X0609 4 2026-10-01 0 0000709283 QUANTUM CORP /DE/ QMCO 0001411509 FICHTHORN JOHN false C/O QUANTUM CORPORATION 10770 E. BRIARWOOD AVE. CENTENNIAL CO 80112 1 0 1 0 0 Common Stock 2026-10-01 4 A 0 12000 0 A 40896 D Common Stock 14104620 I by Dialectic Technology SPV LLC Grant of restricted stock units (RSUs), each of which represents a contingent right to receive one share of common stock of QMCO. The RSUs vest in full on the earlier of October 1, 2027 or the date of the Companys next annual meeting of stockholders, in each case subject to the Reporting Persons continued service on the Companys Board of Directors. These shares are held directly by Dialectic Technology SPV LLC (Dialectic), a 10% holder of the Issuer and indirectly by the Reporting Person. Dialectic Technology Manager LLC is the Manager of Dialectic, and the Reporting Person is the Manager of Dialectic Technology Manager LLC. The Reporting Person disclaims beneficial ownership of these shares held by Dialectic, except to the extent of the Reporting Persons pecuniary interest therein, if any. Tara Ilges, attorney-in-fact for John A. Fichthorn 2026-10-05