Dexcom shares plunge more than 40%, head for worst day on record

Dexcom shares sank more than 40% on Friday and headed for their worst day ever after the diabetes management company reported disappointing revenue for the second quarter and offered weak guidance. The stock fell $45.38 to $62.47 as of early afternoon, wiping out about $18 billion in market cap. Prior to Friday, the biggest drop came in September 2017, when the shares plunged 33% in a day. Dexcom held its stock market debut in 2005.Dexcom's revenue increased 15% to $1 billion from $871.3 million a year earl ...