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DRIEHAUS CAPITAL MANAGEMENT LLC
> ARST
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2010 | ArcSight Inc | ARST | 475,152 | 389,192 | 11,437,000 | 9,017,000 | $24.07 |
| 03/31/2010 | ArcSight Inc | ARST | 85,960 | -294,061 | 2,420,000 | -7,301,000 | $28.15 |
| 12/31/2009 | ArcSight Inc | ARST | 380,021 | -95,131 | 9,721,000 | -1,716,000 | $25.58 |
| 09/30/2009 | ArcSight Inc | ARST | 475,152 | 57,645 | 11,437,000 | 4,018,000 | $24.07 |
| 06/30/2009 | ArcSight Inc | ARST | 417,507 | 67,331 | 7,419,000 | 2,947,000 | $17.77 |
| 03/31/2009 | ArcSight Inc | ARST | 350,176 | 350,176 | 4,472,000 | 4,472,000 | $12.77 |
| 12/31/2008 | ArcSight Inc | ARST | 207,809 | 124,163 | 1,665,000 | 1,027,000 | $8.01 |
| 09/30/2008 | ArcSight Inc | ARST | 83,646 | 83,646 | 638,000 | 638,000 | $7.63 |
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