Sionna Therapeutics Announces Closing of $219.2 million Upsized Initial Public Offering, Including Full Exercise of Underwriters’ Option to Purchase Additional Shares

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Sionna Therapeutics, Inc.
Sionna Therapeutics, Inc.

BOSTON, Feb. 10, 2025 (GLOBE NEWSWIRE) -- Sionna Therapeutics, Inc. (Nasdaq: SION), a clinical-stage biopharmaceutical company on a mission to revolutionize the current treatment paradigm for cystic fibrosis (CF) by developing novel medicines that normalize the function of the cystic fibrosis transmembrane conductance regulator (CFTR) protein, today announced the closing of its upsized initial public offering of 12,176,467 shares of its common stock at a public offering price of $18.00 per share, which includes 1,588,234 shares issued upon the full exercise by the underwriters of their option to purchase additional shares of common stock in the offering. All of the shares of common stock were sold by Sionna.

The gross proceeds to Sionna from the initial public offering were, including full exercise of the underwriters’ option to purchase additional shares, approximately $219.2 million, before deducting underwriting discounts and commissions and offering expenses. The shares commenced trading on the Nasdaq Global Market on February 7, 2025 under the ticker symbol “SION.”

Goldman Sachs & Co. LLC, TD Cowen, Stifel, and Guggenheim Securities acted as joint book-running managers for the offering.

A registration statement relating to the shares sold in the initial public offering has been filed with the Securities and Exchange Commission and was declared effective by on February 6, 2025. This offering was made only by means of a prospectus. A copy of the final prospectus may be obtained from Goldman Sachs & Co. LLC, Attention: Prospectus Department, 200 West Street, New York, NY 10282, via telephone: (866) 471-2526, via fax: 212 902-9316, or via email: prospectus-ny@ny.email.gs.com; TD Securities (USA) LLC, 1 Vanderbilt Avenue, New York, NY 10017, by telephone at (855) 495-9846, or by email at TD.ECM_Prospectus@tdsecurities.com; Stifel, Nicolaus & Company, Incorporated, Attention: Syndicate, One Montgomery Street, Suite 3700, San Francisco, CA 94104, by telephone at (415) 364-2720, or by email at syndprospectus@stifel.com; and Guggenheim Securities, LLC, Attention: Equity Syndicate Department, 330 Madison Avenue, 8th Floor, New York, NY 10017, or by telephone at (212) 518-9544 or by email at GSEquityProspectusDelivery@guggenheimpartners.com.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.