"God knows how any of you can place your vote based on ISS or Glass Lewis," Dimon, 59, said Wednesday at an investor conference in New York. "If you do that, you are just irresponsible, I'm sorry. And you probably aren't a very good investor, either."

JPMorgan's board is reviewing how it pays top executives including Dimon after a record low percentage of shareholders voted this month to approve their latest packages. Investors are seeking that a greater portion of executives' incentive pay be based on performance, Lee Raymond, the board's lead director and chairman of the compensation committee, said at the firm's annual meeting May 19.

Proxy advisers Institutional Shareholder Services and Glass Lewis had recommended investors reject the pay resolution, saying the bank lacks preset goals to determine compensation and didn't give a good reason for giving Dimon his first cash bonus in three years.

Two years ago, Dimon, who also serves as chairman, fended off a push by some investors to have the board name an independent chairman. ISS and Glass Lewis had recommended investors back that measure.

Spokesmen for both firms declined to comment on Dimon's remarks.

His statements were part of a broader discussion on corporate governance. Too much emphasis is placed on rules, such as the debate over dividing roles, rather than having an involved and well-functioning board, Dimon said Wednesday.

Bus accident

"You've had the chairman-CEO split where the chairman and CEO were in cahoots, kind of, and the rest of the board abdicated its position," he said, citing past corporate scandals including at Enron.

Dimon, who underwent treatment for throat cancer last year and has previously said he'd like to be CEO for five more years, said the board has identified possible successors for the short-, middle- and long-term.

"If I'm hit by a bus, which is not my preference, but if I am, they have a plan," he said. "I'm comfortable that there are many possible successors within JPMorgan Chase."

Bloomberg