Mario Gabelli acquired 52 Thousand Dexcom shares worth $4.4 Million. That's 0.05% of their equity portfolio (340th largest holding). The first Dexcom trade was made in Q1 2006. Since then Mario Gabelli bought shares eight more times and sold shares on 40 occasions. The stake costed the investor $89.4 Thousand, netting the investor a gain of 4825% so far.