Earnings

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

Dexcom shares sank more than 40% on Friday, their steepest decline ever, after the diabetes management company reported disappointing revenue for the second quarter and offered weak guidance. The stock fell $43.85 to close at $64, wiping out more than $17 billion in market cap. Prior to Friday, the biggest...

Earnings

AT&T beats estimates for subscriber additions on demand for higher-priced plans

  AT&T exceeded market expectations for wireless subscriber additions in the second quarter on Wednesday, as the telecom operator's higher-tier unlimited plans attracted customers. The company added 419,000 monthly bill-paying wireless phone subscribers, compared with expectations of 284,800 additions, according to five analysts polled by FactSet. AT&T's unlimited plans that...