Dexcom is in the business of making continuous glucose monitors and has made remote monitoring of patients with diabetes easier—especially when it comes to young children whose parents and caregivers want to be aware of their glucose levels. 

Last year, the San Diego company's share price jumped 55%, to $55.05 from $35.41 at the end of 2013. As a result, the company added $1.67 billion to its market cap.