David Einhorn acquired 4.45M Discover Financial Services shares worth $890M. It makes up 37.30% of their stock portfolio and is their biggest holding. The investor owns 1.77% of the outstanding Discover Financial Services stock. David Einhorn acquired their 4.45M shares between 2007 and 2009. So far they never sold any shares in the company. The stake costed the investor $51.2M, netting the investor a gain of 1639% so far.