PRIMECAP Management's position in Sony . is currently worth $2.31 Billion. That's 1.72% of their equity portfolio (15th largest holding). The investor owns 1.72% of the outstanding Sony . stock. The first Sony . trade was made in Q1 2013. Since then PRIMECAP Management bought shares twelve more times and sold shares on 32 occasions. The stake costed the investor $384 Million, netting the investor a gain of 500% so far.