Company: SION
Filing Date: 2025-01-17
Form Type: S-1
Source: 0001193125-25-008474
Chunk: 330

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-01-17
Form: S-1
Chunk 330
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As of December 31, 2023, the Company held commercial paper within cash and cash equivalents as it had a maturities of less than 90 days and no marketable securities were held as of December 31, 2023. As of December 31, 2022, all marketable securities had contractual maturities within one year and are considered short-term investments. The Company has determined that there were no material changes in the credit risk, therefore the Company has not recognized any credit allowances on its debt securities. F-15

4. Fair Value Measurements The following table presents information about the Company’s financial instruments that are measured at fair value on a recurring basis and indicates the fair value hierarchy of the inputs the Company utilized to determine such fair value (in thousands):

|                              |     | December 31, 2023 |        |     |         |        |     |         |        |     |         |   |
|:-----------------------------|:----|:------------------|-------:|:----|:--------|-------:|:----|:--------|-------:|:----|:--------|:--|
|                              |     | Total             |        |     | Level 1 |        |     | Level 2 |        |     | Level 3 |   |
| Assets                       |     |                   |        |     |         |        |     |         |        |     |         |   |
| Cash equivalents:            |     |                   |        |     |         |        |     |         |        |     |         |   |
| Money market funds           |     | $                 | 23,660 |     | $       | 23,660 |     | $       |      — |     | $       | — |
| Commercial paper             |     |                   |    989 |     |         |      — |     |         |    989 |     |         | — |
| Total financial assets       |     | $                 | 24,649 |     | $       | 23,660 |     | $       |    989 |     | $       | — |
|                              |     | December 31, 2022 |        |     |         |        |     |         |        |     |         |   |
|                              |     | Total             |        |     | Level 1 |        |     | Level 2 |        |     | Level 3 |   |
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