QUANTUM CORP /DE/ (QMCO) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-04-01 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: QUANTUM CORP /DE/ (QMCO) CIK: 0000709283 --- Reporting Owner --- Name: Craythorne Anthony CIK: 0002075430 Role: Officer (Chief Revenue Officer) --- Derivative Transactions --- [Transaction #1] Security: Employee Stock Option (right to buy) Date: 2026-04-01 | Code: A (Grant or award) Shares: +148,500 | Price: $0.00 Exercisable: N/A | Expires: 2033-04-01 Shares Owned After: 148,500 | Ownership: D (Direct) Footnotes: [F1] This nonstatutory stock option vests over four years in equal monthly installments beginning on April 1, 2026, subject to the Reporting Person's continued service through each vesting date. [F1] This nonstatutory stock option vests over four years in equal monthly installments beginning on April 1, 2026, subject to the Reporting Person's continued service through each vesting date. --- Footnotes (Complete Index) --- F1: This nonstatutory stock option vests over four years in equal monthly installments beginning on April 1, 2026, subject to the Reporting Person's continued service through each vesting date. --- Signature --- /s/ /s/ Tara Ilges, attorney-in-fact for Anthony Craythorne (2026-04-03)