Joel Greenblatt acquired 39.8 Thousand Dexcom shares worth $5.48 Million. That's 0.10% of their equity portfolio (262nd largest holding). The first Dexcom trade was made in Q2 2014. Since then Joel Greenblatt bought shares eleven more times and sold shares on ten occasions. The stake costed the investor $4.43 Million, netting the investor a gain of 24% so far.