The Nasdaq Stock Market Inc. reported on Thursday that its net income tripled in the second quarter of this year.

Net income reached 56.1 million U.S. dollars, or 39 cents per diluted share, an increase of 39.5 million dollars from 16.6 million dollars, or 13 cent per diluted share, in the second quarter of 2006.

Operating income was 99.0 million dollars for the second quarter of 2007, an increase of 62.7 million dollars when compared to 36.3 million dollars for the second quarter of 2006.

Revenues were 198.7 million dollars in the second quarter of 2007, an increase of 16.1 percent from 171.1 million dollars in the period a year ago.

"In the second quarter, Nasdaq's core business operated on all cylinders, reaching record operating earnings on the back of new product innovation and customer service initiatives," said Bob Greifeld, president and chief executive officer of Nasdaq.

For the full year, Nasdaq expects net income in the range of 171.0 million dollars to 181.0 million dollars.