Atossa Therapeutics, Inc. (ATOS): Shares Outstanding

Annual figures by period end, from SEC filings.

Stock splits: 1-for-15, first reflected in a filing dated 2026-03-25. Figures are as filed: per-share figures and share counts last reported before a split are on the old share basis, so changes and growth rates across a split are not shown. Splits are read from the filings' own restatements, so a share conversion in a merger or reorganization shows up the same way.

8.61M

As of 2025-12-31

9.98M

As of 2026-06-30

2011-12-31 Shares Outstanding (shares) 2025-12-31

Paler bars were last filed before a stock split, on the old share basis.

Period ended	Shares Outstanding	Change YoY	Source filing
2025-12-31	8.61M	0.0%	2026-03-25, Balance as of period end
2024-12-31	8.61M	n/c	2026-03-25, Balance as of period end
2023-12-31	125.30M	-1.0%	2025-03-25, Balance as of period end
2022-12-31	126.62M	0.0%	2024-04-01, Balance as of period end
2021-12-31	126.62M	+166.3%	2023-03-22, Balance as of period end
2020-12-31	47.55M	n/c	2022-02-28, Balance as of period end
2019-12-31	9.13M	n/c	2021-03-31, Balance as of period end
2018-12-31	5.85M	+120.5%	2020-03-26, Balance as of period end
2017-12-31	2.65M	n/c	2019-03-28, Balance as of period end
2016-12-31	3.79M	+73.9%	2018-03-08, Balance as of period end
2015-12-31	2.18M	-91.1%	2017-03-21, Balance as of period end
2014-12-31	24.56M	+32.2%	2016-03-30, Balance as of period end
2013-12-31	18.57M	n/c	2015-03-30, Balance as of period end
2012-12-31	12.92M	+14.8%	2014-03-27, Balance as of period end
2011-12-31	11.26M	n/a	2013-03-28, Balance as of period end