Ken Griffin acquired 929 Thousand West Pharmaceutical Services shares worth $342 Million. That's 0.35% of their equity portfolio (38th largest holding). The investor owns 1.24% of the outstanding West Pharmaceutical Services stock. The first West Pharmaceutical Services trade was made in Q2 2013. Since then Ken Griffin bought shares 46 more times and sold shares on 40 occasions. The stake costed the investor $315 Million, netting the investor a gain of 8.6% so far.