According to Bloomberg News, the U.S. Securities and Exchange Commission has asked some major hedge funds to look at their employees' personal mobile phones for evidence of business dealings on unapproved channels.
The report said that the hedge funds include Steve Cohen's Point 72 Asset Management and Ken Griffin's Citadel.
Citadel said that it had no immediate comment, while the SEC and Point 72 did not respond immediately to a request for comment.
The Commodity Futures Trading Commission fined 16 financial firms last year, including Goldman Sachs Group Inc. and Morgan Stanley, a combined $1.8 billion after staff discussed deals and trades on their personal devices and apps, in a probe of record-keeping practices.
In October, a report from the SEC said that the investigation had expanded to investment funds and advisers.