(BLOOMBERG) NEW YORK – The firm’s chief investment office, run by Ina Drew, 55, took flawed positions on synthetic credit securities that remain volatile and may cost an additional $1 billion this quarter or next, Dimon told analysts yesterday. Losses mounted as JPMorgan tried to mitigate transactions designed to hedge credit exposure.

“There were many errors, sloppiness and bad judgment,” Dimon said as the company’s stock fell in extended trading. “These were grievous mistakes, they were self-inflicted.”

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