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Atossa Therapeutics

ATOS

Market cap $23.9M

2.39 USD

-0.05

2.05%

At close Updated Oct 12, 4:00 PM EDT

Pre-market

After hours

2.41

+0.02

0.84%

1 day

-2.05%

5 days

-2.85%

1 month

-3.63%

3 months

-0.42%

6 months

-54.99%

Year to date

-74.74%

1 year

-84.83%

5 years

-94.74%

10 years

-99.3%

About: Atossa Therapeutics Inc is a clinical-stage biopharmaceutical company engaged in the development of proprietary medicines for oncology, with a focus on breast cancer and related conditions. The company's lead product candidate, oral (Z)-endoxifen, is a selective estrogen receptor modulator and degrader (SERM/SERD) in Phase 2 clinical development, being evaluated for the treatment and prevention of breast cancer and other indications.

Employees: 14

Healthcare Biotechnology

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Atossa Therapeutics Executes Contingent Value Rights Agreement Providing Shareholders Participation in Potential Priority Review Voucher Value

Board declares one stapled CVR for each share of Atossa common stock outstanding as of October 19, 2026 record date or issued thereafter CVRs entitle holders to 25% of net proceeds from monetization of Atossa's first qualifying priority review voucher, subject to a $50 million aggregate payment cap SEATTLE, Oct. 9, 2026 /PRNewswire/ -- Atossa Therapeutics, Inc. (Nasdaq: ATOS) ("Atossa" or the "Company"), a clinical-stage biopharmaceutical company developing innovative medicines in oncology and other areas of significant unmet need, today announced that it has entered into a definitive Stapled Contingent Value Rights Agreement (the "CVR Agreement") with VStock Transfer, LLC, as rights agent, implementing the stapled contingent value rights ("CVRs") plan previously announced on September 29, 2026. In connection with the execution of the CVR Agreement, Atossa's Board of Directors declared a dividend of one stapled CVR for each share of Atossa common stock outstanding at the close of business on October 19, 2026, the record date.

Atossa Therapeutics Executes Contingent Value Rights Agreement Providing Shareholders Participation in Potential Priority Review Voucher Value

Atossa Therapeutics Announces Plan to Issue Stapled CVR for Shareholders Tied to Potential Rare Pediatric Disease Priority Review Voucher

Shareholders would receive one CVR for each ATOS share held as of the record date or issued thereafter CVRs would entitle holders to 25% of net proceeds from monetization of Atossa's first qualifying priority review voucher, subject to a $50 million aggregate payment cap SEATTLE, Sept. 29, 2026 /PRNewswire/ -- Atossa Therapeutics, Inc. (Nasdaq: ATOS) ("Atossa" or the "Company"), a clinical-stage biopharmaceutical company developing innovative medicines in oncology and other areas of significant unmet need, today announced that its Board of Directors has approved a plan to issue one contingent value right ("CVR") for each share of Atossa common stock to enable shareholders to share in a portion of any proceeds received from the monetization of Atossa's first qualifying rare pediatric disease priority review voucher.

Atossa Therapeutics Announces Plan to Issue Stapled CVR for Shareholders Tied to Potential Rare Pediatric Disease Priority Review Voucher

Atossa Therapeutics CEO Dr. Steven Quay to Participate in ARDD 2026 Panel on Clinical Trials and Regulatory Pathways for Diseases of Aging

Panel at Harvard University will explore translating evidence in diseases of aging into new therapeutics and regulatory pathways SEATTLE, Sept. 24, 2026 /PRNewswire/ -- Atossa Therapeutics, Inc. (Nasdaq: ATOS) ("Atossa" or the "Company"), a clinical-stage biopharmaceutical company, today announced that Steven Quay, M.D.

Atossa Therapeutics CEO Dr. Steven Quay to Participate in ARDD 2026 Panel on Clinical Trials and Regulatory Pathways for Diseases of Aging

Atossa Therapeutics Reports Second Quarter 2026 Financial Results and Provides a Corporate Update

SEATTLE, Aug. 7, 2026 /PRNewswire/ -- Atossa Therapeutics, Inc. (Nasdaq: ATOS) (Atossa or the Company), a clinical-stage biopharmaceutical company developing novel therapies in oncology and other areas of high unmet clinical need, today announced its financial results and provided an update on recent corporate developments for the second quarter ended June 30, 2026. "During the quarter, we executed well across the business," stated Dr. Steven Quay, M.D.

