Avalo Therapeutics Announces Proposed Public Offering of Common Stock and Pre-Funded Warrants

WAYNE, Pa., May 05, 2026 — Avalo Therapeutics, Inc. (NASDAQ: AVTX) (“Avalo”), a clinical-stage biotechnology company fully dedicated to developing IL-1β based treatments for immune-mediated inflammatory diseases, today announced that it has commenced an underwritten public offering of shares of its common stock and, in lieu of common stock to certain investors, pre-funded warrants to purchase shares of its common stock. All of the shares of common stock and pre-funded warrants to be sold in this offering are being offered by Avalo. In addition, Avalo intends to grant the underwriters a 30-day option to purchase up to an additional fifteen percent (15%) of shares of its common stock (and shares of common stock underlying pre-funded warrants) offered in the public offering on the same terms and conditions. The proposed 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.

Avalo intends to use the net proceeds from the offering, together with its existing cash, cash equivalents and short-term investments, to advance the clinical development of abdakibart, including through its Phase 3 topline data release, and for working capital and other general corporate purposes.

Leerink Partners, TD Cowen and BofA Securities are acting as joint bookrunning managers for the offering.

The securities described above are being offered pursuant to shelf registration statement on Form S-3 (No. 333-292614) that was filed with the U.S. Securities and Exchange Commission (the “SEC”) on January 8, 2026, and was declared effective on January 20, 2026. This offering is being made only by means of a prospectus supplement and an accompanying prospectus that form a part of the registration statement.

A preliminary prospectus supplement related to and describing the terms of the offering will be filed with the SEC and will be available on the SEC’s website located at www.sec.gov. Copies of the preliminary prospectus supplement and an accompanying prospectus related to the offering may also be obtained, when available, from Leerink Partners LLC, Syndicate Department, 53 State Street, 40th Floor, Boston, MA 02109, or by telephone at (800) 808-7525 ext. 6105, 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]; and BofA Securities, Attention: Prospectus Department, 201 North Tryon Street, NC1-022-02-25 Charlotte, NC 28255- 0001, or by email at [email protected].

This press release shall not constitute an offer to sell or a 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 that state or jurisdiction.

About Avalo Therapeutics

Avalo Therapeutics is a clinical stage biotechnology company fully dedicated to developing IL-1β-based treatments for immune-mediated inflammatory diseases. Our lead asset, abdakibart (AVTX-009), is an anti-IL-1β monoclonal antibody (mAb). Positive topline data was recently reported for abdakibart in a Phase 2 clinical trial in hidradenitis suppurativa (HS). We’re also exploring additional opportunities to make an impact in prevalent indications that have significant remaining unmet needs.

Investor & Media Contact

Christopher Sullivan, CFO Avalo Therapeutics, Inc. [email protected] 410-803-6793

Or

Meru Advisors Lauren Glaser [email protected]