SEC Form 4

FORM 4		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 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* B. Riley Financial, Inc. (Last) (First) (Middle) 21255 BURBANK BOULEVARD, SUITE 400 (Street) WOODLAND HILLS, CA 91367 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol QUANTUM CORP /DE/ [ QTM ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 12/27/2018
	4. If Amendment, Date of 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

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	12/27/2018		P		38,092	A	$1.4908	938,092	I	See notes(1)(2)(3)
Common Stock	12/27/2018		P		253,801	A	$1.2469	1,493,801	I	See notes(1)(2)(4)
Common Stock	12/27/2018		P		100,000	A	$1.2	1,537,696	I	See notes(1)(2)(5)
Common Stock	12/28/2018		P		125,000	A	$1.9058(6)	1,662,696	I	See notes(1)(2)(5)

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 Securities Underlying Derivative Security (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: 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

1. Name and Address of Reporting Person* B. Riley Financial, Inc. (Last) (First) (Middle) 21255 BURBANK BOULEVARD, SUITE 400 (Street) WOODLAND HILLS, CA 91367 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BRC Partners Opportunity Fund, LP (Last) (First) (Middle) 11100 SANTA MONICA BLVD., SUITE 800 (Street) LOS ANGELES, CA 90025 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BRC Partners Management GP, LLC (Last) (First) (Middle) 11100 SANTA MONICA BLVD., SUITE 800 (Street) LOS ANGELES, CA 90025 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* B. RILEY CAPITAL MANAGEMENT, LLC (Last) (First) (Middle) 11100 SANTA MONICA BLVD., SUITE 800 (Street) LOS ANGELES, CA 90025 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* B. RILEY FBR, INC. (Last) (First) (Middle) 11100 SANTA MONICA BLVD., SUITE 800 (Street) LOS ANGELES, CA 90025 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Dialectic Antithesis Partners, LP (Last) (First) (Middle) 119 ROWAYTON AVENUE, 2ND FLOOR (Street) NORWALK, CT 06853 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BR Dialectic Capital Management, LLC (Last) (First) (Middle) 119 ROWAYTON AVENUE, 2ND FLOOR (Street) NORWALK, CT 06853 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. In addition to B. Riley Financial, Inc., a Delaware corporation ("BRF"), this Form 3 is being filed jointly by BRC Partners Opportunity Fund, L.P., a Delaware limited partnership ("BRPLP"), B. Riley Capital Management, LLC, a New York limited liability company ("BRCM"), BRC Partners Management GP, LLC, a Delaware limited liability company ("BRPGP"), B. Riley FBR, Inc., a Delaware corporation ("BRFBR"), Dialectic Antithesis Partners, LP, a Delaware limited partnership ("Dialectic") and BR Dialectic Capital Management, LLC, a Delaware limited liability company (collectively, the "Filing Persons").

2. BRPGP is the general partner of BRPLP, BRCM is an investment advisor to BRPLP and BRF is the parent company of BRCM. As a result, BRPGP, BRCM and BRF may be deemed to indirectly beneficially own the Shares held by BRPLP. BRF is the parent company of BRFBR. As a result, BRF may be deemed to indirectly beneficially own the Shares held by BRFBR. BR Dialectic is the general partner and investment manager of Dialectic. BRCM is the parent company of BR Dialectic and BRF is the parent company of BRCM. As a result, BR Dialectic, BRCM and BRF may be deemed to indirectly beneficially own the Shares held by Dialectic. Each of the Filing Persons disclaims beneficial ownership of the outstanding shares of Common Stock ("Common Stock"), of Quantum Corporation, a Delaware corporation (the "Issuer"), reported herein except to the extent of its pecuniary interest therein.

3. Represents shares of Common Stock owned directly by Dialectic.

4. Represents shares of Common Stock owned directly by BRPLP.

5. Represents shares of Common Stock owned directly by BRFBR.

6. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.875 to $1.92, inclusive. The Filing Persons reporting person undertakes to provide to the Commission, upon request, full information regarding the number of shares sold at each separate price.

Remarks:

Each of the Filing Persons may be deemed to beneficially own the securities of the Issuer owned by the other Filing Persons. The filing of this Form 4 shall not be deemed an admission that the Filing Persons are the beneficial owners of any securities of the Issuer it does not directly own. Each of the Filing Persons specifically disclaims beneficial ownership of the securities reported herein that it does not directly own.

	B. Riley Financial, Inc., by: /s/ Bryant R. Riley, Co-Chief Executive Officer	12/28/2018
	BRC Partners Opportunity Fund, L.P., by: /s/ Bryant R. Riley, Chief Investment Officer	12/28/2018
	BRC Partners Management GP, LLC, by B. Riley Capital Management, LLC, its sole member, by: /s/ Bryant R. Riley, Chief Executive Officer	12/28/2018
	B. Riley Capital Management, LLC, by: /s/ Bryant R. Riley, Chief Executive Officer	12/28/2018
	B. Riley FBR, Inc., by: /s/ Andy Moore, Chief Executive Officer	12/28/2018
	Dialectic Antithesis Partners, LP, by: /s/ John Fichthorn, Portfolio Manager	12/28/2018
	BR Dialectic Capital Management, LLC, by B. Riley Capital Management, LLC, its sole member, by: /s/ Bryant R. Riley, Chief Executive Officer	12/28/2018
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
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