What had been a very profitable quarter was hammered in late March when prices of New York futures rose sharply above London rates and the value of banks' positions across the two markets fell sharply, Shahani said.
Banks' revenues from commodities increased in 2018 and 2019 after a decade of decline since the global financial crisis as heightened government regulation and poor performance made them shrink their commodities businesses.
The 12 banks Coalition tracks for its quarterly reports are Bank of America Merrill Lynch, Barclays, BNP Paribas, Citigroup, Credit Suisse, Deutsche Bank, Goldman Sachs, HSBC, JPMorgan, Morgan Stanley, Societe Generale and UBS.