Ken Griffin's position in Dexcom is currently worth $364 Million. That's 0.37% of their equity portfolio (36th largest holding). The investor owns 1.14% of the outstanding Dexcom stock. The first Dexcom trade was made in Q2 2013. Since then Ken Griffin bought shares 64 more times and sold shares on 47 occasions. The stake costed the investor $292 Million, netting the investor a gain of 24% so far.