Daily spot foreign exchange trading volumes on Thomson Reuters dealing platforms fell more than 9 percent in June from a year earlier.
The average daily volume traded in June was $143 billion, down 7 percent from the previous month, when it totalled $154 billion.
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A spokesman for Thomson Reuters attributed the decline to investors’ concerns about the euro zone debt crisis.
“It is continued uncertainty in the euro zone which generally has shown a bit of a slowdown in growth of FX volumes,” he said.
Reuters has recently placed a bid for listed ECN FXall.