Atossa Therapeutics Announces Closing of 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 12, 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 the closing of its previously announced registered direct offering of 1,363,637 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 1,363,637 shares of Common Stock and short-term Series B warrants to purchase up to 1,363,637 shares of Common Stock (such warrants, collectively, the "Series Warrants") and accompanying Series Warrants. The Series Warrants are exercisable six months following the date of issuance. The Series A warrants expire on the five and one-half (5.5) year anniversary of the date of issuance. The short-term Series B warrants expire on the two (2) year anniversary of the date of issuance. Rodman & Renshaw LLC acted as the exclusive placement agent for the offering. The aggregate gross proceeds to the Company from the offering were 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 were 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 with the Securities and Exchange Commission (the "SEC"), on May 13, 2024, and declared effective by the SEC on May 23, 2024. The securities offered in the registered direct offering were offered only by means of a prospectus, including a p...

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