The California Office of the Attorney General reported that ADP, LLC experienced a data breach involving inadvertent disclosure of personal information on April 7, 2015, and May 18, 2015. The breach exposed employee names, addresses, social security numbers, and email addresses to unauthorized human resources professionals from two other ADP clients. ADP is offering affected individuals a complimentary one-year identity theft protection service through Experian's ProtectMyID.

On June 5, 2013, the California Office of the Attorney General reported a data breach involving ADP. The breach involved an accidental disclosure of employee names and Social Security numbers in a tax filing record. The specific numbers of affected individuals and the breach date are unknown.