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Filing Details

Accession Number:: 0000921895-13-000739
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2013-04-03 21:34:20
Reporting Period:: 2013-04-01

Filing Date:: 2013-04-03
Accepted Time:: 2013-04-03 21:34:20
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
709283	Quantum Corp	QTM	Computer Storage Devices (3572)	942665054

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1285596	R Mark Mitchell	C/O Starboard Value Lp 830 Third Avenue, 3Rd Floor New York NY 10022	No	No	Yes	No
1362697	C Jeffrey Smith	C/O Starboard Value Lp 830 Third Avenue, 3Rd Floor New York NY 10022	No	No	Yes	No
1373638	Ltd Fund Master Opportunity & Value Starboard	830 Third Avenue, 3Rd Floor New York NY 10022	No	No	Yes	No
1410600	A Peter Feld	C/O Starboard Value Lp 830 Third Avenue, 3Rd Floor New York NY 10022	No	No	Yes	No
1517137	Starboard Value Lp	830 Third Avenue, 3Rd Floor New York NY 10022	No	No	Yes	No
1517138	Starboard Value Gp Llc	830 Third Avenue, 3Rd Floor New York NY 10022	No	No	Yes	No
1517139	Starboard Principal Co Lp	830 Third Avenue, 3Rd Floor New York NY 10022	No	No	Yes	No
1517140	Starboard Principal Co Gp Llc	830 Third Avenue, 3Rd Floor New York NY 10022	No	No	Yes	No
1519812	Starboard Value & Opportunity S Llc	830 Third Avenue, 3Rd Floor New York NY 10022	No	No	Yes	No
1571704	Starboard Value & Opportunity C Lp	830 Third Avenue 3Rd Floor New York NY 10022	No	No	Yes	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, $0.01 Par Value	Acquisiton	2013-04-01	500,000	$1.25	1,500,000	No	4	P	Indirect	By Starboard Value and Opportunity C LP
Common Stock, $0.01 Par Value	Acquisiton	2013-04-02	500,000	$1.25	2,000,000	No	4	P	Indirect	By Starboard Value and Opportunity C LP
Common Stock, $0.01 Par Value	Acquisiton	2013-04-02	125,000	$1.23	2,125,000	No	4	P	Indirect	By Starboard Value and Opportunity C LP
Common Stock, $0.01 Par Value	Acquisiton	2013-04-03	300,000	$1.23	2,425,000	No	4	P	Indirect	By Starboard Value and Opportunity C LP

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By Starboard Value and Opportunity C LP
No	4	P	Indirect	By Starboard Value and Opportunity C LP
No	4	P	Indirect	By Starboard Value and Opportunity C LP
No	4	P	Indirect	By Starboard Value and Opportunity C LP

Footnotes

This Form 4 is filed jointly by Starboard Value and Opportunity Master Fund Ltd ("Starboard V&O Fund"), Starboard Value and Opportunity S LLC ("Starboard LLC"), Starboard Value and Opportunity C LP ("Starboard C LP"), Starboard Value LP ("Starboard Value LP"), Starboard Value GP LLC ("Starboard Value GP"), Starboard Principal Co LP ("Principal Co"), Starboard Principal Co GP LLC ("Principal GP"), Jeffrey C. Smith, Mark Mitchell and Peter A. Feld (collectively, the "Reporting Persons").
Each Reporting Person is a member of a reporting group that owns in the aggregate more than 10% of the Issuer's outstanding shares of Common Stock. As such, each Reporting Person may be deemed to beneficially own more than 10% of the Issuer's outstanding shares of Common Stock .Each Reporting Person disclaims beneficial ownership of the shares of Common Stock reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such shares of Common Stock for purposes of Section 16 or for any other purpose.
Shares of Common Stock beneficially owned by Starboard C LP. Starboard Value LP, as the investment manager of Starboard C LP, may be deemed to be the beneficial owner of the shares of Common Stock beneficially owned by Starboard C LP. Each of Starboard Value GP, as the general partner of Starboard Value LP, Principal Co, as a member of Starboard Value GP, Principal GP, as the general partner of Principal Co and Messrs. Smith, Mitchell and Feld, as members of Principal GP and as members of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP, may be deemed to be the beneficial owner of the shares of Common Stock beneficially owned by Starboard C LP.