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 OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
B. Riley Financial, Inc.
   2. Issuer Name and Ticker or Trading Symbol
QUANTUM CORP /DE/ [QMCO] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
11100 SANTA MONICA BLVD,, SUITE 800		 3. Date of Earliest Transaction (Month/Day/Year)
09/30/2021
(Street)

LOS ANGELES, CA 90025		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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               5,359,100 I By B. Riley Securities, Inc. (1) (2)
Common Stock               10,199 I By Bryant R. Riley, as UTMA custodian for Charlie Riley (1) (2)
Common Stock               10,200 I By Bryant R. Riley, as UTMA custodian for Susan Riley (1) (2)
Common Stock               10,199 I By Bryant R. Riley, as UTMA custodian for Abigail Riley (1) (2)
Common Stock               10,198 I By Bryant R. Riley, as UTMA custodian for Eloise Riley (1) (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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
(Month/Day/Year)		 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

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
B. Riley Financial, Inc.
11100 SANTA MONICA BLVD,
SUITE 800
LOS ANGELES, CA 90025		     X    
B. Riley Securities, Inc.
11100 SANTA MONICA BLVD,
SUITE 800
LOS ANGELES, CA 90025		     X    
RILEY BRYANT R
11100 SANTA MONICA BLVD,
SUITE 800
LOS ANGELES, CA 90025		     X    

Signatures

 B. Riley Financial, Inc., by: /s/ Bryant R. Riley, Co-Chief Executive Officer   10/29/2021
**Signature of Reporting Person Date
 B. Riley Securities, Inc., by: /s/ Andrew Moore, Chief Executive Officer   10/29/2021
**Signature of Reporting Person Date
 Bryant R. Riley, by: /s/ Bryant R. Riley   10/29/2021
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) This Form 4 is being filed jointly by B. Riley Financial, Inc., a Delaware corporation ("BRF"), B. Riley Securities, Inc., a Delaware corporation ("BRS"), and Bryant R. Riley. BRF is the parent company of BRS. As a result, BRF may be deemed to indirectly beneficially own the shares held by BRS.
(2) Bryant R. Riley is the Co-Chief Executive Officer and Chairman of the Board of Directors of BRF. As a result, Bryant R. Riley may be deemed to indirectly beneficially own the shares of Common Stock directly held by BRF, and BRS. Each of BRF, BRS, and Bryant R. Riley disclaims beneficial ownership of the outstanding shares of Common Stock reported herein, except to the extent of its/his respective pecuniary interest therein.
 
Remarks:
As of September 30, 2021, by virtue of the removal of any trading and voting power authority in any capacity of BRF, B. Riley Capital Management, LLC, a New York limited liability company, a registered investment advisor ("BRCM"), and Bryant R. Riley over the assets of BRC Partners Opportunity Fund, LP, a Delaware limited partnership ("BRPLP"), BRF, BRCM and Bryant R. Riley no longer may be deemed to beneficially own the shares held by BRPLP.

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