Commodities revenue at the 10 largest banks fell 25 percent in the first half of the year, according to analytics company Coalition.

Revenue fell to about $2.7 billion from $3.6 billion in the same period last year, Coalition said in an e-mail today.

“This was mainly due to lower client activity and lack of volatility,” Coalition said. “On a relative basis, investor products and power and gas had the largest decline.”