QMCO

SEC source: 0000709283-25-000009 · wk-form4_1745442851.xml · nonDerivative · entry 2

Lerner James J · CIK 0001602567 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 110,848

F1 · shares: Represents the number of shares automatically sold on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of performance-based stock units granted on July 1, 2022.

F2 · price: Represents a weighted average price. These shares were sold as part of block trades for multiple security holders of the issuer on April 21, 2025, at a price ranging from $9.6144 to $9.67. The reporting person undertakes to provide upon request by the Securities and Exchange Commission, the issuer, or a securityholder of the issuer detailed information regarding the number of shares sold and the prices at which the transactions were executed.

SEC source: 0000709283-25-000009 · wk-form4_1745442851.xml · nonDerivative · entry 1

Lerner James J · CIK 0001602567 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 113,632

SEC source: 0000709283-25-000008 · wk-form4_1745442839.xml · nonDerivative · entry 2

Cabrera Brian E · CIK 0001314901 · SVP Chief Admin Ofcr & Secy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,736

F1 · shares: Represents the number of shares automatically sold on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of performance-based stock units granted on July 1, 2022, and November 1, 2022.

F2 · price: Represents a weighted average price. These shares were sold as part of block trades for multiple security holders of the issuer on April 21, 2025, at a price ranging from $9.6144 to $9.67. The reporting person undertakes to provide upon request by the Securities and Exchange Commission, the issuer, or a securityholder of the issuer detailed information regarding the number of shares sold and the prices at which the transactions were executed.

SEC source: 0000709283-25-000008 · wk-form4_1745442839.xml · nonDerivative · entry 1

Cabrera Brian E · CIK 0001314901 · SVP Chief Admin Ofcr & Secy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,814

SEC source: 0000950170-25-055367 · ownership.xml · nonDerivative · entry 1

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

F1 · ownership.nature: The securities sold were held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which held 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which held 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000709283-25-000005 · wk-form4_1743799053.xml · nonDerivative · entry 1

Nash Laura A. · CIK 0001979364 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,652

F1 · shares: 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 April 1, 2024.

F2 · price: Represents a weighted average price. These shares were sold as part of block trades for multiple security holders of the issuer on April 2, 2025, at prices ranging from $12.81 to $12.90, inclusive. The reporting person undertakes to provide upon request by the Securities and Exchange Commission, the issuer, or a securityholder of the issuer detailed information regarding the price and number of shares sold within the range indicated herein with regard to the block trades.

SEC source: 0000709283-25-000001 · wk-form4_1738792089.xml · nonDerivative · entry 1

Gianella Kenneth P. · CIK 0001677143 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,402

F1 · shares: 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 February 1, 2023.

SEC source: 0000950170-25-006931 · ownership.xml · nonDerivative · entry 1

Lerner James J · CIK 0001602567 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 107,804

F1 · shares: 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 January 1, 2024.

SEC source: 0000950170-25-006929 · ownership.xml · nonDerivative · entry 1

Spanjaard Henk Jan · CIK 0002000334 · Chief Revenue Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,903

F1 · shares: 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 January 1, 2024.

SEC source: 0000950170-25-006922 · ownership.xml · nonDerivative · entry 1

Gianella Kenneth P. · CIK 0001677143 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,681

F1 · shares: 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 January 1, 2024.

SEC source: 0000950170-25-006920 · ownership.xml · nonDerivative · entry 2

Cabrera Brian E · CIK 0001314901 · SVP Chief Admin Ofcr & Secy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,940

F2 · shares: 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 January 1, 2024.

SEC source: 0000950170-25-003094 · ownership.xml · derivative · entry 18

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 224,059 shares

Expires 2034-08-13

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · derivative · entry 17

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 18,750 shares

Expires 2034-07-11

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · derivative · entry 16

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 37,536 shares

Expires 2034-05-24

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · derivative · entry 15

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 63,435 shares

Expires 2033-06-01

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · derivative · entry 14

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 219,970 shares

Expires 2028-12-27

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · derivative · entry 13

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 114,155 shares

Expires 2030-06-16

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 12

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 962,127

F1 · kind: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · kind: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 11

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 984,709

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 10

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 760,650

F1 · kind: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · kind: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 9

