Mario Gabelli acquired 53 Thousand Dexcom shares worth $7.1 Million. That's 0.07% of their equity portfolio (269th largest holding). The first Dexcom trade was made in Q1 2006. Since then Mario Gabelli bought shares eight more times and sold shares on 39 occasions. The stake costed the investor $91.1 Thousand, netting the investor a gain of 7694% so far.