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A hacker network that claims to be based in Saudi Arabia paralyzed the websites of Israel's stock exchange and national airline on Monday, escalating an international cyber war that has jolted this security-obsessed country.

In order to identify the best and worst stocks in the Dow for 2012, we reviewed the DJIA stocks which had the most and least implied upside.

Stocks ended trading flat Wednesday, after steadily fighting their way back from an initial drop early in the session. Worries about the European economy seemed to weigh on investors.

Stocks rose sharply on the first trading day of 2012 as upbeat U.S. economic data overshadowed continuing concerns about the European debt crisis.

Top investors stumble, but a strong fourth quarter pushes blue chips into the black. Meanwhile, the S&P 500 ends the year almost exactly where it started.

The exchange operators extended the deadline for completing their planned tie-up to March 31 while European competition authorities continue an in-depth probe of the deal.

Stocks are surging following encouraging signs out of Europe and a jump in apartment building in the U.S. The Dow Jones industrial average jumped more than 300 points....

Investors appear to be souring on social networking shares, a development which bodes ill for the eventual IPOs for Facebook, Twitter and other players in the industry. Perhaps unnerved by the lackluster reception for Zynga shares, the sector took a pounding in Monday's trading.

Stock indexes gave back some of their gains Monday and the euro turned lower against the dollar following a report that Germany and five other major European nations could risk having their credit ratings downgraded.

The Dow closed up 490.05 points, or 4.2%, to 12,045.68. It was the largest point and percentage advance since March 23, 2009, when the index shot up 497 points, or 6.8% -- just as the latest bull market was beginning.