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 762,539

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 8

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 743,789

F1 · kind: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · kind: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 7

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 747,572

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 6

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 710,036

F1 · kind: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · kind: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 5

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 716,429

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 4

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 652,994

F1 · kind: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · kind: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 3

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 745,964

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 2

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 525,994

F1 · kind: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · kind: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000950170-25-003094 · ownership.xml · nonDerivative · entry 1

PACIFIC INVESTMENT MANAGEMENT CO LLC · CIK 0001163368 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 626,572

F1 · ownership.nature: On January 3, 2025, the reporting person exercised (a) a warrant to purchase 114,155 shares of Quantum Corporation's common stock, par value $0.01 per share (the "Common Stock"), for $54.20 a share, (b) a warrant to purchase 219,970 shares of Common Stock for $26.00 a share, (c) a warrant to purchase 63,435 shares of Common Stock for $6.20 a share, (d) a warrant to purchase 37,536 shares of Common Stock for $6.20 a share, (e) a warrant to purchase 18,750 shares of Common Stock for $6.20 a share, and (f) a warrant to purchase 224,059 shares of Common Stock for $6.20 a share. The reporting person paid the exercise price for each of these warrants on a cashless basis, resulting in Quantum Corporation withholding an aggregate of 228,195 of the warrant shares to pay the exercise price and issuing to the reporting person the remaining 449,710 shares.

F2 · ownership.nature: (Continued from footnote 1) The securities are held by certain funds and accounts for which the reporting person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 289,620 shares of Common Stock and (ii) OC III LVS XL LP, which holds 672,507 shares of Common Stock. The reporting person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein.

SEC source: 0000709283-24-000050 · wk-form4_1733433320.xml · nonDerivative · entry 1

Gianella Kenneth P. · CIK 0001677143 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,910

F1 · shares: 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 February 1, 2023 and September 1, 2023.

SEC source: 0000709283-24-000049 · wk-form4_1733433308.xml · nonDerivative · entry 1

Spanjaard Henk Jan · CIK 0002000334 · Chief Revenue Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,662

F1 · shares: 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

SEC source: 0000709283-24-000048 · wk-form4_1733433298.xml · nonDerivative · entry 1

Lerner James J · CIK 0001602567 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 107,491

F1 · shares: 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.

SEC source: 0000709283-24-000047 · wk-form4_1733433288.xml · nonDerivative · entry 1

Nash Laura A. · CIK 0001979364 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,431

F1 · shares: 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, July 1, 2022 and July 1, 2023.

SEC source: 0000709283-24-000046 · wk-form4_1733433278.xml · nonDerivative · entry 1

Cabrera Brian E · CIK 0001314901 · SVP Chief Admin Ofcr & Secy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,958

F1 · shares: 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 May 1, 2021, October 1, 2021 and July 1, 2022.

SEC source: 0000950170-25-006920 · ownership.xml · nonDerivative · entry 1

Cabrera Brian E · CIK 0001314901 · SVP Chief Admin Ofcr & Secy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,936

F1 · shares: 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 November 1, 2021 and November 1, 2022.

SEC source: 0000950170-25-006916 · ownership.xml · nonDerivative · entry 1

Nash Laura A. · CIK 0001979364 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,788

F1 · shares: This amendment to the original Form 4 filed on December 5, 2024 is being filed to correct the amount of shares sold, to cover tax withholding obligations in connection with the vesting of restricted stock units.

F2 · balance_after: As a result of this error, the number of shares reported as beneficially owned by the reporting person following the corrected transaction reflects an increase in the number of shares reported as beneficially owned in the original Form 4.

SEC source: 0000950170-25-006915 · ownership.xml · nonDerivative · entry 1

Lerner James J · CIK 0001602567 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 110,315

F1 · shares: This amendment to the original Form 4 filed on December 5, 2024 is being filed to correct the amount of shares sold, to cover tax withholding obligations in connection with the vesting of restricted stock units.

F2 · balance_after: As a result of this error, the number of shares reported as beneficially owned by the reporting person following the corrected transaction reflects an increase in the number of shares reported as beneficially owned in the original Form 4.

