Dow Jones: We were hacked, client data exposed

Dow Jones said Friday that hackers breached its system and possibly stole payment information for some former and current subscribers.

The News Corp unit, which includes The Wall Street Journal and MarketWatch, said the data theft may only have involved fewer than 3,500 people. The system was breached between August 2012 and July 2015, according to the company's wire service.

Adam Jeffery | CNBC

Dow Jones CEO William Lewis said the company found "no direct evidence that information was stolen." The hackers appeared to target contact information in order to send fraudulent messages to customers, he added.

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Dow Jones notified individuals whose information may be vulnerable. An investigation into the breach is ongoing.

News Corp's Class B shares were down less than 1 percent Friday afternoon.