Stock Clearinghouse Leaked Sensitive Data, Trading Firm Says

The clearinghouse that processes U.S. stock trades is selling data that sophisticated traders can use to profit at the expense of more traditional investors, according to a report from an institutional brokerage firm.

The Depository Trust & Clearing Corp. is “leaking sensitive trading data” via two little-known data feeds, brokerage Themis Trading said in the report, which it circulated to clients earlier this week.