Inside the JPMorgan Trading Desk the U.S. Called a Crime Ring

Billionaires have Davos. For filmmakers, there’s Sundance. For the people who mine and trade and ship everything from iron ore to platinum, there’s London Metal Exchange Week. It’s a blur of symposiums and drinks, with a reliably lavish lunch thrown by JPMorgan Chase & Co. On a balmy October day in 2018, hundreds of guests crossed a courtyard in the shadow of the Bank of England to a medieval guild hall for champagne and sashimi courtesy of the bank and its top metals trader, Mike Nowak.

Nowak had plenty to celebrate. His global trading desk at JPMorgan was the ...