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Atossa Therapeutics Inc

ATOS
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4.850USD
-0.300-5.83%
Close 05/15, 16:00ETQuotes delayed by 15 min
41.77MMarket Cap
LossP/E TTM

Atossa Therapeutics Inc

4.850
-0.300-5.83%

More Details of Atossa Therapeutics Inc Company

Atossa Therapeutics, Inc. is a clinical-stage biopharmaceutical company. It is engaged in developing medicines in areas of unmet medical need in oncology with a focus on women’s breast cancer and other breast conditions. Its lead drug candidate under development is oral (Z)-endoxifen, which it is developing for both the prevention and treatment of breast cancer. (Z)-endoxifen is the potent Selective Estrogen Receptor Modulator for estrogen receptor inhibition and causes estrogen receptor degradation. In addition to its potent anti-estrogen effects, (Z)-endoxifen has been shown to target PKCB1, a known oncogenic protein, at clinically attainable blood concentrations. It is developing a form of (Z)-endoxifen which is administered orally for the potential treatment of breast cancer and reduction of breast density. It has completed four Phase I clinical studies and two Phase II clinical studies with its proprietary (Z)-endoxifen (including oral and topical formulations).

Atossa Therapeutics Inc Info

Ticker SymbolATOS
Company nameAtossa Therapeutics Inc
IPO dateNov 08, 2012
CEOQuay (Steven C)
Number of employees13
Security typeOrdinary Share
Fiscal year-endNov 08
Address1448 NW MARKET STREET
CitySEATTLE
Stock exchangeNASDAQ OMX - NASDAQ BASIC
CountryUnited States of America
Postal code98107
Phone12065880256
Websitehttps://atossatherapeutics.com/
Ticker SymbolATOS
IPO dateNov 08, 2012
CEOQuay (Steven C)

Company Executives of Atossa Therapeutics Inc

Name
Name/Position
Position
Shareholding
Change
Dr. Steven C. (Steve) Quay, M.D., Ph.D.
Dr. Steven C. (Steve) Quay, M.D., Ph.D.
Chairman of the Board, President, Chief Executive Officer
Chairman of the Board, President, Chief Executive Officer
67.41K
+63.62%
Dr. Shu-Chih Chen, Ph.D.
Dr. Shu-Chih Chen, Ph.D.
Director
Director
1.48K
--
Dr. Stephen J. Galli, M.D.
Dr. Stephen J. Galli, M.D.
Independent Director
Independent Director
7.00
--
Mr. H. Lawrence Remmel, Esq., J.D.
Mr. H. Lawrence Remmel, Esq., J.D.
Lead Independent Director
Lead Independent Director
--
--
Mr. Richard I. Steinhart
Mr. Richard I. Steinhart
Independent Director
Independent Director
--
--
Ms. Janet Rose Rea
Ms. Janet Rose Rea
Senior Vice President - R&D
Senior Vice President - R&D
--
--
Mr. Jonathan F. Finn
Mr. Jonathan F. Finn
Independent Director
Independent Director
--
--
Dr. Tessa Cigler, M.D.
Dr. Tessa Cigler, M.D.
Independent Director
Independent Director
--
--
Mr. Michael Parks
Mr. Michael Parks
Vice President, Investor and Public Relations
Vice President, Investor and Public Relations
--
--
Mr. Mark Daniel, CPA
Mr. Mark Daniel, CPA
Chief Financial Officer
Chief Financial Officer
--
--
Name
Name/Position
Position
Shareholding
Change
Dr. Steven C. (Steve) Quay, M.D., Ph.D.
Dr. Steven C. (Steve) Quay, M.D., Ph.D.
Chairman of the Board, President, Chief Executive Officer
Chairman of the Board, President, Chief Executive Officer
67.41K
+63.62%
Dr. Shu-Chih Chen, Ph.D.
Dr. Shu-Chih Chen, Ph.D.
Director
Director
1.48K
--
Dr. Stephen J. Galli, M.D.
Dr. Stephen J. Galli, M.D.
Independent Director
Independent Director
7.00
--
Mr. H. Lawrence Remmel, Esq., J.D.
Mr. H. Lawrence Remmel, Esq., J.D.
Lead Independent Director
Lead Independent Director
--
--
Mr. Richard I. Steinhart
Mr. Richard I. Steinhart
Independent Director
Independent Director
--
--
Ms. Janet Rose Rea
Ms. Janet Rose Rea
Senior Vice President - R&D
Senior Vice President - R&D
--
--

Revenue Breakdown

Relevant data have not been disclosed by the company yet.
Relevant data have not been disclosed by the company yet.
By Business
By Region
Relevant data have not been disclosed by the company yet.

