Morgan Stanley reported Monday that it has terminated an employee for stealing wealth management data from up to 10 percent of its clients. The firm claims there is so far “no evidence of any economic loss” for its clients, but account names and numbers for roughly 900 clients were briefly posted online.

The company says the information did not include Social Security numbers or passwords. In a release, Morgan Stanley reports that it is “working with the appropriate authorities to conduct and conclude a thorough investigation of this incident.”

According to a CNBC source, the missing information was found on December 27 during a routine scan Morgan Stanley performs on suspicious websites.