Yarrow Bioscience Announces Proposed Underwritten Public Offering
Yarrow Bioscience, Inc. (“Yarrow” or the “Company”) (Nasdaq: YARW), a clinical-stage biotechnology company focused on developing transformative therapies for autoimmune thyroid diseases, today announced that it has commenced an underwritten public offering of shares of its common stock or, in lieu of common stock to certain investors that so choose, pre-funded warrants to purchase shares of its common stock. In addition, Yarrow expects to grant the underwriters a 30-day option to purchase up to an additional 15% of shares of common stock at the public offering price, less underwriting discounts and commissions. The proposed public offering is subject to market and other conditions, and there can be no assurance as to whether or when the offering may be completed or as to the actual size or terms of the offering. All of the securities are being offered by Yarrow.
Yarrow intends to use the net proceeds from this offering to fund research and development expenses for Yarrow’s pipeline and general corporate purposes, which may include working capital, capital expenditures and other general corporate purposes.
Jefferies, TD Cowen and Guggenheim Securities are acting as joint book-running managers and LifeSci Capital is acting as lead manager for the proposed offering.
A shelf registration statement on Form S-3 relating to these securities was filed with the Securities and Exchange Commission (“SEC”) and was declared effective on August 19, 2026. This offering will be 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 will be filed with the SEC and will be available on the SEC’s website, located at www.sec.gov. A copy of the preliminary prospectus supplement and the accompanying prospectus relating to the offering may be obtained, when available, 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 Prospectus_Department@Jefferies.com; TD Securities (USA) LLC, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, or by email at TDManualrequest@broadridge.com; Guggenheim Securities, LLC, Attention: Equity Syndicate Department, 330 Madison Avenue, 8th Floor, New York, NY 10017, by telephone at (212) 518-9544, or by email at GSEquityProspectusDelivery@guggenheimsecurities.com; or LifeSci Capital LLC, Attention: LifeSci Capital LLC, 1700 Broadway, 40th Floor, New York, New York 10019, or by email at legalnotices@lifescicapital.com.

