As Of	Filer	Filing¹	For·On·As	Docs:Size	Issuer		Filing Agent

 4/28/21  B. Riley Financial, Inc.          SC 13D/A               1:154K Quantum Corp./DE                  EdgarAgents LLC/FA       
          B. Riley Capital Management, LLC³
          B. Riley Securities, Inc.³
          BRC Partners Management GP, LLC³
          BRC Partners Opportunity Fund, L.P.³
          Bryant R. Riley³
  2/8/21  B. Riley Financial, Inc.          SC 13D/A               2:183K Quantum Corp./DE                  EdgarAgents LLC/FA       
          B. Riley Securities, Inc.³
          B.Riley Capital Management, LLC³
          BRC Partners Management GP, LLC³
          BRC Partners Opportunity Fund, L.P.³
          Bryant R. Riley³
 4/29/20‡ B. Riley Financial, Inc.          SC 13D/A    4/28/20    1:207K Quantum Corp./DE                  EdgarAgents LLC/FA       
          B. Riley Capital Management, LLC³
          B. Riley FBR, Inc.³
          BRC Partners Management GP, LLC³
          BRC Partners Opportunity Fund, L.P.³
  4/6/20  B. Riley Financial, Inc.          SC 13D                 2:180K Quantum Corp./DE                  EdgarAgents LLC/FA       
          B. Riley Capital Management, LLC³
          B. Riley FBR, Inc.³
          BRC Partners Management GP, LLC³
          BRC Partners Opportunity Fund, L.P.³
          Bryant R. Riley³
          Daniel Shribman³
          Robert D’Agostino³
          Robert L. Antin³
 1/28/20  B. Riley Financial, Inc.          SC 13G/A               1:133K Quantum Corp./DE                  EdgarAgents LLC/FA       
          B. Riley Capital Management, LLC³
          B. Riley FBR, Inc.³
          BR Dialectic Capital Management, LLC³
          BRC Partners Management GP, LLC³
          BRC Partners Opportunity Fund, LP³
          Dialectic Antithesis Partners, LP³
 1/28/19  B. Riley Financial, Inc.          SC 13G/A               1:213K Quantum Corp./DE                  S2 Filings LLC/FA        
          B. Riley Capital Management, LLC³
          B. Riley FBR, Inc.³
          BR Dialectic Capital Management, LLC³
          BRC Partners Management GP, LLC³
          BRC Partners Opportunity Fund, LP³
          Dialectic Antithesis Partners, LP³
12/31/18‡ B. Riley Financial, Inc.          SC 13G     12/28/18    1:136K Quantum Corp./DE                  S2 Filings LLC/FA        
          B. Riley Capital Management, LLC³
          B. Riley FBR, Inc.³
          BR Dialectic Capital Management, LLC³
          BRC Partners Management GP, LLC³
          BRC Partners Opportunity Fund, LP³
          Dialectic Antithesis Partners, LP³

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‡	A non-Insider-Ownership Filing that was accepted after the SEC “closed” at 5:30:00pm ET.  The legal “Filed As Of” date may be the next, or another, day.
¹	Filing/Form Types:
	SC 13D	Statement of Acquisition of Beneficial Ownership by an “Active” Investor — Schedule 13D.
	SC 13G	Statement of Acquisition of Beneficial Ownership by a “Passive” Investor — Schedule 13G.
	/A	Amendment to, or Amended version of, a previous Filing of this Type.
³	Group Member:  A Registrant or non-Registrant party to this Filing made by a Group.