Company: SION
Filing Date: 2025-01-17
Form Type: S-1
Source: 0001193125-25-008474
Chunk: 338

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-01-17
Form: S-1
Chunk 338
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 the holders of Preferred Stock. All shares of Preferred Stock will automatically convert into shares of common stock upon a qualified initial public offering on a one-to-onebasis. 11. Common Stock The Company was authorized to issue 30,000,000 of common stock as of December 31, 2023 and 2022, respectively. As of December 31, 2023 and 2022, there were 4,840,670 and 4,788,720 shares, legally issued and outstanding, which includes 383,031 and 707,953 shares of unvested restricted stock. As of December 31, 2023 and 2022, there were 4,457,639 and 4,080,767 shares of common stock outstanding for accounting purposes as reported on the consolidated statement of convertible preferred stock and stockholders’ deficit. This excludes unvested restricted stock which are legally outstanding but are not considered outstanding for accounting purposes. The voting, dividend and liquidation rights of the holders of the Company’s common stock are subject to and qualified by the rights, powers and preference of the holders of the Preferred Stock set forth in Note 10 above. The number of shares of common stock that have been reserved for the potential conversion of Preferred Stock, exercise of stock options, and vesting of restricted stock is as follows:

|                                  |     | Year Ended December 31, |       2023 |     |     |       2022 |
|:---------------------------------|:----|:------------------------|-----------:|:----|:----|-----------:|
| Convertible preferred stock      |     |                         | 21,038,745 |     |     | 21,038,745 |
| Options to purchase common stock |     |                         |  2,797,110 |     |     |  2,842,147 |
| Unvested restricted stock        |     |                         |    383,031 |     |     |    707,953 |
| Total                            |     |                         | 24,218,886 |     |     | 24,588,845 |

12. Stock-Based Compensation 2020 Stock Option and Grant Plan The Company’s 2020 Stock Option and Grant Plan, as amended (the “2020 Plan”), provides for the Company to sell or issue common stock or restricted common stock, or to grant incentive stock options or nonqualified stock options for the purchase of common stock, to employees, members of the Board