Atossa to Present at the Sidoti Small-Cap Virtual Conference

Atossa Therapeutics, Inc. (Nasdaq: ATOS), a clinical stage biopharmaceutical company developing innovative proprietary medicines to address significant unmet needs in cancer, today announced that the Company will present at the Sidoti Small-Cap Virtual Conference being held March 22-23, 2023. The presentation by Dr. Steven Quay, President and Chief Executive Officer and Kyle Guse, General Counsel and Chief Financial Officer, will take place on Thursday, March 23 at 1:00 pm eastern time.

To register and view a live webcast of the presentation, please visit the event's website at: https://sidoti.zoom.us/webinar/register/WN_Eeu2shzgQoOEjAkhs9zcng

Following the conference, a recording of the webcast will be made available on the investor relations page of Atossa’s website: https://atossatherapeutics.com/investors

ABOUT ATOSSA THERAPEUTICSAtossa Therapeutics, Inc. is a clinical-stage biopharmaceutical company developing innovative medicines in areas of significant unmet medical need in oncology with a current focus on breast cancer. For more information, please visit www.atossatherapeutics.com

CONTACTS:Kyle GuseGeneral Counsel and Chief Financial [e-mail]

Eric Van ZantenVP, Investor and Public [e-mail]

FORWARD LOOKING STATEMENTSForward-looking statements in this press release, which Atossa undertakes no obligation to update, are subject to risks and uncertainties that may cause actual results to differ materially from the anticipated or estimated future results, including the risks and uncertainties associated with any variation between interim and final clinical results, actions and inactions by the FDA, the outcome or timing of regulatory approvals needed by Atossa including those needed to commence studies of (Z)-endoxifen, lower than anticipated rate of patient enrollment, estimated market size of drugs under development, the safety and efficacy of Atossa’s products, performance of clinical research organizations and investigators, obstacles resulting from proprietary rights held by others such as patent rights, whether reduction in breast density or in Ki-67 or any other result from a neoadjuvant study is an approvable endpoint for (Z)-endoxifen, whether Atossa can complete acquisitions, and other risks detailed from time to time in Atossa’s filings with the Securities and Exchange Commission, including without limitation its periodic reports on Form 10-K and 10-Q, each as amended and supplemented from time to time.