JPMorgan Chase (JPM) is getting serious about getting to know its customers.

The megabank is sending out letters to "millions" of clients asking for additional information about their country of citizenship, occupation and phone numbers, according to a JPMorgan customer service representative. One such letter asks clients to update their identifying information by calling a customer service line or visiting a branch by March 21.

Limited Time Offer

Save $400 off your subscription. Special offer ends April 30, 2017.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.