Company: SION
Filing Date: 2025-02-07
Form Type: 424B4
Source: 0001193125-25-022709
Chunk: 339

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-02-07
Form: 424B4
Chunk 339
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 The Company shall not declare, pay or set aside any dividends on shares of any other class or series of capital stock unless the Preferred Stockholders then outstanding first receive the dividend amounts calculated based upon the dividend on the class or series of capital stock that would result in the highest Preferred Stock dividend. 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 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. Redemption The Preferred Stock does not have redemption rights, except for the contingent redemption upon the occurrence of a liquidation event, which would constitute a merger or consolidation, or the sale, lease, transfer, exclusive license or other disposition, of all or substantially all of the Company’s or its subsidiaries’ assets. F-22

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 conversion. The Series B Preferred Stock conversion price shall initially be equal to $9.762, the Series A Preferred Stock conversion price shall initially be equal to $4.4289, and the Series Seed Preferred Stock conversion price shall initially be equal to $3.33. In the event of a liquidation, dissolution or winding up of the Company or a Deemed Liquidation Event, the conversion right shall terminate at the close of business on the last full day preceding the date fixed for the payment of any such amounts distributable on such event to 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 3,313,012 and 3,277,460 shares