Company: SION
Filing Date: 2025-08-11
Form Type: 10-Q
Source: 0002036042-25-000047
Chunk: 290

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-08-11
Form: 10-Q
Item: Part II, Item 1A
Chunk 290
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ifel, Nicolaus & Company, Incorporated, and Guggenheim Securities, LLC acted as representatives of the underwriters for the offering. We raised aggregate net proceeds of $199.6 million, after deducting underwriter discounts, commissions and other offering expenses.

We are holding a significant portion of the balance of the net proceeds in money market funds. There has been no material change in the planned use of the net proceeds from our IPO, as described in our final prospectus filed with the SEC on February 7, 2025 pursuant to Rule 424(b) under the Securities Act.

(c)    None.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

(a)    None.

(b)    None.

(c)    The following table describes, for the three months ended June 30, 2025, each trading arrangement under which any of our directors or executive officers adopted, modified, or terminated any contract, instruction or written plan for the purchase or sale of our securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any "non-Rule 10b5-1 trading arrangements" as defined in Item 408(c) of Regulation S-K.

84

Name (Title)Action Taken (Date of Action)Type of Trading ArrangementNature of Trading ArrangementExpiration Date of Trading Arrangement (1)Aggregate Number of SecuritiesMichael Cloonan (President and Chief Executive Officer)Adoption (May 21, 2025)Rule 10b5-1 trading arrangementSaleAugust 17, 2026Up to 200,000Elena Ridloff (Chief Financial Officer and Head of Corporate Development)Adoption  (May 20, 2025)Rule 10b5-1 trading arrangementSaleAugust 6, 2026Up to 85,000Jennifer Fitzpatrick (Chief Legal Officer)Adoption  (June 5, 2025)Rule 10b5-1 trading arrangementSaleSeptember 15, 2026Up to 41,000(1)     A trading arrangement may expire on an earlier date if all contemplated transactions are completed before such trading arrangement's expiration date, upon termination by broker or the holder of the trading arrangement, or as otherwise provided in the trading arrangement.

85

Item 6. Exhibits

(a)Exhibits.

ExhibitNumberDescription