CME Group has reported results for the first quarter of this year ended March 31, 2011. The U.S. exchange operator reported operating income of $832 million in the first quarter of 2011, compared to $524 million in the first quarter of last year.

The Illinois-based firm’s operating margin for the first quarter increased to 63% from 60% in the same period a year ago. CME Group also disclosed net income of $457 million for the first quarter of this year.

Click here for the release from CME Group.