#1 Granted as annual refresh grant shares. Grant of Restricted Stock Units (RSUs), each of which represents a contingent right to receive one share of common stock of QMCO. Vesting is subject to continued employment with QMCO through the service vesting date, which occurs in three equal annual installments on January 1, 2025, January 1, 2026 and January 1, 2027. Delayed filing arose from an administrative error related to implementing and configuring QMCO's new stock plan administration platform.

#1 (1) Grant of Restricted Stock Units (RSUs), each of which represents a contingent right to receive one share of common stock of QMCO. Vesting is subject to continued employment with QMCO through the service vesting date, which occurs in three equal annual installments on October 1, 2025, October 1, 2026 and October 1, 2027. Delayed filing arose from an error related to effecting the reverse stock split within QMCOs stock plan administration platform and the resulting delay of the distribution of the equity award agreement to reporting person. Reporting person has elected to continue to use the grant date for the reported transaction date notwithstanding the delayed distribution of the equity award agreement.

#1 Represents the number of shares automatically sold on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of restricted stock units granted on October 1, 2021 and July 1, 2022.

#1 Represents the number of shares automatically sold, on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of restricted stock units and performance-based stock units granted on July 1, 2020, and restricted stock units on July 1, 2022.

#2 Includes 5,035 shares acquired under Quantum Corporation's Employee Stock Purchase Plan on February 3, 2023.