Ken Griffin acquired 20.6 Million Amazon.com shares worth $3.8 Billion. It makes up 3.87% of their stock portfolio and is their biggest holding. The first Amazon.com trade was made in Q2 2013. Since then Ken Griffin bought shares 52 more times and sold shares on 50 occasions. The stake costed the investor $2.24 Billion, netting the investor a gain of 70% so far.