Sec Form 4 Filing - Moorehead Lewis W. @ QUANTUM CORP /DE/ - 2021-05-11

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Moorehead Lewis W. 2. Issuer Name and Ticker or Trading Symbol QUANTUM CORP /DE/ [ QMCO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Accounting Officer (Last) (First) (Middle) C/O QUANTUM CORPORATION, 224 AIRPORT PARKWAY SUITE 550 3. Date of Earliest Transaction (MM/DD/YY) 05/11/2021 (Street) SAN JOSE, CA95110 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock ( 1 ) ( 2 ) 05/11/2021 M 22,875 A $ 0 191,107 D Common Stock ( 3 ) 05/11/2021 A 13,750 A $ 0 204,857 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Performance-Based Restricted Stock Units ( 1 ) 05/11/2021 M 16,000 ( 1 ) 09/06/2029 Common Stock 16,000 $ 0 0 D Performance-Based Restricted Stock Units ( 2 ) 05/11/2021 A 6,875 ( 2 ) 07/01/2025 Common Stock 6,875 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Moorehead Lewis W. C/O QUANTUM CORPORATION 224 AIRPORT PARKWAY SUITE 550 SAN JOSE, CA95110 Chief Accounting Officer Signatures /s/ Josie Buensuceso, Attorney-in-Fact for Elizabeth King 05/19/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Performance-Based Restricted Stock Units were previously reported on September 10, 2019, which vest in three equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The third achievement date occurred on May 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 16,000 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on September 5, 2022, subject to continued employment. These shares are reflected on Table I, and no units remain that are subject to these performance-based and time-based vesting conditions. ( 2 )Performance-Based Restricted Stock Units were previously reported on July 2, 2020, which vest in two equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The second achievement date occurred on May 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 6,875 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on July 1, 2023, subject to continued employment. These shares are reflected on Table I, and no units remain subject to these performance-based and time-based vesting conditions. ( 3 )Grant of Performance-Based Restricted Stock Units ("PSUs"), each of which represents a contingent right to receive one share of common stock of QMCO, acquired with vesting subject to the achievement of specified performance-based conditions, occurred on May 11, 2021 as certified by the leadership and compensation committee of QMCO, resulting in 13,750 units for the Free Cash Flow results based on the Company's performance as of March 31, 2021 (end of the QMCO's Fiscal 2021 Year). 100% of PSUs are earned as 100% of the free cash flow target performance goal is achieved. However, these shares remain subject to time-based vesting conditions and will therefore vest in equal installments with 1/3rd July 1, 2021, 1/3rd July 1, 2022 and 1/3rd July 1, 2023, subject to continued employment.

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