Atossa Therapeutics Reports Second Quarter 2026 Financial Results and Provides a Corporate Update

Atossa Therapeutics Announces Publication of Novel (Z)-Endoxifen-Related Compounds Demonstrating Potent Anti-Cancer Activity in ER-Positive Breast Cancer

Peer-reviewed preclinical study published in npj Breast Cancer identifies new chemical entities with activity in ESR1-mutant models Findings suggest potential for combination with abemaciclib SEATTLE, July 28, 2026 /PRNewswire/ -- Atossa Therapeutics, Inc. (NASDAQ: ATOS) ("Atossa" or the "Company"), a clinical-stage biopharmaceutical company developing novel therapies in oncology and other areas of significant unmet clinical need, today announced the publication of a peer-reviewed preclinical study in npj Breast Cancer evaluating five novel chemical entities structurally related to (Z)-endoxifen. The study titled, "Novel (Z)-endoxifen-related new chemical entities exhibit potent anti-cancer activity in ERα+ breast cancer," reported anti-estrogenic and anti-cancer activity across multiple estrogen receptor-positive breast cancer models, including models harboring clinically relevant activating mutations in ESR1.

Atossa Therapeutics Announces Publication of Novel (Z)-Endoxifen-Related Compounds Demonstrating Potent Anti-Cancer Activity in ER-Positive Breast Cancer

Atossa Therapeutics Announces Presentation of Mechanism-Driven (Z)-Endoxifen Data in McCune-Albright Syndrome at AACR Special Conference on Rare Cancers

Preclinical Data Poster Highlights Dual Estrogen Receptor and PKC-β/AKT Pathway Modulation as a Potential Therapeutic Strategy for Estrogen-Driven Pathology in McCune-Albright syndrome SEATTLE, July 21, 2026 /PRNewswire/ -- Atossa Therapeutics, Inc. (NASDAQ: ATOS) ("Atossa" or the "Company"), a clinical-stage biopharmaceutical company developing novel therapies in oncology and other areas of significant unmet clinical need, today announced that a poster presentation titled "Dual estrogen receptor and PKC-β signaling modulation by (Z)-Endoxifen: A mechanism-driven therapeutic strategy for estrogen-driven pathology in McCune-Albright Syndrome" was presented at the AACR Special Conference in Cancer Research: Breaking Barriers in the Fight Against Rare Cancers, which took place July 18-20, 2026, in Vancouver, BC, Canada. Presentation Details Session Type: Poster Session A Date: Saturday, July 18, 2026, 7:30-9:30 pm PT Abstract Number: A010 Location: AACR Special Conference in Cancer Research: Breaking Barriers in the Fight Against Rare Cancers, Vancouver, BC, Canada Poster Title: Dual estrogen receptor and PKC-β signaling modulation by (Z)-Endoxifen: A mechanism-driven therapeutic strategy for estrogen-driven pathology in McCune-Albright Syndrome Presenter: Sandra Hammer, PhD, Atossa Therapeutics Inc. Summary: The poster supports a dual mechanism of action for (Z)-endoxifen in estrogen-driven pathology relevant to McCune Albright Syndrome-associated Peripheral Precocious Puberty (MAS-PPP): the blockade of ER-mediated transcription downstream of autonomous estrogen production and suppression of PKC-β/AKT-associated proliferative and cell-cycle signaling.

Atossa Therapeutics Announces Presentation of Mechanism-Driven (Z)-Endoxifen Data in McCune-Albright Syndrome at AACR Special Conference on Rare Cancers

Atossa Therapeutics Announces Closing of Registered Direct Offering of up to $16.5 Million in Gross Proceeds

$4.5 million upfront with up to an additional $12 million of potential aggregate gross proceeds upon exercise in full of warrants SEATTLE, June 12, 2026 /PRNewswire/ -- Atossa Therapeutics, Inc. (Nasdaq: ATOS) ("Atossa" or the "Company"), a clinical-stage biopharmaceutical company developing novel therapies in oncology and other areas of high unmet clinical need, today announced the closing of its previously announced registered direct offering of 1,363,637 shares (the "Shares") of its common stock, par value $0.18 per share ("Common Stock") (or common stock equivalents in lieu thereof), Series A warrants to purchase up to 1,363,637 shares of Common Stock and short-term Series B warrants to purchase up to 1,363,637 shares of Common Stock (such warrants, collectively, the "Series Warrants") and accompanying Series Warrants. The Series Warrants are exercisable six months following the date of issuance.

