David Einhorn's position in Patterson-UTI Energy is currently worth $6.84M. That's 0.29% of their equity portfolio (26th largest holding). David Einhorn started to build up the position in Patterson-UTI Energy in Q4 2008 and continued to invest until Q1 2009. Since then they sold 2.31M shares. The investor's estimated purchase price is $12M, resulting in a loss of 43%.