Nasdaq Stock Market Inc, the operator of the technology-heavy US index, tripled its profits in the second quarter, the company said Thursday, according to dpa. Second-quarter profits were 56.1 million dollars, or 39 cents per share, over 16.6 million dollars, or 13 cents per share, in the year earlier period. Quarterly revenues were 558.2 million dollars, compared to 411 million in the second quarter of 2006. Nasdaq Stock Market benefited from a boom in trading on US markets. The company is also in bidding to acquire Swedish exchange OMX AB for 3.8 billion dollars. An earlier move to get a foothold in the European market by acquiring the London Stock Exchange Plc fell through.