Atossa Therapeutics Announces Registered Direct Offering of up to $16.5 Million in Gross Proceeds

About this update from Atossa Therapeutics, Inc.

$4.5 million upfront with up to an additional $12 million of potential aggregate gross proceeds upon exercise in full of warrants SEATTLE, June 11, 2026 /PRNewswire/ -- Atossa Therapeutics, Inc. (Nasdaq: ATOS) ("Atossa" or the "Company"), a clinical-stage biopharmaceutical company developing novel therapies in oncology and other areas of high unmet clinical need, today announced that it has entered into a securities purchase agreement with institutional investors for the purchase and sale of 1,363,638 shares (the "Shares") of its common stock, par value $0.18 per share ("Common Stock") (or common stock equivalents in lieu thereof), Series A warrants to purchase up to 1,363,638 shares of Common Stock and short-term Series B warrants to purchase up to 1,363,638 shares of Common Stock (such warrants, collectively, the "Series Warrants") and accompanying Series Warrants in a registered direct offering. The Series Warrants will be exercisable six months following the date of issuance. The Series A warrants will expire on the five one-half (5.5) year anniversary of the date of issuance. The short-term Series B warrants will expire on the two (2) year anniversary of the date of issuance. The closing of the offering is expected to occur on or about June 12, 2026, subject to the satisfaction of customary closing conditions. Rodman & Renshaw LLC is acting as the exclusive placement agent for the offering. The aggregate gross proceeds to the Company from the offering are expected to be approximately $4.5 million before deducting the placement agent's fees and other estimated offering expenses payable by the Company. The potential additional gross proceeds to the Company from the Series Warrants, if fully exercised on a cash basis, will be approximately $12 million. No assurance can be given that any of the Series Warrants will be exercised, or that the Company will receive cash proceeds from the exercise of the Series Warrants. The Company currently intends to use the net proceeds from the offering for clinical development of its product candidates, working capital and general corporate purposes. The securities described above are being offered and sold by the Company in a registered direct offering pursuant to a "shelf" registration statement on Form S-3 (File No. 333-279367) that was filed wi...

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