James Dimon, chairman and chief executive of JP Morgan on Tuesday told employees and shareholders he has been diagnosed with throat cancer, that the prognosis is excellent and that he will continue to be actively involved in the company during his treatment.

Dimon, 58 years old, said he has briefed the bank's board on his health. He said in a memo that he will limit his travel during the roughly eight-week-long radiation and chemotherapy treatment. Business will run as normal during that period, he said.