Quantum Corporation

QMCO

Financials

10-QQ1 ended 06/30/2608/11/26 10-KFY 202606/25/26 10-QQ3 ended 12/31/2502/17/26 10-QQ2 ended 09/30/2511/13/25 10-Q/AQ1 ended 06/30/2509/23/25

Disclosures

8-KCurrent report10/09/26 8-KChange in Directors or Officers; Other Events09/28/26 8-KCurrent report09/17/26 8-KChange in Directors or Officers; Other Events09/01/26 8-KCurrent report08/14/26

Prospectuses and Registrations

S-8Registration of securities for employees09/25/26 424B3Prospectus07/27/26 S-1Registration statement (IPO)07/14/26 424B3Prospectus02/24/26 S-1Registration statement (IPO)02/19/26

Proxies

DEF 14ADefinitive proxy07/29/26 DEFA14AAdditional proxy materials07/29/26 DEFA14AAdditional proxy materials12/02/25 DEF 14ADefinitive proxy10/31/25 DEFA14AAdditional proxy materials10/31/25

Ownership

Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26

Other

ARSAnnual report to shareholders07/29/26 EFFECTRequest for effectiveness07/24/26 NT 10-KLate filing notification (10-K)06/15/26 SDConflict Minerals disclosure05/29/26 EFFECTRequest for effectiveness02/23/26