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MERRILL LYNCH & CO., INC.
> PTEN
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 09/30/2009 | PATTERSON UTI ENERGY INC | PTEN | 11,905 | -886,570 | 180,000 | -11,374,000 | $15.12 |
| 06/30/2009 | PATTERSON UTI ENERGY INC | PTEN | 898,475 | 194,660 | 11,554,000 | 3,452,000 | $12.86 |
| 03/31/2009 | PATTERSON UTI ENERGY INC | PTEN | 702,751 | -1,064 | 6,298,000 | -1,804,000 | $8.96 |
| 12/31/2008 | PATTERSON UTI ENERGY INC | PTEN | 703,815 | -11,506 | 8,102,000 | -6,218,000 | $11.51 |
| 09/30/2008 | PATTERSON UTI ENERGY INC | PTEN | 715,321 | 715,321 | 14,320,000 | 14,320,000 | $20.02 |
| 06/30/2008 | PATTERSON UTI ENERGY INC | PTEN | 1,036,657 | 7,777 | 37,455,000 | 10,518,000 | $36.13 |
| 03/31/2008 | PATTERSON UTI ENERGY INC | PTEN | 1,028,880 | 52,470 | 26,937,000 | 7,878,000 | $26.18 |
| 12/31/2007 | PATTERSON UTI ENERGY INC | PTEN | 976,410 | 950,293 | 19,059,000 | 18,470,000 | $19.52 |
| 09/28/2007 | PATTERSON UTI ENERGY INC | PTEN | 26,117 | -6,131 | 589,000 | -256,000 | $22.55 |
| 06/29/2007 | PATTERSON UTI ENERGY INC | PTEN | 32,248 | -13,869 | 845,000 | -190,000 | $26.20 |
| 03/30/2007 | PATTERSON UTI ENERGY INC | PTEN | 46,117 | -1,081,636 | 1,035,000 | -25,163,000 | $22.44 |
| 12/29/2006 | PATTERSON UTI ENERGY INC | PTEN | 1,127,753 | -44,696 | 26,198,000 | -1,660,000 | $23.23 |
| 09/29/2006 | PATTERSON UTI ENERGY INC | PTEN | 1,172,449 | 1,159,610 | 27,858,000 | 27,495,000 | $23.76 |
| 06/30/2006 | PATTERSON UTI ENERGY INC | PTEN | 12,839 | -87,827 | 363,000 | -2,854,000 | $28.27 |
| 03/31/2006 | PATTERSON UTI ENERGY INC | PTEN | 100,666 | 26,761 | 3,217,000 | 782,000 | $31.96 |
| 12/30/2005 | PATTERSON UTI ENERGY INC | PTEN | 73,905 | 57,617 | 2,435,000 | 1,847,000 | $32.95 |
| 09/30/2005 | PATTERSON UTI ENERGY INC | PTEN | 16,288 | -1,536,512 | 588,000 | -42,626,000 | $36.10 |
| 06/30/2005 | PATTERSON UTI ENERGY INC | PTEN | 1,552,800 | 322,295 | 43,214,000 | 12,427,000 | $27.83 |
| 03/31/2005 | PATTERSON UTI ENERGY INC | PTEN | 1,230,505 | 1,061,132 | 30,787,000 | 27,493,000 | $25.02 |
| 12/31/2004 | PATTERSON UTI ENERGY INC | PTEN | 169,373 | 108,368 | 3,294,000 | 2,131,000 | $19.45 |
| 09/30/2004 | PATTERSON UTI ENERGY INC | PTEN | 61,005 | 18,496 | 1,163,000 | -257,000 | $19.06 |
| 06/30/2004 | PATTERSON UTI ENERGY INC | PTEN | 42,509 | -309,260 | 1,420,000 | -11,036,000 | $33.40 |
| 03/31/2004 | PATTERSON UTI ENERGY INC | PTEN | 351,769 | 320,830 | 12,456,000 | 11,436,000 | $35.41 |
| 12/31/2003 | PATTERSON UTI ENERGY INC | PTEN | 30,939 | -104,556 | 1,020,000 | -2,648,000 | $32.97 |
| 09/30/2003 | PATTERSON UTI ENERGY INC | PTEN | 135,495 | 104,948 | 3,668,000 | 2,679,000 | $27.07 |
| 06/30/2003 | PATTERSON UTI ENERGY INC | PTEN | 30,547 | -20,596 | 989,000 | -664,000 | $32.38 |
| 03/31/2003 | PATTERSON UTI ENERGY INC | PTEN | 51,143 | -8,942 | 1,653,000 | -160,000 | $32.32 |
| 12/31/2002 | PATTERSON UTI ENERGY INC | PTEN | 60,085 | 33,627 | 1,813,000 | 1,138,000 | $30.17 |
| 09/30/2002 | PATTERSON UTI ENERGY INC | PTEN | 26,458 | 1,497 | 675,000 | -30,000 | $25.51 |
| 06/30/2002 | PATTERSON UTI ENERGY INC | PTEN | 24,961 | -9,364 | 705,000 | -316,000 | $28.24 |
| 03/31/2002 | PATTERSON UTI ENERGY INC | PTEN | 34,325 | -9,064 | 1,021,000 | 10,000 | $29.75 |
| 12/31/2001 | PATTERSON UTI ENERGY INC | PTEN | 43,389 | -616,562 | 1,011,000 | -7,146,000 | $23.30 |
| 09/30/2001 | PATTERSON UTI ENERGY INC | PTEN | 659,951 | 258,910 | 8,157,000 | 990,000 | $12.36 |
| 06/30/2001 | PATTERSON UTI ENERGY INC | PTEN | 401,041 | 401,041 | 7,167,000 | 7,167,000 | $17.87 |
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