<SEC-DOCUMENT>0000921895-15-002872-index.html : 20151228
<SEC-HEADER>0000921895-15-002872.hdr.sgml : 20151225
<ACCEPTANCE-DATETIME>20151228160516
ACCESSION NUMBER:		0000921895-15-002872
CONFORMED SUBMISSION TYPE:	SC 13D
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20151228
DATE AS OF CHANGE:		20151228

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			QUANTUM CORP /DE/
		CENTRAL INDEX KEY:			0000709283
		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER STORAGE DEVICES [3572]
		IRS NUMBER:				942665054
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0331

	FILING VALUES:
		FORM TYPE:		SC 13D
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-35818
		FILM NUMBER:		151309448

	BUSINESS ADDRESS:	
		STREET 1:		224 AIRPORT PARKWAY
		STREET 2:		SUITE 300
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95110
		BUSINESS PHONE:		408 944 4000

	MAIL ADDRESS:	
		STREET 1:		224 AIRPORT PARKWAY
		STREET 2:		SUITE 300
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95110

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			VIEX Special Opportunities Fund III, LP
		CENTRAL INDEX KEY:			0001619126
		IRS NUMBER:				471679732
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D

	BUSINESS ADDRESS:	
		STREET 1:		825 THIRD AVENUE
		STREET 2:		33RD FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		212-752-5750

	MAIL ADDRESS:	
		STREET 1:		825 THIRD AVENUE
		STREET 2:		33RD FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Vertex Special Opportunities Fund III, LP
		DATE OF NAME CHANGE:	20140910
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D
<SEQUENCE>1
<FILENAME>sc13d10114qua_12282015.htm
<DESCRIPTION>SCHEDULE 13D
<TEXT>
Document 1 - file: sc13d10114qua_12282015.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>ex991to13d10114qua_12282015.htm
<DESCRIPTION>JOINT FILING AGREEMENT
<TEXT>
Document 2 - file: ex991to13d10114qua_12282015.htm

</DOCUMENT>
</SEC-DOCUMENT>