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Dianthus Therapeutics, Inc. Announces Pricing of Upsized $251 Million Underwritten Public Offering

NEW YORK and WALTHAM, Mass., Sept. 09, 2025 (GLOBE NEWSWIRE) -- Dianthus Therapeutics, Inc. (Nasdaq: DNTH), a clinical-stage biotechnology company dedicated to advancing the next generation of antibody complement therapeutics to treat severe autoimmune diseases (鈥淒ianthus鈥� or the 鈥淐ompany鈥�), today announced the pricing of its previously announced upsized underwritten public offering of 6,487,879 shares of its common stock at a public offering price per share of $33.00 and, in lieu of common stock to certain investors, pre-funded warrants to purchase up to 1,112,121 shares of its common stock at a public offering price of $32.999 per pre-funded warrant. The pre-funded warrants have an exercise price of $0.001 per share and are exercisable immediately. The aggregate gross proceeds to Dianthus from the offering are expected to be approximately $251 million before deducting underwriting discounts and commissions and other offering expenses payable by Dianthus, excluding any exercise of the underwriters鈥� option to purchase additional shares. The offering is expected to close on September 11, 2025, subject to the satisfaction of customary closing conditions. In addition, Dianthus has granted the underwriters a 30-day option to purchase up to an additional 1,140,000 shares of its common stock at the public offering price, less underwriting discounts and commissions. All of the securities are being offered by Dianthus.

Dianthus intends to use the net proceeds from this offering to advance the Company鈥檚 preclinical and clinical development activities, as well as for working capital and general corporate purposes.

Jefferies, TD Cowen, Evercore ISI and Stifel are acting as joint book-running managers for the offering. LifeSci Capital is also acting as lead manager for the offering.

A shelf registration statement relating to these securities was filed with the Securities and Exchange Commission (鈥淪EC鈥�) and became effective on October 9, 2024. This offering is being made only by means of a written prospectus, including a prospectus supplement, forming a part of an effective registration statement. A preliminary prospectus supplement and accompanying prospectus relating to the offering have been filed with the SEC and are available on the SEC鈥檚 website, located at www.sec.gov. A copy of the final prospectus supplement and the accompanying prospectus relating to the offering will be filed with the SEC and will be available on the SEC鈥檚 website, located at www.sec.gov, and, when available, may be obtained from: Jefferies LLC, Attention: Equity Syndicate Prospectus Department, 520 Madison Avenue, New York, NY 10022, by telephone at (877) 821-7388, or by email at [email protected]; TD Securities (USA) LLC, 1 Vanderbilt Avenue, New York, NY 10017, by telephone at (855) 495-9846, or by email at [email protected]; Evercore Group L.L.C., Attention: Equity Capital Markets, 55 East 52nd Street, 35th Floor, New York, NY 10055, by telephone at (888) 474-0200, or by email at [email protected]; or 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 [email protected].

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

About Dianthus Therapeutics

Dianthus Therapeutics is a clinical-stage biotechnology company dedicated to designing and delivering novel, best-in-class monoclonal antibodies with improved selectivity and potency. Based in New York City and Waltham, Mass., Dianthus is comprised of an experienced team of biotech and pharma executives who are leading the development of next-generation antibody complement therapeutics, aiming to deliver transformative medicines for people living with severe autoimmune and inflammatory diseases.

Cautionary Statement Regarding Forward-Looking Statements

Certain statements in this press release, other than purely historical information, may constitute 鈥渇orward-looking statements鈥� within the meaning of the federal securities laws, including for purposes of the safe harbor provisions under the United States Private Securities Litigation Reform Act of 1995, express or implied statements regarding Dianthus鈥� expectations regarding the consummation of the offering, the satisfaction of customary closing conditions with respect to the offering and the potential value and clinical benefit of the Company鈥檚 product candidates. The words 鈥渙pportunity,鈥� 鈥減otential,鈥� 鈥渕ilestones,鈥� 鈥渞unway,鈥� 鈥渨ill,鈥� 鈥渁nticipate,鈥� 鈥渁chieve,鈥� 鈥渘ear-term,鈥� 鈥渃atalysts,鈥� 鈥減ursue,鈥� 鈥減ipeline,鈥� 鈥渂elieve,鈥� 鈥渃ontinue,鈥� 鈥渃ould,鈥� 鈥渆stimate,鈥� 鈥渆xpect,鈥� 鈥渋ntend,鈥� 鈥渕ay,鈥� 鈥渕ight,鈥� 鈥減lan,鈥� 鈥減ossible,鈥� 鈥減redict,鈥� 鈥減roject,鈥� 鈥渟hould,鈥� 鈥渟trive,鈥� 鈥渨ould,鈥� 鈥渁im,鈥� 鈥渢arget,鈥� 鈥渃ommit,鈥� and similar expressions (including the negatives of these terms or variations of them) generally identify forward-looking statements, but the absence of these words does not mean that statement is not forward looking.

Actual results could differ materially from those included in the forward-looking statements due to various factors, risks and uncertainties, including, but not limited to, that preclinical testing of claseprubart and data from clinical trials may not be predictive of the results or success of ongoing or later clinical trials, that the development of claseprubart or the Company's other compounds may take longer and/or cost more than planned, that the Company may be unable to successfully complete the clinical development of the Company鈥檚 compounds, that the Company may be delayed in initiating, enrolling or completing its planned clinical trials, and that the Company's compounds may not receive regulatory approval or become commercially successful products. These and other risks and uncertainties are identified under the heading "Risk Factors" included in the Company鈥檚 Annual Report on Form 10-K for the period ended December 31, 2024, and other filings that the Company has made and may make with the SEC in the future. Nothing in this press release should be regarded as a representation by any person that the forward-looking statements set forth herein will be achieved or that any of the contemplated results of such forward-looking statements will be achieved.

The forward-looking statements in this press release speak only as of the date they are made and are qualified in their entirety by reference to the cautionary statements herein. Dianthus undertakes no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise, except as required by law.

Contact
Jennifer Davis Ruff
Dianthus Therapeutics
[email protected]