1. DexCom
R&D spend: $156.1 million
Percent of revenues: 27.2%
2017 overall revenue rank: 75
Dexcom’s G5 Mobile continuous glucose monitoring system gives users glucose readings every 5 minutes and provides them with a trend arrow so they can see where they’re heading. The idea is to take the guesswork out of managing diabetes. Plus, the CGM can be accessed and shared safely and conveniently via smart iOS devices, as well as some of the most popular flagship phones using Android, according to San Diego–based Dexcom (Nasdaq: DXCM).