Heidi Miller has mixed feelings about her success. At a time when most bankers would consider themselves lucky if their business held steady, the CEO of JPMorgan Treasury and Securities Services has had a phenomenal run, posting record earnings in four out of the past six quarters. That success has landed her in this ranking's No. 1 spot for two consecutive years.

"My business has done well. A lot of the things I've been saying for years-the greater stability of the business, that it's less market dependent, that it benefits as being part of JPMorgan-all that has proven out," she says. "But the truth is I would be much happier, as a shareholder and as the head of a business, if all the lines within JPMorgan were doing as well as they could be in more normalized market conditions."

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