Revenues less transaction rebates, brokerage, clearance and exchange fees (net exchange revenues) were $415m for the first quarter of 2011, an increase of $55m, or 15%, from the first quarter of 2010.

Market Services net exchange revenues were $281m for the first quarter of 2011, up 17% when compared to the first quarter of 2010.

Net exchange revenues from Transaction Services were $195m for the first quarter of 2011, an increase of $40m, or 26%, when compared to the first quarter of 2010.

Total net derivative trading and clearing revenues were $80m for the first quarter of 2011, up $19m, or 31%, from the prior year quarter.

Operating income for the first quarter surged to $181m from $112m in the year-ago quarter.

Adjusted operating income improved 19% to $190m from the prior-year quarter, with operating margins expanding 200 basis points to 46% from last year’s 44%.