DexCom, Inc. is a medical device manufacturing company. The firm engages in the design, development and commercialization of glucose monitoring systems for ambulatory use by people with diabetes. Its products include Dexcom G4 PLATINUM System, DexCom G5 Mobil, DexCom Share and Mobile apps. The company was founded by John F. Burd on May 1, 1999 and is headquartered in San Diego, CA.