PRIMECAP Management acquired 8.9 Million Xencor shares worth $190 Million. That's 0.14% of their equity portfolio (97th largest holding). The investor owns 13.09% of the outstanding Xencor stock. The first Xencor trade was made in Q4 2013. Since then PRIMECAP Management bought shares 21 more times and sold shares on eighteen occasions. The stake costed the investor $178 Million, netting the investor a gain of 6.7% so far.