant to which participants may be obligated to, on the request
of the majority of our shareholders, sell