First published by Money Metals here: https://www.moneymetals.com/news/2017/08/24/precious-metals-derivative-surge-001142

According to the most recent report on the U.S. Financial Institutions Derivatives trading activity, the U.S. banks held a record amount of precious metals contracts in the first quarter of 2017. Not only did the U.S. banks report a record amount of precious metals contracts, but they also held an unprecedented quantity in notional value of commodity and equity derivative contracts.