Company: SION
Filing Date: 2025-02-07
Form Type: 424B4
Source: 0001193125-25-022709
Chunk: 310

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-07
Form: 424B4
Chunk 310
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. We have agreed to reimburse the underwriters for certain of their expenses in an amount up to $40,000.

The company has agreed to indemnify
the several underwriters against certain liabilities, including liabilities under the Securities Act.

The underwriters and their respective
affiliates are full service financial institutions engaged in various activities, which may include sales and trading, commercial and investment banking, advisory,

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investment management, investment research, principal investment, hedging, market making, brokerage and other financial and non-financialactivities and services. Certain of the underwriters and their respective affiliates have provided, and may in the future provide, a variety of these services to the issuer and to persons and entities with relationships with the issuer, for which they received or will receive customary fees and expenses. In the ordinary course of their various business activities, the underwriters and their respective affiliates, officers, directors and employees may purchase, sell or hold a broad array of investments and actively trade securities, derivatives, loans, commodities, currencies, credit default swaps and other financial instruments for their own account and for the accounts of their customers, and such investment and trading activities may involve or relate to assets, securities and/or instruments of the issuer (directly, as collateral securing other obligations or otherwise) and/or persons and entities with relationships with the issuer. The underwriters and their respective affiliates may also communicate independent investment recommendations, market color or trading ideas and/or publish or express independent research views in respect of such assets, securities or instruments and may at any time hold, or recommend to clients that they should acquire, long and/or short positions in such assets, securities and instruments. Selling Restrictions European Economic Area In relation to each Member State of the European Economic Area (each, a “Relevant Member”), no shares have been offered or will be offered pursuant to the offering to the public in that Relevant Member prior to the publication of a prospectus in relation to the shares which has been approved by the competent authority in that Relevant Member or, where appropriate, approved in another Relevant Member and notified to the competent authority in that Relevant Member, all in accordance with the Prospectus Regulation, except that the shares may be offered to the public in that Relevant Member at any time:

| (i) | to any legal entity which is a qualified investor as defined under Article 2 of the Prospectus Regulation; |

| (ii) | to fewer than 150 natural or legal persons (other than qualified investors as defined under Article 2 of the Prospectus 
 Regulation), subject