JPMorgan Chase & Co.'s chairman and chief executive James Dimon told investors at a conference Wednesday that he is optimistic about the investment banking business.

Some on Wall Street were concerned that JPMorgan Chase's strong investment banking results in the first quarter are unsustainable, and Dimon said the second quarter would not repeat the record results. So far, however, the business is "OK" this quarter, he said at the Sanford C. Bernstein & Co. LLC Strategic Decision Conference in New York.

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