0001488039 2026-09-18 2026-09-18 false 0001488039 8-K 2026-09-18 Atossa Therapeutics, Inc. DE 001-35610 26-4753208 1448 NW Market Street Suite 500 Seattle WA 98107 (206) 588-0256 false false false false Common Stock, $0.18 par value ATOS NASDAQ false