SEC source: 0000950170-25-006913 · ownership.xml · nonDerivative · entry 1

Spanjaard Henk Jan · CIK 0002000334 · Chief Revenue Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,838

F1 · shares: This amendment to the original Form 4 filed on December 5, 2024 is being filed to correct the amount of shares sold, to cover tax withholding obligations in connection with the vesting of restricted stock units.

F2 · balance_after: As a result of this error, the number of shares reported as beneficially owned by the reporting person following the corrected transaction reflects an increase in the number of shares reported as beneficially owned in the original Form 4.

SEC source: 0000950170-25-006910 · ownership.xml · nonDerivative · entry 1

Gianella Kenneth P. · CIK 0001677143 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,168

F1 · shares: This amendment to the original Form 4 filed on December 5, 2024 is being filed to correct the amount of shares sold, to cover tax withholding obligations in connection with the vesting of restricted stock units.

F2 · balance_after: As a result of this error, the number of shares reported as beneficially owned by the reporting person following the corrected transaction reflects an increase in the number of shares reported as beneficially owned in the original Form 4.

SEC source: 0000950170-25-006909 · ownership.xml · nonDerivative · entry 1

Cabrera Brian E · CIK 0001314901 · SVP Chief Admin Ofcr & Secy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,227

F1 · shares: This amendment to the original Form 4 filed on December 5, 2024 is being filed to correct the amount of shares sold, to cover tax withholding obligations in connection with the vesting of restricted stock units.

F2 · balance_after: As a result of this error, the number of shares reported as beneficially owned by the reporting person following the corrected transaction reflects an increase in the number of shares reported as beneficially owned in the original Form 4.

SEC source: 0000709283-24-000034 · wk-form4_1730846669.xml · nonDerivative · entry 1

Tracy John R. · CIK 0002027146 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,000

F1 · shares: Grant of fully vested Restricted Stock Units (RSUs), each of which represents a right to receive one share of common stock of QMCO.

SEC source: 0000709283-24-000033 · wk-form4_1729545448.xml · nonDerivative · entry 1

Lerner James J · CIK 0001602567 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,923,658

F1 · shares: (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.

SEC source: 0000709283-24-000032 · wk-form4_1729545438.xml · nonDerivative · entry 1

Gianella Kenneth P. · CIK 0001677143 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 392,750

F1 · 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 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.

SEC source: 0000709283-24-000031 · wk-form4_1729545426.xml · nonDerivative · entry 1

Spanjaard Henk Jan · CIK 0002000334 · Chief Revenue Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 131,112

F1 · shares: (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.

SEC source: 0000709283-24-000030 · wk-form4_1729545416.xml · nonDerivative · entry 1

Cabrera Brian E · CIK 0001314901 · SVP Chief Admin Ofcr & Secy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 385,637

F1 · shares: (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.

SEC source: 0000709283-24-000029 · wk-form4_1729545403.xml · nonDerivative · entry 2

Jaworksi Don · CIK 0001947510 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 97,498

F2 · shares: Grant of 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, 2025 or the date of the Company's next annual stockholder meeting, subject to continued service on the Company's Board of Directors, 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.

SEC source: 0000709283-24-000029 · wk-form4_1729545403.xml · nonDerivative · entry 1

Jaworksi Don · CIK 0001947510 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 85,498

F1 · shares: Grant of fully vested Restricted Stock Units (RSUs), each of which represents a right to receive one share of common stock of QMCO.

SEC source: 0000709283-24-000028 · wk-form4_1729545394.xml · nonDerivative · entry 2

White Yue Zhou · CIK 0001875944 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 126,766

F2 · shares: Grant of 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, 2025 or the date of the Company's next annual stockholder meeting, subject to continued service on the Company's Board of Directors. 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.

SEC source: 0000709283-24-000028 · wk-form4_1729545394.xml · nonDerivative · entry 1

White Yue Zhou · CIK 0001875944 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 114,766

F1 · shares: Grant of fully vested Restricted Stock Units (RSUs), each of which represents a right to receive one share of common stock of QMCO.

SEC source: 0000709283-24-000027 · wk-form4_1729545382.xml · nonDerivative · entry 2

Meyrath Hugues · CIK 0001419111 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 97,498

F2 · shares: Grant of 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, 2025 or the date of the Company's next annual stockholder meeting, subject to continued service on the Company's Board of Directors, 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.