Atossa Therapeutics, Inc.

ATOS·NASDAQ·$4.95Share Price as of 11/2·$43MMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/07/26 10-QQ1 ended 03/31/2605/08/26 10-KFY 202503/25/26 10-QQ3 ended 09/30/2511/12/25 10-QQ2 ended 06/30/2508/12/25

Disclosures

8-KCurrent report10/09/26 8-KCurrent report09/29/26 8-KCurrent report09/18/26 8-KCurrent report08/07/26 8-KCurrent report06/11/26

Prospectuses and Registrations

424B5Prospectus supplement06/12/26 424B3Prospectus02/20/26 424B5Prospectus supplement02/20/26 S-8Registration of securities for employees03/26/25 424B5Prospectus supplement11/19/24

Proxies

DEF 14ADefinitive proxy03/30/26 PRE 14APreliminary proxy03/20/26 DEF 14ADefinitive proxy12/22/25 PRE 14APreliminary proxy12/12/25 DEF 14ADefinitive proxy03/26/25

Ownership

Form 4Insider transaction05/14/26 Form 4Insider transaction05/14/26 Form 4Insider transaction05/14/26 Form 4Insider transaction05/14/26 Form 4Insider transaction05/14/26

Other

ARSAnnual report to shareholders03/30/26 ARSAnnual report to shareholders03/26/25 EFFECTRequest for effectiveness05/23/24 CORRESPCorrespondence with the SEC05/21/24 UPLOADLetter from the SEC05/21/24