Ken Griffin acquired 1.38 Million MerckInc shares worth $133 Million. That's 0.14% of their equity portfolio (159th largest holding). The first MerckInc trade was made in Q2 2013. Since then Ken Griffin bought shares 55 more times and sold shares on 53 occasions. The stake costed the investor $112 Million, netting the investor a gain of 18% so far.