BOAZ WEINSTEIN didn’t know it, but he had just hooked the London Whale.
It was last November, and Mr. Weinstein, a wunderkind of the New York hedge fund world, had spied something strange across the Atlantic. In an obscure corner of the financial markets, prices seemed out of whack. It didn’t make sense.
Mr. Weinstein pounced.
As the financial world now knows, what was out of whack was JPMorgan Chase & Company. One its traders, Bruno Iksil, the man later nicknamed the London Whale for his outsize trades, was about to blow a multibillion-dollar hole in the mighty House of Morgan.
But the resulting uproar, in Washington and on Wall Street, has largely obscured a simple truth of the marketplace. Yes, Morgan lost big — but, as Mitt Romney has pointed out, someone else won. And that someone or, rather, those someones, turn out to be Boaz Weinstein and a wolf pack of like-minded hedge fund managers.
In the London Whale, these traders saw a rich opportunity, and they seized it with both hands. That, after all, is the way hedge funds roll. His cool calculus has made Mr. Weinstein a very rich man: he is in talks to buy the Fifth Avenue co-op of a reclusive heiress, Huguette Clark, for $24 million.
It might seem remarkable that someone like Mr. Weinstein, a man virtually unknown outside of financial circles, could deal such a stinging blow to one of the world’s largest, most respected banks. Jamie Dimon, the chairman and chief executive of JPMorgan and a face of the banking establishment, is struggling to contain the damage from what he has called a “terrible, egregious mistake.” The loss — JPMorgan put it at $2 billion, but it may turn out to be $3 billion or more — has renewed calls for stronger financial regulation.