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Form 3 - Initial statement of beneficial ownership of securities:
SEC Accession No. 0001521536-12-001046
Filing Date
2012-11-01
Accepted
2012-11-01 21:41:01
Documents
1
Period of Report
2012-10-26

Document Format Files

Seq Description Document Type Size
1 OWNERSHIP DOCUMENT form306297109_11012012.html 3  
1 OWNERSHIP DOCUMENT form306297109_11012012.xml 3 21038
  Complete submission text file 0001521536-12-001046.txt   26499
Mailing Address 1650 TECHNOLOGY DRIVE SUITE 700 SAN JOSE CA 95110
Business Address 1650 TECHNOLOGY DRIVE SUITE 700 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 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022
Business Address
MITCHELL MARK R (Reporting) CIK: 0001285596 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-13449 | Film No.: 121174958

Mailing Address C/O STARBOARD VALUE LP 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022
Business Address
Smith Jeffrey C (Reporting) CIK: 0001362697 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-13449 | Film No.: 121174964

Mailing Address C/O STARBOARD VALUE LP 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022
Business Address C/O STARBOARD VALUE LP 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022 212-845-7906
STARBOARD VALUE & OPPORTUNITY MASTER FUND LTD (Reporting) CIK: 0001373638 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-13449 | Film No.: 121174956

Mailing Address RAMIUS CAPITAL GROUP 599 LEXINGTON AVE., 21ST FLOOR NEW YORK NY 10022
Business Address
Feld Peter A (Reporting) CIK: 0001410600 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-13449 | Film No.: 121174957

Mailing Address 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022
Business Address 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022 (212) 845-7977
Starboard Value LP (Reporting) CIK: 0001517137 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-13449 | Film No.: 121174963

Mailing Address 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022
Business Address 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022 (212) 845-7977
Starboard Value GP LLC (Reporting) CIK: 0001517138 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-13449 | Film No.: 121174962

Mailing Address 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022
Business Address 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022 (212) 845-7977
Starboard Principal Co LP (Reporting) CIK: 0001517139 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-13449 | Film No.: 121174961

Mailing Address 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022
Business Address 830 THIRD AVENUE, 3RD FLOOR NEW YORK NY 10022 (212) 845-7977
Starboard Principal Co GP LLC (Reporting) CIK: 0001517140 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-13449 | Film No.: 121174960

Mailing Address 599 LEXINGTON AVENUE NEW YORK NY 10022
Business Address 599 LEXINGTON AVENUE NEW YORK NY 10022 212-845-7977
STARBOARD VALUE & OPPORTUNITY S LLC (Reporting) CIK: 0001519812 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-13449 | Film No.: 121174959