ATOSSA THERAPEUTICS, INC. 8-KCurrent Reports (8-K / ad hoc)

Changes / Accountants

Item 9.01. Financial Statements and Exhibits. (d) Exhibits Exhibit No. Description 99.1 Corporate Presentation Dated September 18, 2026 104 Cover page Interactive Data File (embedded within the Inline XBRL document) * * * SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Atossa Therapeutics, Inc. Date: September 18, 2026 By: /s/ Mark J. Daniel Mark J. Daniel Chief Financial Officer (Principal Financial and Accounting Officer)