QUANTUM CORP /DE/ (QMCO): auditor change — Quantum dismisses Grant Thornton, appoints CohnReznick as auditor; cites material weaknesses in internal controls

Appointment of Independent Registered Public Accounting Firm As described above, the Audit Committee recently completed a competitive process to select an audit firm to serve as the Company’s independent registered public accounting firm for the fiscal year ending March 31, 2026, and related interim periods. On September 30, 2025 , the Company, at the recommendation of the Audit Committee, made the decision to select CohnReznick LLP (“CohnReznick”) as auditors for the Company for the fiscal year ending March 31, 2026, contingent upon the execution of an engagement letter following completion of CohnReznick’s standard client acceptance procedures.

Dismissal of Independent Registered Public Accounting Firm The Audit Committee (the “Audit Committee”) of the Board of Directors of Quantum Corporation (the “Company”) conducted a competitive process to determine the Company’s independent registered public accounting firm for the fiscal year ending March 31, 2026. As a result of this process and following careful deliberation, on September 30, 2025 , the Audit Committee dismissed Grant Thornton LLP (“Grant Thornton”) as the Company's independent registered public accounting firm, effective as of that same date.