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: 2026-03-04 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: QUANTUM CORP /DE/ (QMCO) CIK: 0000709283 --- Reporting Owner --- Name: White William Hillis CIK: 0002108496 Role: Officer (Chief Financial Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-03-04 | Code: A (Grant or award) Shares: +25,000 | Price: $0.00 Shares Owned After: 25,000 | Ownership: D (Direct) Footnotes: [F1] Grant of 25,000 restricted stock units (RSUs), each of which represents a contingent right to receive one share of common stock of QMCO. The RSUs vest in three equal annual installments beginning on March 2, 2027, subject to the Reporting Person's continued service through each vesting date. --- Footnotes (Complete Index) --- F1: Grant of 25,000 restricted stock units (RSUs), each of which represents a contingent right to receive one share of common stock of QMCO. The RSUs vest in three equal annual installments beginning on March 2, 2027, subject to the Reporting Person's continued service through each vesting date. --- Signature --- /s/ /s/ Tara Ilges, attorney-in-fact for William Hillis White (2026-03-04)