Ken Griffin acquired 471 Thousand Discover Financial Services shares worth $40.3 Million. That's 0.04% of their equity portfolio (488th largest holding). The first Discover Financial Services trade was made in Q2 2013. Since then Ken Griffin bought shares 50 more times and sold shares on 45 occasions. The stake costed the investor $39.8 Million, netting the investor a gain of 1.2% so far.