Cabaletta Bio (CABA) Announces Proposed Share Offering

Cabaletta Bio, Inc. (“Cabaletta” or the “Company”) (Nasdaq: CABA), a clinical-stage biotechnology company focused on developing and launching the first curative targeted cell therapies designed specifically for patients with autoimmune diseases, announced that it has commenced an underwritten public offering of shares of its common stock and accompanying warrants to purchase shares of its common stock (or pre-funded warrants in lieu thereof) and, in lieu of common stock, to certain investors, pre-funded warrants to purchase shares of its common stock and accompanying warrants to purchase shares of its common stock (or pre-funded warrants in lieu thereof). Cabaletta also intends to grant the underwriters a 30-day option to purchase up to an additional fifteen percent (15%) of the shares of common stock and warrants offered in the public offering. All of the shares, pre-funded warrants and accompanying common stock warrants to be sold in the proposed offering are to be sold by Cabaletta.

Jefferies, TD Cowen and Cantor are acting as joint book-running managers for the proposed offering. The 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.

The offering is expected to close on or about June 12, 2025, subject to customary closing conditions.

The shares of common stock, pre-funded warrants, common stock warrants and shares of common stock issuable upon the exercise of the pre-funded warrants and common stock warrants are being offered by Cabaletta pursuant to a shelf registration statement on Form S-3 (File No. 333-278126), as amended by that certain Post-Effective Amendment No. 1 to Form S-3 (No. 333-278126) and that certain Post-Effective Amendment No. 2 to Form S-3 (No. 333-278126), as filed with the U.S. Securities and Exchange Commission (SEC) on March 31, 2025 and declared effective on March 31, 2025. A preliminary prospectus supplement and accompanying prospectus relating to and describing the terms of the offering will be filed with the SEC and may also be obtained, when available, from: Jefferies LLC by mail at Attn: 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, by mail at 1 Vanderbilt Avenue, New York, NY 10017, by telephone at (833) 297-2926 or by email at [email protected]; Cantor Fitzgerald & Co. by mail at Attention: Capital Markets, 110 East 59th Street, New York 10022 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 registration or qualification under the securities laws of any such state or jurisdiction.

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