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| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2013 | QUANTUM CORP /DE/ | QTM | 22,030,784 | 2,158,920 | 30,182,000 | 5,541,000 | $1.37 |
| 03/31/2013 | QUANTUM CORP /DE/ | QTM | 20,232,653 | 360,789 | 25,898,000 | 1,257,000 | $1.28 |
| 12/31/2012 | QUANTUM CORP /DE/ | QTM | 19,871,864 | -889,751 | 24,641,000 | -8,785,000 | $1.24 |
| 09/30/2012 | QUANTUM CORP /DE/ | QTM | 20,761,615 | -169,749 | 33,426,000 | -9,065,000 | $1.61 |
| 06/30/2012 | QUANTUM CORP /DE/ | QTM | 20,931,364 | 1,821,779 | 42,491,000 | -7,576,000 | $2.03 |
| 03/31/2012 | QUANTUM CORP /DE/ | QTM | 19,109,585 | -566,093 | 50,067,000 | 14,454,000 | $2.62 |
| 02/14/2012 | QUANTUM CORP /DE/ | QTM | 19,405,928 | -269,750 | 49,291,057 | 13,678,057 | $2.54 |
| 12/31/2011 | QUANTUM CORP /DE/ | QTM | 19,405,928 | -269,750 | 46,574,000 | 10,961,000 | $2.40 |
| 09/30/2011 | QUANTUM CORP /DE/ | QTM | 19,675,678 | 2,113,966 | 35,613,000 | -22,341,000 | $1.81 |
| 06/30/2011 | QUANTUM CORP /DE/ | QTM | 17,561,712 | -107,444 | 57,954,000 | 13,428,000 | $3.30 |
| 03/31/2011 | QUANTUM CORP /DE/ | QTM | 17,669,156 | -510,300 | 44,526,000 | -23,102,000 | $2.52 |
| 02/14/2011 | QUANTUM CORP /DE/ | QTM | 18,179,456 | 0 | 51,629,655 | -15,998,345 | $2.84 |
| 12/31/2010 | QUANTUM CORP /DE/ | QTM | 18,179,456 | -5,443,883 | 67,628,000 | 17,547,000 | $3.72 |
| 09/30/2010 | QUANTUM CORP /DE/ | QTM | 23,623,339 | 3,669,212 | 50,081,000 | 12,567,000 | $2.12 |
| 08/10/2010 | QUANTUM CORP /DE/ | QTM | 22,242,977 | 1,746,867 | 30,028,019 | -23,876,981 | $1.35 |
| 06/30/2010 | QUANTUM CORP /DE/ | QTM | 19,954,127 | -541,983 | 37,514,000 | -16,391,000 | $1.88 |
| 03/31/2010 | QUANTUM CORP /DE/ | QTM | 20,496,110 | -1,165,006 | 53,905,000 | -9,562,000 | $2.63 |
| 02/10/2010 | QUANTUM CORP /DE/ | QTM | 19,930,933 | -5,632,077 | 48,830,786 | 16,621,786 | $2.45 |
| 12/31/2009 | QUANTUM CORP /DE/ | QTM | 21,661,116 | -3,901,894 | 63,467,000 | 31,258,000 | $2.93 |
| 09/30/2009 | QUANTUM CORP /DE/ | QTM | 25,563,010 | 222,364 | 32,209,000 | 11,176,000 | $1.26 |
| 06/30/2009 | QUANTUM CORP /DE/ | QTM | 25,340,646 | -4,296,290 | 21,033,000 | 1,176,000 | $0.83 |
| 03/31/2009 | QUANTUM CORP /DE/ | QTM | 29,636,936 | -2,225,896 | 19,857,000 | 8,386,000 | $0.67 |
| 02/13/2009 | QUANTUM CORP /DE/ | QTM | 31,894,382 | 31,550 | 21,050,292 | 9,579,292 | $0.66 |
| 12/31/2008 | QUANTUM CORP /DE/ | QTM | 31,862,832 | -317,419 | 11,471,000 | -22,318,000 | $0.36 |
| 09/30/2008 | QUANTUM CORP /DE/ | QTM | 32,180,251 | -4,054,481 | 33,789,000 | -15,128,000 | $1.05 |
| 06/30/2008 | QUANTUM CORP /DE/ | QTM | 36,234,732 | -6,501,062 | 48,917,000 | -42,538,000 | $1.35 |
| 03/31/2008 | QUANTUM CORP /DE/ | QTM | 42,735,794 | 3,111,410 | 91,455,000 | -15,135,000 | $2.14 |
| 02/14/2008 | QUANTUM CORP /DE/ | QTM | 39,655,934 | 31,550 | 99,139,835 | -7,450,165 | $2.50 |
| 12/31/2007 | QUANTUM CORP /DE/ | QTM | 39,624,384 | -2,473,225 | 106,590,000 | -36,542,000 | $2.69 |
| 09/30/2007 | QUANTUM CORP /DE/ | QTM | 42,097,609 | 2,802,027 | 143,132,000 | 18,565,000 | $3.40 |
| 06/30/2007 | QUANTUM CORP /DE/ | QTM | 39,295,582 | 5,320,703 | 124,567,000 | 32,835,000 | $3.17 |
| 03/31/2007 | QUANTUM CORP /DE/ | QTM | 33,974,879 | -336,800 | 91,732,000 | 12,129,000 | $2.70 |
| 12/31/2006 | QUANTUM CORP /DE/ | QTM | 34,311,679 | -1,030,662 | 79,603,000 | 2,557,000 | $2.32 |
| 09/30/2006 | QUANTUM CORP /DE/ | QTM | 35,342,341 | -1,380,752 | 77,046,000 | -19,169,000 | $2.18 |
| 06/30/2006 | QUANTUM CORP /DE/ | QTM | 36,723,093 | -1,761,912 | 96,215,000 | -47,719,000 | $2.62 |
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