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STERLING JOHNSTON CAPITAL MANAGEMENT LP
> OYOG
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2010 | GEOSPACE TECHNOLOGIES CORP | OYOG | 0 | -8,700 | 0 | -504,000 | |
| 09/30/2010 | GEOSPACE TECHNOLOGIES CORP | OYOG | 8,700 | 1,250 | 504,000 | 143,000 | $57.93 |
| 06/30/2010 | GEOSPACE TECHNOLOGIES CORP | OYOG | 7,450 | -8,450 | 361,000 | -399,000 | $48.46 |
| 03/31/2010 | GEOSPACE TECHNOLOGIES CORP | OYOG | 15,900 | -7,000 | 760,000 | -222,000 | $47.80 |
| 12/31/2009 | GEOSPACE TECHNOLOGIES CORP | OYOG | 22,900 | -39,400 | 982,000 | -627,000 | $42.88 |
| 09/30/2009 | GEOSPACE TECHNOLOGIES CORP | OYOG | 62,300 | -2,650 | 1,609,000 | -58,000 | $25.83 |
| 06/30/2009 | GEOSPACE TECHNOLOGIES CORP | OYOG | 64,950 | 750 | 1,667,000 | 829,000 | $25.67 |
| 03/31/2009 | GEOSPACE TECHNOLOGIES CORP | OYOG | 64,200 | -36,000 | 838,000 | -912,000 | $13.05 |
| 12/31/2008 | GEOSPACE TECHNOLOGIES CORP | OYOG | 100,200 | -59,250 | 1,750,000 | -4,513,000 | $17.47 |
| 09/30/2008 | GEOSPACE TECHNOLOGIES CORP | OYOG | 159,450 | 14,600 | 6,263,000 | -2,274,000 | $39.28 |
| 06/30/2008 | GEOSPACE TECHNOLOGIES CORP | OYOG | 144,850 | -19,350 | 8,537,000 | 1,079,000 | $58.94 |
| 03/31/2008 | GEOSPACE TECHNOLOGIES CORP | OYOG | 164,200 | 90,300 | 7,458,000 | 1,889,000 | $45.42 |
| 12/31/2007 | GEOSPACE TECHNOLOGIES CORP | OYOG | 73,900 | -400 | 5,569,000 | -1,319,000 | $75.36 |
| 09/30/2007 | GEOSPACE TECHNOLOGIES CORP | OYOG | 74,300 | 10,050 | 6,888,000 | 2,121,000 | $92.71 |
| 06/30/2007 | GEOSPACE TECHNOLOGIES CORP | OYOG | 64,250 | 64,250 | 4,767,000 | 4,767,000 | $74.19 |
| 12/31/2006 | GEOSPACE TECHNOLOGIES CORP | OYOG | 0 | -62,100 | 0 | -3,524,000 | |
| 09/30/2006 | GEOSPACE TECHNOLOGIES CORP | OYOG | 62,100 | 62,100 | 3,524,000 | 3,524,000 | $56.75 |
| 06/30/2006 | GEOSPACE TECHNOLOGIES CORP | OYOG | 0 | -17,900 | 0 | -1,056,000 | |
| 03/31/2006 | GEOSPACE TECHNOLOGIES CORP | OYOG | 17,900 | 17,900 | 1,056,000 | 1,056,000 | $58.99 |
| 12/31/2005 | GEOSPACE TECHNOLOGIES CORP | OYOG | 0 | -17,500 | 0 | -347,000 | |
| 09/30/2005 | GEOSPACE TECHNOLOGIES CORP | OYOG | 17,500 | 17,500 | 347,000 | 347,000 | $19.83 |
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