| SC 13G | 2008-03-28 | TENNENBAUM CAPITAL PARTNERS LLC | QUANTUM CORP /DE/ | 11,659,770 | 5.4% | EDGAR |
| SC 13G/A | 2008-02-14 | Clearbridge Advisors, LLC | QUANTUM CORP /DE/ | 12,915,213 | 6.3% | EDGAR |
| SC 13G/A | 2008-02-14 | PRIVATE CAPITAL MANAGEMENT | QUANTUM CORP /DE/ | 194 | 19.4% | EDGAR |
| SC 13G/A | 2008-02-14 | NWQ INVESTMENT MANAGEMENT CO LLC | QUANTUM CORP /DE/ | 28,962,914 | 14.2% | EDGAR |
| SC 13G/A | 2008-02-14 | ELM RIDGE CAPITAL MANAGEMENT LLC | QUANTUM CORP /DE/ | 0 | 0.0% | EDGAR |
| SC 13G/A | 2008-02-14 | NORDEA NORTH AMERICAN VALUE FUND | QUANTUM CORP /DE/ | 11,892,100 | 5.8% | EDGAR |
| SC 13G | 2008-02-14 | Silver Point Capital L.P. | QUANTUM CORP /DE/ | - | - | EDGAR |
| SC 13G/A | 2008-01-24 | Noonday Asset Management, L.P. | QUANTUM CORP /DE/ | 12,100,876 | 5.8% | EDGAR |
| SC 13G | 2007-08-16 | Silver Point Capital L.P. | QUANTUM CORP /DE/ | 10,250,000 | 5.1% | EDGAR |
| SC 13G | 2007-07-27 | NORDEA NORTH AMERICAN VALUE FUND | QUANTUM CORP /DE/ | 10,134,600 | 5.1% | EDGAR |
| SC 13G/A | 2007-02-14 | PRIVATE CAPITAL MANAGEMENT | QUANTUM CORP /DE/ | 177 | 17.7% | EDGAR |
| SC 13G/A | 2007-02-14 | NWQ INVESTMENT MANAGEMENT CO LLC | QUANTUM CORP /DE/ | 37,231,420 | 18.5% | EDGAR |
| SC 13G/A | 2007-02-13 | ELM RIDGE CAPITAL MANAGEMENT LLC | QUANTUM CORP /DE/ | 10,376,830 | 5.4% | EDGAR |
| SC 13G/A | 2007-02-08 | Clearbridge Advisors, LLC | QUANTUM CORP /DE/ | 14,296,210 | 7.4% | EDGAR |
| SC 13G/A | 2007-01-24 | Noonday Asset Management, L.P. | QUANTUM CORP /DE/ | 9 | 11.0% | EDGAR |
| SC 13G/A | 2006-05-24 | NWQ INVESTMENT MANAGEMENT CO LLC | QUANTUM CORP /DE/ | 32,718,524 | 17.4% | EDGAR |
| SC 13D | 2006-05-12 | QUANTUM CORP /DE/ | ADVANCED DIGITAL INFORMATION CORP | 5,406,776 | 8.7% | EDGAR |
| SC 13G | 2006-03-16 | Noonday Asset Management, L.P. | QUANTUM CORP /DE/ | 9 | 11.0% | EDGAR |
| SC 13G | 2006-02-15 | CAM North America, LLC | QUANTUM CORP /DE/ | 9,522,949 | 5.1% | EDGAR |
| SC 13G/A | 2006-02-14 | PRIVATE CAPITAL MANAGEMENT | QUANTUM CORP /DE/ | 39,949,569 | 1.0% | EDGAR |