CME Group, the world's leading and most diverse derivatives marketplace, announced August volume averaged an all-time record 17.1 million contracts per day, up 46 percent from August 2010, and up 35 percent sequentially. Total volume for August was 393 million contracts, of which 84 percent was traded electronically. August 2011 month-end open interest reached 100 million contracts, up 7 percent from the same period last year.