Stock Taper
| DATE | TYPE | RATIO |
|---|---|---|
| 2026-02-02 | Reverse | 1:15 |
| 2018-04-20 | Reverse | 1:12 |
| 2016-08-26 | Reverse | 1:15 |
Atossa Therapeutics, Inc., a Seattle-based clinical-stage biopharmaceutical company founded in 2008, develops treatments for women's cancers, including Phase II oral (Z)-endoxifen for breast cancer, and explores immunotherapy programs.

Atossa's lead clinical-stage oral drug is a potent SERM/D developed to treat and prevent breast cancer and other conditions like Duchenne Muscular Dystrophy.
In December 2025, the U.S. Food and Drug Administration (FDA) granted Rare Pediatric Disease (RPD) designation to Atossa's lead drug candidate, (Z)-Endoxifen, for the treatment of Duchenne Muscular Dystrophy. This was a significant regulatory milestone as it opened up a new potential therapeutic area for the company's primary asset and made the drug eligible for a valuable Priority Review Voucher upon approval.
In 2025, Atossa Therapeutics initiated a significant strategic shift by pursuing an accelerated regulatory pathway for its lead drug, (Z)-endoxifen, for breast cancer risk reduction. This involved engaging an internationally recognized FDA law firm and senior regulatory experts to leverage existing data and requesting a Type C meeting with the FDA to align on requirements for a New Drug Application (NDA).
Overall rating: C+
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