Company: SION
Filing Date: 2025-04-29
Form Type: DEF 14A
Source: 0001193125-25-101830
Chunk: 20

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-04-29
Form: DEF 14A
Chunk 20
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 Meeting and will have an opportunity to make a statement if he or she desires to do so and to respond to appropriate questions from our stockholders. Principal Accountant Fees and Services We incurred the following fees from Deloitte & Touche LLP for the audit of the consolidated financial statements and for other services related to the fiscal years ended December 31, 2024 and December 31, 2023.

| Fee Category          |     | Fiscal Year 
 2024 ($)    |           |     | Fiscal Year 
 2023 ($)    |         |
|:----------------------|:----|:------------|----------:|:----|:------------|--------:|
| Audit Fees(1)         |     | $           | 1,023,583 |     | $           | 248,000 |
| Audit-Related Fees(2) |     |             |           |     |             |       — |
| Tax Fees(3)           |     |             |         — |     |             |       — |
| All Other Fees        |     |             |         — |     |             |       — |
| Total Fees            |     | $           | 1,023,583 |     | $           | 248,000 |

| (1) | Audit Fees consist of fees for the audit of our annual financial statements and fees related to our initial public offering, including comfort letters and consents. |

| (2) | Audit-Related Fees consist of fees billed for other assurance and related services rendered during the respective year. |

| (3) | Tax Fees consist of fees for tax compliance, advice and tax services. |

**Audit Committee Pre-approval Policy and Procedures Our audit committee has adopted policies and procedures relating to the approval of all audit and non-auditservices that are to be performed by our independent registered public accounting firm. This policy provides that we will not engage our independent registered public accounting firm to render audit or non-auditservices unless the service is specifically approved in advance by our audit committee or the engagement is entered into pursuant to the pre-approvalprocedure described below. From time to time, our audit committee may pre-approvespecified types of services that are expected to be provided to us by our independent registered public accounting firm during the next 12 months. Any such pre-approval details the particular service or type of services to be provided and is also generally subject to a maximum dollar amount. 13

During the fiscal years ended 2024 and 202