Over the past year, hackers have repeatedly penetrated the computers at NASDAQ, reports the Wall Street Journal. Federal investigators are trying to identify the hackers and their purpose.
However, the trading platform wasn't compromised, people familiar with the matter told WSJ.
Investigators think unlawful financial gain, theft of trade secrets or a national-security threat designed to damage the exchange could be reasons for the penetrations.
"So far, [the perpetrators] appear to have just been looking around," one person involved in the Nasdaq matter told WSJ.
Sources familiar with the matter told WSJ that the Secret Service started investigating the attempts about a year ago.
Authorities have yet to identify any trail, specific individual or country associated with the incidents.