Atossa Therapeutics, Inc. operates as a clinical-stage biopharmaceutical company that develops medicines in the areas of unmet medical need in oncology for women breast cancer and other conditions in the United States. The company's lead drug candidate is oral (Z)-endoxifen, an active metabolite of tamoxifen, which is in Phase II clinical trials to treat and prevent breast cancer. It also develops immunotherapy/chimeric antigen receptor therapy programs. The company was formerly known as Atossa Genetics Inc. and changed its name to Atossa Therapeutics, Inc. in January 2020. Atossa Therapeutics, Inc. was founded in 2008 and is based in Seattle, Washington. Show more

107 Spring Street, Seattle, WA, 98104, United States

Biotechnology

Healthcare

Market Cap

44.0M

52 Wk Range

$3.76 - $19.35

Previous Close

$5.11

Open

$5.01

Volume

71,797

Day Range

$5.00 - $5.56

Enterprise Value

2.705M

Cash

41.3M

Avg Qtr Burn

-10.54M

Insider Ownership

0.07%

Institutional Own.

21.46%

Qtr Updated

12/31/25

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Drug & Indication	Stage & Event	Catalyst Date
(Z)-Endoxifen (Estrogen Modulator) Details Metastatic Breast Cancer	Phase 2 Data readout	Some catalyst date You must sign up to see the catalyst details. You must sign up to see the catalyst details. You must sign up to see the catalyst details. You must sign up to see the catalyst details.Sign up now.
(Z)-endoxifen Details Ductal Carcinoma In Situ	Phase 2 Update	Some catalyst date You must sign up to see the catalyst details. You must sign up to see the catalyst details. You must sign up to see the catalyst details. You must sign up to see the catalyst details.Sign up now.
(Z)-endoxifen + Abemaciclib (VERZENIO®) Details Breast cancer	Phase 2 Update	Some catalyst date You must sign up to see the catalyst details. You must sign up to see the catalyst details. You must sign up to see the catalyst details. You must sign up to see the catalyst details.Sign up now.
AT-301 Details COVID-19	Failed Discontinued	Some catalyst date You must sign up to see the catalyst details. You must sign up to see the catalyst details. You must sign up to see the catalyst details. You must sign up to see the catalyst details.Sign up now.
AT-H201 Details COVID-19	Failed Discontinued	Some catalyst date You must sign up to see the catalyst details. You must sign up to see the catalyst details. You must sign up to see the catalyst details. You must sign up to see the catalyst details.Sign up now.