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Filing Details

Accession Number:: 0000921895-16-006278
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2016-12-05 19:00:08
Reporting Period:: 2016-12-01

Filing Date:: 2016-12-05
Accepted Time:: 2016-12-05 19:00:08
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
1373638	Ltd Fund Master Opportunity & Value Starboard	777 Third Avenue 18Th Floor New York NY 10017	No	No	Yes	No
1517137	Starboard Value Lp	777 Third Avenue 18Th Floor New York NY 10017	No	No	Yes	No
1517138	Starboard Value Gp Llc	777 Third Avenue 18Th Floor New York NY 10017	No	No	Yes	No
1517139	Starboard Principal Co Lp	777 Third Avenue 18Th Floor New York NY 10017	No	No	Yes	No
1517140	Starboard Principal Co Gp Llc	777 Third Avenue 18Th Floor New York NY 10017	No	No	Yes	No
1519812	Starboard Value & Opportunity S Llc	777 Third Avenue 18Th Floor New York NY 10017	No	No	Yes	No
1571704	Starboard Value & Opportunity C Lp	777 Third Avenue 18Th Floor New York NY 10017	No	No	Yes	No
1575972	Starboard Value R Lp	777 Third Avenue 18Th Floor New York NY 10017	No	No	Yes	No
1575979	Starboard Value R Gp Llc	777 Third Avenue 18Th Floor New York NY 10017	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	Disposition	2016-12-01	568,864	$0.92	10,221,933	No	4	S	Indirect	By Starboard Value and Opportunity Master Fund Ltd
Common Stock, $0.01 Par Value	Disposition	2016-12-01	127,512	$0.92	2,291,250	No	4	S	Indirect	By Starboard Value and Opportunity S LLC
Common Stock, $0.01 Par Value	Disposition	2016-12-01	104,106	$0.92	1,870,677	No	4	S	Indirect	By Starboard Value and Opportunity C LP
Common Stock, $0.01 Par Value	Disposition	2016-12-01	199,518	$0.92	3,585,136	No	4	S	Indirect	By Managed Account of Starboard Value LP
Common Stock, $0.01 Par Value	Disposition	2016-12-05	1,479,049	$0.92	8,742,884	No	4	S	Indirect	By Starboard Value and Opportunity Master Fund Ltd
Common Stock, $0.01 Par Value	Disposition	2016-12-05	331,530	$0.92	1,959,720	No	4	S	Indirect	By Starboard Value and Opportunity S LLC
Common Stock, $0.01 Par Value	Disposition	2016-12-05	270,675	$0.92	1,600,002	No	4	S	Indirect	By Starboard Value and Opportunity C LP
Common Stock, $0.01 Par Value	Disposition	2016-12-05	518,746	$0.92	3,066,390	No	4	S	Indirect	By Managed Account of Starboard Value LP

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	By Starboard Value and Opportunity Master Fund Ltd
No	4	S	Indirect	By Starboard Value and Opportunity S LLC
No	4	S	Indirect	By Starboard Value and Opportunity C LP
No	4	S	Indirect	By Managed Account of Starboard Value LP
No	4	S	Indirect	By Starboard Value and Opportunity Master Fund Ltd
No	4	S	Indirect	By Starboard Value and Opportunity S LLC
No	4	S	Indirect	By Starboard Value and Opportunity C LP
No	4	S	Indirect	By Managed Account of Starboard Value 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 S 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"), Starboard Value R LP ("Starboard R LP"), Starboard Value R GP LLC ("Starboard R GP"), Jeffrey C. Smith, Mark R. Mitchell and Peter A. Feld (collectively, the "Reporting Persons"). To enable all of the Reporting Persons to gain access to the Securities and Exchange Commission's electronic filing system (which only accepts a maximum of 10 joint filers per report), this report is the first of two identical reports relating to the same transactions being filed with the Securities and Exchange Commission.
Each Reporting Person may be deemed to be a member of a Section 13(d) group that owns 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 V&O Fund. Starboard Value LP, as the investment manager of Starboard V&O Fund, may be deemed to be the beneficial owner of the shares of Common Stock beneficially owned by Starboard V&O Fund. 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 V&O Fund.
Shares of Common Stock beneficially owned by Starboard S LLC. Starboard Value LP, as the manager of Starboard S LLC, may be deemed to be the beneficial owner of the shares of Common Stock beneficially owned by Starboard S LLC. 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 S LLC.
Shares of Common Stock beneficially owned by Starboard C LP. Each of Starboard R LP, as the general partner of Starboard C LP, and Starboard R GP, as the general partner of Starboard R LP, may be deemed to be the beneficial owner of the 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.
Shares held in an account managed by Starboard Value LP. 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 Value LP.