JPMorgan Chase & Co. Chief Executive Officer Jamie Dimon

JPMorgan Chase & Co. Chief Executive Officer Jamie Dimon

Andrew Harrer/Bloomberg

JPMorgan Chase & Co. Chief Executive Officer Jamie Dimon, who led JPMorgan to record earnings in each of the past three years, is grappling with regulatory investigations as the bank works to tighten internal controls following its more than $6.2 billion trading loss last year.