Richard Pzena acquired 4.07M Halliburton shares worth $168M. That's 0.49% of their equity portfolio (44th largest holding). The first Halliburton trade was made in Q3 2013. Since then Richard Pzena bought shares twenty more times and sold shares on 22 occasions. The stake costed the investor $100M, netting the investor a gain of 67% so far.