Ken Griffin acquired 1.5 Million Humana shares worth $488 Million. That's 0.50% of their equity portfolio (17th largest holding). The investor owns 1.28% of the outstanding Humana stock. The first Humana trade was made in Q2 2013. Since then Ken Griffin bought shares 53 more times and sold shares on 45 occasions. The investor's estimated purchase price is $607 Million, resulting in a loss of 20%.