Company: SION
Filing Date: 2025-02-07
Form Type: 424B4
Source: 0001193125-25-022709
Chunk: 331

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-07
Form: 424B4
Chunk 331
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 different effective dates for public and private
companies until the earlier of the date that it (i) is no longer an emerging growth company or (ii) affirmatively and irrevocably opts out of the extended transition period provided in the JOBS Act. As a result, these consolidated
financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates.

Recently Adopted Accounting Pronouncements

In June
2016, the FASB issued Accounting Standards Update (“ASU”) 2016-13, Financial Instruments—Credit Losses (Topic 326: Measurement of Credit Losses on Financial Instruments)(“ASU 2016-13”). The standard requires that credit losses be reported using an expected losses model rather than the incurred losses model that is currently used, and establishes additional disclosures related to
credit risks. For available-for-sale debt securities with unrealized losses, this standard requires allowances to be recorded instead of reducing the amortized cost of
the investment. The Company adopted this guidance effective January 1, 2023. The adoption of this standard did not have a material impact on the Company’s consolidated financial position and results of operations.

F-14

Recently Issued Accounting Pronouncements Not Yet Adopted In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280: Improvements to Reportable Segment Disclosures)(“ASU 2023-07”).The amendments in this update improve reportable segment disclosure requirements through enhanced disclosures about significant segment expenses. All disclosure requirements of the update are required for entities with a single reportable segment. The amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, and should be applied on a retrospective basis to all periods presented. For purposes of its annual reporting requirements, the Company has adopted this standard as of January 1, 2024. As of December 31, 2023, the Company only has one reportable segment. The Company is currently in the process of evaluating the effects of this pronouncement on the related disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740: Improvements to Income Tax Disclosures)(“ASU 2023-09”).ASU 2023-09provides more transparency about income tax information through improvements to income tax disclosures