Ken Griffin acquired 2.62 Million Berkshire Hathaway shares worth $1.07 Billion. That's 1.08% of their equity portfolio (6th largest holding). The first Berkshire Hathaway trade was made in Q2 2013. Since then Ken Griffin bought shares 60 more times and sold shares on 39 occasions. The stake costed the investor $661 Million, netting the investor a gain of 62% so far.