Atossa Therapeutics to Provide Business Update and Report Second Quarter 2023 Financial Results on August 14, 2023

Atossa Therapeutics, Inc. (Nasdaq: ATOS), a clinical stage biopharmaceutical company developing innovative medicines to address significant unmet needs in cancer, today announced that it will provide a business update and report financial results for the second quarter 2023 on Monday, August 14, 2023. Company management will host a conference call to review the results at 9:00 a.m. ET / 6:00 a.m. PT on August 14, 2023.

Second Quarter 2023 Conference Call DetailsDate: Monday, August 14, 2023Time: 9:00 a.m. ET / 6:00 a.m. PTParticipant Registration: https://edge.media-server.com/mmc/p/2qtrmqz3

Interested participants should register for the conference call in advance of the call’s start time.

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

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 focus on breast cancer. For more information, please visit www.atossatherapeutics.com.

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

FORWARD LOOKING STATEMENTS Forward-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 the expected timing of releasing data, 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, anticipated progress on Atossa’s (Z)-endoxifen development program, 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, anticipated working capital needs and expectations around the sufficiency of our cash reserves, 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.