Company: SION
Filing Date: 2025-01-17
Form Type: S-1
Source: 0001193125-25-008474
Chunk: 346

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-01-17
Form: S-1
Chunk 346
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     |        |       — |     |                 |          — |     |        |       — |     |              |         — |     |        | — |     |            |  2,644 |     |               |   — |     |             | —        |   |     |               |    2,644 |   |
| Unrealized gain on marketable securities                            |     |                 |         — |     |        |      — |     |                 |         — |     |        |      — |     |                 |          — |     |        |       — |     |                 |          — |     |        |       — |     |              |         — |     |        | — |     |            |      — |     |               | 773 |     |             | —        |   |     |               |      773 |   |
| Net loss                                                            |     |                 |         — |     |        |      — |     |                 |         — |     |        |      — |     |                 |          — |     |        |       — |     |                 |          — |     |        |       — |     |              |         — |     |        | — |     |            |      — |     |               |   — |     |             | (45,840  | ) |     |               |  (45,840 | ) |
| Balance as of September 30, 2024                                    |     |                 | 3,963,963 |     | $      | 13,014 |     |                 | 5,704,161 |     | $      | 25,235 |     |                 | 11,370,621 |     | $      | 110,791 |     |                 | 18,628,970 |     | $      | 181,328 |     |              | 6,814,049 |     | $      | 5 |     | $          | 15,911 |     | $             | 773 |     | $           | (165,238 | ) |     | $             | (148,549 | ) |

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements. F-32

SIONNA THERAPEUTICS, INC. CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ DEFICIT (in thousands