Reading the tea leaves of Jamie Dimon's periodic executive shakeups can be a tricky business, but on Friday Matt Zames became one of the stronger shapes to emerge from JPMorgan Chase's (JPM) latest shuffle.

Zames, a relatively unknown name before this year, was sent in to clean up the now-infamous chief investment office after its massive trading loss came to light this spring. He will become one of Dimon's right-hand men, sharing chief operating officer responsibilities with current chief administrative officer Frank Bisignano.

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