Shareholding Stats

Updated: Thu, May 14
Updated: Thu, May 14
Shareholders
Shareholder Types
Shareholders
Shareholders
Proportion
Heights Capital Management, Inc.
4.38%
Vanguard Capital Management, LLC
4.05%
Columbia Threadneedle Investments (US)
2.93%
Renaissance Technologies LLC
1.60%
BlackRock Institutional Trust Company, N.A.
1.55%
Other
85.48%
Shareholders
Shareholders
Proportion
Heights Capital Management, Inc.
4.38%
Vanguard Capital Management, LLC
4.05%
Columbia Threadneedle Investments (US)
2.93%
Renaissance Technologies LLC
1.60%
BlackRock Institutional Trust Company, N.A.
1.55%
Other
85.48%
Shareholder Types
Shareholders
Proportion
Investment Advisor
12.36%
Investment Advisor/Hedge Fund
5.96%
Hedge Fund
3.24%
Individual Investor
1.56%
Research Firm
0.31%
Venture Capital
0.13%
Other
76.44%

Institutional Shareholding

Updated: Wed, Apr 1
Updated: Wed, Apr 1
Reporting Period
No. of institutions
Shares Held
Proportion
Change
2026Q1
186
1.90M
22.09%
-285.92K
2025Q4
176
25.18M
25.95%
--
2025Q3
178
25.18M
25.96%
-1.98M
2025Q2
175
27.17M
30.75%
-7.16M
2025Q1
162
34.33M
32.59%
-7.77M
2024Q4
159
35.91M
30.62%
+511.97K
2024Q3
161
35.40M
24.90%
+1.01M
2024Q2
158
34.27M
17.64%
+7.00M
2024Q1
159
27.27M
17.15%
+5.75M
2023Q4
161
16.28M
17.87%
-202.49K
View more

Shareholder Activity

Name
Shares Held
Proportion
Change
Chg %
Date
Heights Capital Management, Inc.
377.50K
4.38%
-140.00K
-27.05%
Dec 31, 2024
Columbia Threadneedle Investments (US)
252.74K
2.93%
+55.97K
+28.44%
Dec 31, 2025
Renaissance Technologies LLC
137.52K
1.6%
+34.28K
+33.20%
Dec 31, 2025
BlackRock Institutional Trust Company, N.A.
133.18K
1.55%
--
--
Dec 31, 2025
UBS Financial Services, Inc.
26.00K
0.3%
+8.62K
+49.59%
Dec 31, 2025
Geode Capital Management, L.L.C.
91.46K
1.06%
+642.00
+0.71%
Dec 31, 2025
Millennium Management LLC
82.86K
0.96%
-28.39K
-25.52%
Dec 31, 2025
Jacobs Levy Equity Management, Inc.
69.89K
0.81%
+69.89K
--
Dec 31, 2025
Quay (Steven C)
67.41K
0.78%
+42.89K
+174.90%
Mar 27, 2026
View more

Related ETFs

Updated: Sat, Dec 6
Updated: Sat, Dec 6
Name
Proportion
Global X Russell 2000 ETF
0%
ProShares UltraPro Russell2000
0%
ProShares Hedge Replication ETF
0%
Proshares Ultra Russell 2000
0%
iShares Micro-Cap ETF
0%
iShares Russell 2000 Value ETF
0%
iShares Russell 2000 Growth ETF
0%
iShares Russell 2000 ETF
0%
Global X Russell 2000 ETF
Proportion0%
ProShares UltraPro Russell2000
Proportion0%
ProShares Hedge Replication ETF
Proportion0%
Proshares Ultra Russell 2000
Proportion0%
iShares Micro-Cap ETF
Proportion0%
iShares Russell 2000 Value ETF
Proportion0%
iShares Russell 2000 Growth ETF
Proportion0%
iShares Russell 2000 ETF
Proportion0%

Dividend

A total of 0.00 USD has been distributed in dividends over the past 5 years.
Date
Dividend
Record Date
Payment Date
Ex-dividend Date
No Data

Stock Splits

Date
Ex-dividend Date
Type
Ratio
Jan 26, 2026
Merger
15→1
Date
Ex-dividend Date
Type
Ratio
Jan 26, 2026
Merger
15→1
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