NYSE EURONEXT

U.S. stock index futures were lower on Tuesday, easing after the previous session's hefty gains and as concerns lingered about how Greece will get its budget deficit under control.

U.S. stock index futures were lower on Tuesday, easing after the previous session's hefty gains and as concerns lingered about how Greece will get its budget deficit under control.

The sharp fragmentation of the U.S. stock marketplace -- seen as a cause of last week's mysterious market dive -- is also slowing down regulators' ability to piece together what happened, two sources familiar with the matter said on Monday.

The heads of leading U.S. stock market operators have been called to Washington for an emergency meeting on Monday, days after a spine-chilling plunge in stock prices continued to perplex U.S. regulators.

The heads of leading U.S. stock market operators have been called to Washington for an emergency meeting on Monday, days after a spine-chilling plunge in stock prices continued to perplex U.S. regulators.

The two largest U.S. stock exchange operators, NYSE Euronext and Nasdaq OMX Group, called a truce and issued a joint statement on Sunday, pledging to co-operate with each other and regulators to get to the bottom of last week's dramatic stock market plunge.

President Barack Obama said on Friday that regulators would look for ways to prevent a repeat of Thursday's mysterious stock market meltdown, adding to expectations the U.S. government will make new regulations to curb runaway computer trading.

Stocks turned negative for the year on Friday on fears of another credit crisis stemming from Greece's souring finances and lingering questions about what triggered the previous session's dramatic plunge.

President Barack Obama said U.S. authorities were investigating the cause of a nearly 1,000-point plunge in the Dow Jones industrial average that spooked investors and fueled anger at Wall Street.

U.S. stock index futures fell on Tuesday after a broad rally in the previous that took the S&P 500 to its best day in two months as investors fretted over whether Greece could make deep spending cuts.

NYSE Euronext reported a 26 percent increase in quarterly profit as its growing derivatives operation offset sluggish stock trading.

NYSE Euronext said on Tuesday its quarterly profit rose 26 percent, matching expectations as its growing derivatives operation offset sluggish stock trading at the exchange operator.

The basic materials and financial sectors on Wednesday lifted the Dow Jones Industrial Average to a new 2010 intraday high of 10,766.

The stock market rallied from a morning loss to inch into positive territory by the closing, a pattern often seen in recent sessions.

The appetite and sense of urgency for world financial reform have waned as markets have rebounded and the world economy has shown signs of recovering, the head of exchange operator NYSE Euronext said on Thursday.

The U.S. stock market rallied on Monday as the session marked the one year anniversary of the 2009 market bottom.

After digesting several economic data releases in the morning session, the U.S. stock market rallied to close at a modest gain.

The U.S. stock market erased morning gains to trade negative for the day, despite declining unemployment claims, better than expected sales from retailers, and Greece's successful auction of its 10-year bonds.

The U.S. stock market edged up Friday on mixed economic data. The strength of the energy and health care sectors helped lift the broad market.

The S&P 500 tracked Asian indices to open up higher, then reversed course dramatically after President Barack Obama's health care proposal was announced at 10:00 a.m in New York. followed by modest gains which have turned negative.

Major U.S. stock indices closed higher on Friday as the market shook off initial fears stemming from the Fed's discount rate hike and saw the positive implications for such move.