Atossa Therapeutics Inc. (NASDAQ: ATOS) Stock Information | RedChip
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Atossa Therapeutics Inc. (NASDAQ: ATOS)
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$1.87
+0.0950 ( +5.37% ) 278.2K

Atossa Therapeutics, Inc. is a clinical-stage biopharmaceutical company developing innovative medicines in areas of significant unmet medical need in oncology with a focus on using (Z)-endoxifen to prevent and treat breast cancer.

Clinical Trial Pipeline Stages


Drug Name Stage
(Z)-endoxifenDetailsCancer, Carcinoma Phase 2
(Z)-endoxifen + Abemaciclib (VERZENIO®)DetailsCancer, Breast cancer Phase 2
AT-301DetailsCOVID-19 Failed
AT-H201DetailsCOVID-19 Failed

Market Data


Open $1.87
Previous Close $1.77
Volume 278.2K
Market Cap $17.46M
Day Range $1.74 - $1.91
52 Week Range $1.70 - $19.35
Shares Outstanding 9.98M
Change % +5.37%
Net Change ▲ 0.0950
Insider Ownership -0.31%
Exchange NASDAQ
SectorHealthcare
IndustryBiotechnology: Pharmaceutical Preparations
IPO Year2012
CountryUnited States
UnderwriterIPO Intelligence Only

Insider Ownership Transactions

Total Amount Purchased: -3,219,895.00

Date Type Amount Purchased Purchaser
2025-05-22 Buy 11239.00 QUAY STEVEN C
2024-07-01 Sale -125000.00 Finn Jonathan
2024-07-01 Sale -125000.00 Steinhart Richard I
2024-07-01 Sale -125000.00 Remmel H. Lawrence
2024-07-01 Sale -125000.00 Chen Shu-Chih
2024-07-01 Sale -577700.00 Rees Heather
2024-07-01 Sale -1795100.00 QUAY STEVEN C
2024-07-01 Sale -125000.00 Galli Stephen J
2024-07-01 Sale -125000.00 Cigler Tessa
2024-04-11 Buy 25000.00 Finn Jonathan

SEC Filings


Form Type Description Pages Date
4 Insider transactions 1 Mar 31, 2026
def Proxies and info statements 19 Mar 30, 2026
4 Insider transactions 1 Mar 30, 2026
8-k 8K-related 11 Mar 25, 2026
10-k Annual reports 73 Mar 25, 2026
pre Proxies and info statements 19 Mar 20, 2026
424b5 Other 4 Feb 20, 2026
8-k 8K-related 15 Feb 20, 2026
424b3 Other 2 Feb 20, 2026
8-k 8K-related 10 Feb 17, 2026

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