Company: SION
Filing Date: 2025-02-07
Form Type: 424B4
Source: 0001193125-25-022709
Chunk: 357

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-07
Form: 424B4
Chunk 357
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963,963 |     |             |  3,963,963 |     | $              |  13,014 |     | $           |  13,200 |     |                |  2,712,998 |
| Series A Preferred Stock    |     |                   |  5,704,161 |     |             |  5,704,161 |     |                |  25,235 |     |             |  25,263 |     |                |  3,904,017 |
| Series B Preferred Stock    |     |                   | 11,370,621 |     |             | 11,370,621 |     |                | 110,791 |     |             | 111,000 |     |                |  7,782,230 |
| Total                       |     |                   | 21,038,745 |     |             | 21,038,745 |     | $              | 149,040 |     | $           | 149,463 |     |                | 14,399,245 |

The holders of Preferred Stock have rights, preferences and privileges which are disclosed within Note 10, “ Convertible Preferred Stock” in the audited consolidated annual financial statements for the years ended December 31, 2023 and 2022 included elsewhere in this prospectus. There have been no material changes to rights, preferences and privileges during the nine months ended September 30, 2024. Liquidation Preference The holders of the Preferred Stock have first preference in the event of any voluntary or involuntary liquidation, dissolution, or winding up of the Company, including a merger or sale of the Company. The amount to be paid is equal to greater of the Series C Preferred Stock original issue price in the case of the Series C Preferred Stock, Series B Preferred Stock original issue price in the case of the Series B Preferred Stock, the Series A Preferred Stock original issue price in the case of the Series A Preferred Stock, and the Series Seed Preferred Stock original issue price in the case of the Series Seed Preferred Stock, plus any dividends declared but unpaid thereon, or such amount per share as would have been payable had all shares of the Preferred Stock been converted into common stock. F-41

Conversion Each share of Preferred Stock shall be convertible, at the option of the holder (without payment) into common stock as determined by dividing the Preferred Stock’s original issue price by the conversion price in effect at the time of