Atossa Therapeutics Announces Closing of Registered Direct Offering of up to $16.5 Million in Gross Proceeds

Atossa Therapeutics Announces Registered Direct Offering of up to $16.5 Million in Gross Proceeds

$4.5 million upfront with up to an additional $12 million of potential aggregate gross proceeds upon exercise in full of warrants SEATTLE, June 11, 2026 /PRNewswire/ -- Atossa Therapeutics, Inc. (Nasdaq: ATOS) ("Atossa" or the "Company"), a clinical-stage biopharmaceutical company developing novel therapies in oncology and other areas of high unmet clinical need, today announced that it has entered into a securities purchase agreement with institutional investors for the purchase and sale of 1,363,638 shares (the "Shares") of its common stock, par value $0.18 per share ("Common Stock") (or common stock equivalents in lieu thereof), Series A warrants to purchase up to 1,363,638 shares of Common Stock and short-term Series B warrants to purchase up to 1,363,638 shares of Common Stock (such warrants, collectively, the "Series Warrants") and accompanying Series Warrants in a registered direct offering. The Series Warrants will be exercisable six months following the date of issuance.

Atossa Therapeutics Announces Registered Direct Offering of up to $16.5 Million in Gross Proceeds

Atossa Therapeutics Announces ASCO 2026 Abstracts Highlighting (Z)-Endoxifen Activity Across ESR1 Mutations and Ongoing EVANGELINE Phase 2 Trial

Preclinical Data Abstract Demonstrates Robust Estrogen Receptor (ER) Inhibition in ESR1-Mutant Breast Cancer Models at Clinically Relevant Concentrations Trial-in-Progress Abstract Details Ongoing Phase 2 EVANGELINE Study of (Z)-Endoxifen Plus Goserelin as Neoadjuvant Therapy in Premenopausal Women With ER+/HER2- Breast Cancer SEATTLE, May 27, 2026 /PRNewswire/ -- Atossa Therapeutics, Inc. (Nasdaq: ATOS) ("Atossa" or the "Company"), a clinical-stage biopharmaceutical company developing novel therapies in oncology and other areas of significant unmet medical need, today announced that two abstracts featuring (Z)-endoxifen have been accepted for presentation at the 2026 American Society of Clinical Oncology (ASCO) Annual Meeting, being held May 29 to June 2, 2026 in Chicago, IL. "Both abstracts highlight the scientific rationale and ongoing clinical development of (Z)-endoxifen in ER-positive breast cancer," said Dr. Steven C.

Atossa Therapeutics Announces ASCO 2026 Abstracts Highlighting (Z)-Endoxifen Activity Across ESR1 Mutations and Ongoing EVANGELINE Phase 2 Trial

Atossa Therapeutics Announces Acceptance of Manuscript Highlighting Utrophin-Modulation Potential of (Z)-Endoxifen in Duchenne Muscular Dystrophy

Review article accepted for publication in Degenerative Neurological and Neuromuscular Disease and builds on Atossa's previously published Duchenne Muscular Dystrophy (DMD) research SEATTLE, May 20, 2026 /PRNewswire/ -- Atossa Therapeutics, Inc. (NASDAQ: ATOS) (Atossa or the Company), a clinical-stage biopharmaceutical company developing novel therapies in oncology and other areas of significant unmet clinical need, today announced that the manuscript titled, "(Z)-Endoxifen as a Potential Modulator of Utrophin Pathways in Duchenne Muscular Dystrophy: A Mechanistic and Transcriptomic Perspective," has been accepted for publication in Degenerative Neurological and Neuromuscular Disease. The review centers on utrophin, a structural and functional homolog of dystrophin.

Atossa Therapeutics Announces Acceptance of Manuscript Highlighting Utrophin-Modulation Potential of (Z)-Endoxifen in Duchenne Muscular Dystrophy

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