Jamie Dimon, the chief executive officer of JPMorgan Chase & Co., said banks are accumulating more capital than they need as regulators pressure lenders to build their reserves.

“I don’t think it’s just JPMorgan,” Dimon said today at a conference discussing the New York-based company. “I think all banks will have too much capital in two and a half years. And they’re not going to know what to do with it.”