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[Form 4] Sionna Therapeutics, Inc. Insider Trading Activity

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Sionna Therapeutics director Bruce Booth received a grant of 17,340 non-qualified stock options to buy common stock at $36.73 per share. The options expire on June 16, 2036 and vest in full on the earlier of June 17, 2027 or the next annual meeting, subject to his continued service. Any proceeds from future sales of shares issued upon exercise will be transferred to Atlas Venture Life Science Advisors, LLC, and Booth disclaims ownership except for any pecuniary interest.

Positive

  • None.

Negative

  • None.
Insider Booth Bruce
Role null
Type Security Shares Price Value
Grant/Award Non-Qualified Stock Option (right to buy) 17,340 $0.00 --
Holdings After Transaction: Non-Qualified Stock Option (right to buy) — 17,340 shares (Direct, null)
Footnotes (1)
  1. This option was granted to the Reporting Person, a director of the Issuer. The proceeds of any sale of shares of common stock issued to the Reporting Person upon exercise of this option will be transferred to Atlas Venture Life Science Advisors, LLC and as such, the Reporting Person disclaims ownership of such securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of his pecuniary interest therein, if any. This option vests in full upon the earlier of June 17, 2027 or the date of the next annual meeting of Sionna Therapeutics, Inc., subject to the Reporting Person's continued service on such vesting date.
Option grant size 17,340 options Non-qualified stock options granted to director
Exercise price $36.73 per share Conversion or exercise price of granted options
Expiration date June 16, 2036 Option term end date
Underlying shares 17,340 shares Common stock underlying the option grant
Post-transaction derivative holdings 17,340 options Total derivative securities following the grant
Transaction code A Grant, award, or other acquisition under Section 16
Non-Qualified Stock Option (right to buy) financial
"security_title: "Non-Qualified Stock Option (right to buy)""
Section 16 of the Securities Exchange Act of 1934 regulatory
"disclaims ownership of such securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934"
A provision of federal securities law that requires company insiders—directors, officers and large shareholders—to publicly report their stock holdings and trades and to surrender any “short-swing” profits from purchases and sales within a six-month window. It acts like a rule that forces leaders to announce their trades and prevents quick buy-sell windfalls, giving investors transparency into insider activity and reducing opportunities for unfair gain.
pecuniary interest financial
"except to the extent of his pecuniary interest therein, if any"
annual meeting financial
"vests in full upon the earlier of June 17, 2027 or the date of the next annual meeting of Sionna Therapeutics, Inc."
A company's annual meeting is a yearly gathering where owners (shareholders) and the board review performance, ask questions, and vote on key matters like electing directors, approving auditor choices, and sometimes setting pay or dividend policies. For investors it matters because decisions made and votes cast can change who runs the company, influence strategy and payouts, and affect the value or direction of their investment—similar to a homeowners’ meeting where rules and leaders that shape your property’s value are decided.
vesting financial
"This option vests in full upon the earlier of June 17, 2027 or the date of the next annual meeting"
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
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Learn about SEC filing dates
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Booth Bruce

(Last)(First)(Middle)
C/O SIONNA THERAPEUTICS, INC.
21 HICKORY DRIVE, SUITE 500

(Street)
WALTHAM MASSACHUSETTS 02451

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Sionna Therapeutics, Inc. [ SION ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/17/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Non-Qualified Stock Option (right to buy)(1)$36.7306/17/2026A17,340 (2)06/16/2036Common Stock17,340$0.017,340D
Explanation of Responses:
1. This option was granted to the Reporting Person, a director of the Issuer. The proceeds of any sale of shares of common stock issued to the Reporting Person upon exercise of this option will be transferred to Atlas Venture Life Science Advisors, LLC and as such, the Reporting Person disclaims ownership of such securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of his pecuniary interest therein, if any.
2. This option vests in full upon the earlier of June 17, 2027 or the date of the next annual meeting of Sionna Therapeutics, Inc., subject to the Reporting Person's continued service on such vesting date.
By: Ommer Chohan, Attorney-in-Fact For: Bruce Booth06/18/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Sionna Therapeutics (SION) report for Bruce Booth?

Sionna Therapeutics reported a stock option grant to director Bruce Booth. He received 17,340 non-qualified stock options to purchase common stock at $36.73 per share, providing equity-based compensation tied to the company’s future share performance rather than a cash payment today.

What are the key terms of Bruce Booth’s Sionna Therapeutics (SION) option grant?

Bruce Booth’s option grant covers 17,340 shares at a $36.73 exercise price. The non-qualified stock options expire on June 16, 2036 and relate to common stock, giving him the right, but not the obligation, to buy shares at that fixed price once vested.

When do Bruce Booth’s Sionna Therapeutics (SION) options vest?

The options vest in full on the earlier of two dates. Vesting occurs on June 17, 2027 or on the date of the next annual meeting of Sionna Therapeutics, whichever comes first, provided Booth continues to serve as a director through the applicable vesting date.

How long do Bruce Booth’s Sionna Therapeutics (SION) options remain exercisable?

The granted options remain exercisable until June 16, 2036. After that expiration date, any unexercised options will lapse. This long-term duration is typical for director equity awards, aligning potential value with the company’s performance over many years.

Who benefits from any sale of shares from Bruce Booth’s Sionna Therapeutics (SION) options?

Proceeds from any future sale of shares issued on exercise go to Atlas Venture Life Science Advisors, LLC. Booth disclaims ownership of these securities for Section 16 purposes, except for any pecuniary interest he might have, clarifying the economic beneficiary structure.

Does this Sionna Therapeutics (SION) Form 4 show Bruce Booth buying or selling shares on the market?

The Form 4 reports a grant of stock options, not an open-market trade. It records an award of 17,340 non-qualified stock options with a $36.73 exercise price, rather than a current purchase or sale of common stock in the market.