On October 21, 2025 RAPT Therapeutics, Inc. (Nasdaq: RAPT) ("RAPT"), a clinical-stage immunology-based biopharmaceutical company focused on discovering, developing and commercializing novel therapies for patients living with inflammatory and immunological diseases, reported that it has commenced an underwritten public offering of shares of its common stock. In addition, RAPT expects to grant the underwriters a 30-day option to purchase up to an additional 15% of the total number of shares of common stock RAPT is offering, at the public offering price, less underwriting discounts and commissions. All of the shares of common stock are being offered by RAPT. The proposed offering is subject to market conditions, and there can be no assurance as to whether or when the proposed offering may be completed or as to the actual size or terms of the proposed offering.

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Leerink Partners, TD Cowen, Guggenheim Securities, Wells Fargo Securities and LifeSci Capital are acting as joint bookrunning managers for the proposed offering. H.C. Wainwright & Co. and Clear Street are acting as lead managers for the proposed offering.

The offering is being made pursuant to a shelf registration statement, including a base prospectus, filed by RAPT with the Securities and Exchange Commission (the "SEC"), which was declared effective by the SEC on August 17, 2023. The offering may be made only by means of a prospectus supplement and accompanying prospectus. 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. When available, electronic copies of the preliminary prospectus supplement and the accompanying prospectus may also be obtained from: Leerink Partners LLC, Attention: Syndicate Department, 53 State Street, 40th Floor, Boston, MA 02109, by telephone at 1-800-808-7525 ex. 6132 or by email at [email protected]; TD Securities (USA) LLC, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717 or by email at [email protected]; 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 [email protected]; Wells Fargo Securities, LLC, Attention: Wells Fargo Securities, 90 South 7th Street, 5th Floor, Minneapolis, MN 55402, at 800-645-3751 (option #5) or email a request to [email protected]; or LifeSci Capital LLC at 1700 Broadway, 40th Floor, New York, New York 10019, or by email at [email protected].

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 offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such state or jurisdiction.

(Press release, RAPT Therapeutics, OCT 21, 2025, https://investors.rapt.com/news-releases/news-release-details/rapt-therapeutics-announces-proposed-public-offering-common-1 [SID1234656871])