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RENAISSANCE TECHNOLOGIES LLC
> ARBX
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 03/31/2010 | ARBINET Corp | ARBX | 951,500 | 12,500 | 1,938,000 | -400,000 | $2.04 |
| 12/31/2009 | ARBINET Corp | ARBX | 939,000 | 4,800 | 2,338,000 | 143,000 | $2.49 |
| 09/30/2009 | ARBINET Corp | ARBX | 934,200 | 700 | 2,195,000 | 571,000 | $2.35 |
| 06/30/2009 | ARBINET Corp | ARBX | 933,500 | -13,200 | 1,624,000 | 109,000 | $1.74 |
| 03/31/2009 | ARBINET Corp | ARBX | 946,700 | -10,600 | 1,515,000 | 79,000 | $1.60 |
| 12/31/2008 | ARBINET Corp | ARBX | 957,300 | 957,300 | 1,436,000 | 1,436,000 | $1.50 |
| 09/30/2008 | ARBINET Corp | ARBX | 950,200 | 34,400 | 2,594,000 | -959,000 | $2.73 |
| 06/30/2008 | ARBINET Corp | ARBX | 915,800 | 40,000 | 3,553,000 | -108,000 | $3.88 |
| 03/31/2008 | ARBINET Corp | ARBX | 875,800 | 71,800 | 3,661,000 | -1,203,000 | $4.18 |
| 12/31/2007 | ARBINET Corp | ARBX | 804,000 | 47,300 | 4,864,000 | 324,000 | $6.05 |
| 09/30/2007 | ARBINET Corp | ARBX | 756,700 | 130,800 | 4,540,000 | 766,000 | $6.00 |
| 06/30/2007 | ARBINET Corp | ARBX | 625,900 | 97,900 | 3,774,000 | 437,000 | $6.03 |
| 03/31/2007 | ARBINET Corp | ARBX | 528,000 | 73,439 | 3,337,000 | 841,000 | $6.32 |
| 12/31/2006 | ARBINET Corp | ARBX | 454,561 | 454,561 | 2,496,000 | 2,496,000 | $5.49 |
| 09/30/2006 | ARBINET Corp | ARBX | 329,061 | 93,800 | 1,718,000 | 398,000 | $5.22 |
| 06/30/2006 | ARBINET Corp | ARBX | 235,261 | 89,500 | 1,320,000 | 247,000 | $5.61 |
| 03/31/2006 | ARBINET Corp | ARBX | 145,761 | 74,500 | 1,073,000 | 573,000 | $7.36 |
| 12/31/2005 | ARBINET Corp | ARBX | 71,261 | 71,261 | 500,000 | 500,000 | $7.02 |
| 09/30/2005 | ARBINET Corp | ARBX | 0 | -39,032 | 0 | -262,000 | |
| 06/30/2005 | ARBINET Corp | ARBX | 39,032 | 39,032 | 262,000 | 262,000 | $6.71 |
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