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Form 4 - Statement of changes in beneficial ownership of securities:
SEC Accession No. 0001415889-15-003396
Filing Date
2015-10-13
Accepted
2015-10-13 21:47:50
Documents
1
Period of Report
2015-10-09

Document Format Files

Seq Description Document Type Size
1 OWNERSHIP DOCUMENT form406297109a_10132015.html 4  
1 OWNERSHIP DOCUMENT form406297109a_10132015.xml 4 26143
  Complete submission text file 0001415889-15-003396.txt   31955
Mailing Address 224 AIRPORT PARKWAY SUITE 300 SAN JOSE CA 95110
Business Address 224 AIRPORT PARKWAY SUITE 300 SAN JOSE CA 95110 408 944 4000
QUANTUM CORP /DE/ (Issuer) CIK: 0000709283 (see all company filings)

IRS No.: 942665054 | State of Incorp.: DE | Fiscal Year End: 0331
SIC: 3572 Computer Storage Devices

Mailing Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017
Business Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017 212-845-7906
STARBOARD VALUE & OPPORTUNITY MASTER FUND LTD (Reporting) CIK: 0001373638 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-13449 | Film No.: 151157091

Mailing Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017
Business Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017 (212) 845-7977
Starboard Value LP (Reporting) CIK: 0001517137 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-13449 | Film No.: 151157094

Mailing Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017
Business Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017 (212) 845-7977
Starboard Value GP LLC (Reporting) CIK: 0001517138 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-13449 | Film No.: 151157093

Mailing Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017
Business Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017 (212) 845-7977
Starboard Principal Co LP (Reporting) CIK: 0001517139 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-13449 | Film No.: 151157087

Mailing Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017
Business Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017 (212) 845-7977
Starboard Principal Co GP LLC (Reporting) CIK: 0001517140 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-13449 | Film No.: 151157086

Mailing Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017
Business Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017 212-845-7977
STARBOARD VALUE & OPPORTUNITY S LLC (Reporting) CIK: 0001519812 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 4 | Act: 34 | File No.: 001-13449 | Film No.: 151157092

Mailing Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017
Business Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017 (212) 845-7977
Starboard Value & Opportunity C LP (Reporting) CIK: 0001571704 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-13449 | Film No.: 151157090

Mailing Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017
Business Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017 (212)845-7977
Starboard Value R LP (Reporting) CIK: 0001575972 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-13449 | Film No.: 151157089

Mailing Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017
Business Address 777 THIRD AVENUE, 18TH FLOOR NEW YORK NY 10017 (212) 845-7977
Starboard Value R GP LLC (Reporting) CIK: 0001575979 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-13449 | Film No.: 151157088