CME Group Inc.'s (CME) May daily trading volume fell 20% from the all-time high reported for the year-earlier month, the exchange operator said Thursday.

Ongoing credit issues faced by European nations drove widespread hedging in the world's major derivatives markets late last spring, leading to surging volumes at CME and peers such as NYSE Euronext (NYX) and Deutsche Boerse AG (DB1.XE). May 2010 was also a big month for stock volatilty as massive moves during the May 6 "flash crash" stoked market fears.

Last month's drop comes as CME, the world's biggest derivatives exchange operator by contract volume, had seen volume boosted lately by political turmoil in Northern Africa and the Middle East alongside the March 11 earthquake in Japan, roiling energy and fixed-income markets.

CME said Tuesday its daily volume averaged 13.5 million contracts in May, which was an 11% increase from April. A record 85% of last month's total 283 million contracts were traded electronically.

Daily volume for interest-rate futures, CME's biggest product by that metric, fell 20% from a year earlier to 6.5 million contracts a day. Equity index volume plunged 35% while foreign exchange had a 26% decline.

Class A shares closed Wednesday at $277.87 and were inactive in recent premarket trading. Through the latest close, the stock is down 14% the past year.

-By Matt Jarzemsky, Dow Jones Newswires; 212-416-2240; matthew.jarzemsky@dowjones.com

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