JPMorgan Chase & Co. trader Bruno Iksil, known as the London Whale because his bets this year were so large, has been a leviathan of a risk-taker since at least 2010, a person with knowledge of the matter said.

Iksil’s value-at-risk, a measure of how much a trader might lose in one day, was typically $30 million to $40 million even before this year’s buildup, said the person, who wasn’t authorized to discuss the trades. Sometimes the figure, known as VaR, could surpass $60 million, the person said. That’s about as high as the level for the firm’s entire investment bank, which employs 26,000 people.

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