David Einhorn - Greenlight Capital
Holding/activity history for Patterson-UTI Energy Inc. (PTEN)
| Period | Shares | % of Portfolio | Activity | % Change to Portfolio | Reported Price |
| 2010 Q1 | 0 | 0 | Sell 100.00% | 0.65 | |
| 2009 Q4 | 1,173,620 | 0.65 | Reduce 62.32% | 1.08 | $15.35 |
| 2009 Q3 | 3,115,000 | 1.92 | $15.10 | ||
| 2009 Q2 | 3,115,000 | 2.10 | Reduce 10.49% | 0.25 | $12.86 |
| 2009 Q1 | 3,480,000 | 1.66 | Add 339.86% | 1.28 | $8.96 |
| 2008 Q4 | 791,153 | 0.59 | Buy | 0.59 | $11.51 |