The Anglo-American Precious Metals Derivatives Duopoly: Quarterly OCC Report

The US Office of the Currency Comptroller (OCC) issues a Quarterly Report on the Derivatives exposure of US Banks and Trust. The report, including historical archives, can be found here.

The report includes "all insured U.S. commercial banks and trust companies as well as other published financial data." So obviously it is not comprehensive of private funds, and banks without a US subsidiary