David Tepper acquired 1 Million Lam Research shares worth $76.6 Million. That's 1.17% of their equity portfolio (28th largest holding). The first Lam Research trade was made in Q2 2006. Since then David Tepper bought shares eight more times and sold shares on fourteen occasions. The stake costed the investor $56.4 Million, netting the investor a gain of 36% so far.