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Apple's stock broke above $500 for the first time Monday. It was the latest step in a rally that began more than two weeks ago, when the company reported staggering sales and profits for the holiday quarter.

Shares of restaurant reservation service OpenTable are trading higher Tuesday afternoon on better-than-expected results for the fourth quarter. The company posted Q4 revenue of $37.2 million, up 21% from a year ago, and ahead of the Street at $36.8 million. Non-GAAP profits of 37 cents a share topped the Street consensus at 30 cents. The ...

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.

Investors purchased roughly 850 calls at the Dec. 11 $19 strike for an average premium of $0.53 each, and snapped up nearly 700 of the Dec. '11 $20 strike calls at an average premium of $0.39 apiece. Call buyers at these strikes may profit at expiration next week in the event that shares in Research in Motion surge 6.7% and 11.4% over the current price of $18.30 to surpass the average breakeven prices of $19.53 and $20.39, respectively.

Many retailers are enjoying a Thanksgiving shopping spree lift from investors, but not Groupon. Its shares closed today down nine percent, settling at $15.24 after bouncing off a new low of $14.85. That’s less than half the $31.14 that some investors paid at the stock’s high point, just after it went public in early November. More recently, it has been trading in the low to mid-$20s.

With Google incessantly branching out into even more ventures such as music and social networking, its search business could continue to act as a minor Catch-22 situation in future by helping competition in other business lines.

Groupon, the company that pioneered online group discounts, saw its stock climb by nearly a third in its public debut Friday, showing strong demand for an Internet company whose business model is considered unsustainable by some analysts. Groupon's stock jumped $6.40, or 32 percent, to $26.40 in late morning Friday after trading began at about 10:45 a.m. Earlier, the stock was trading as high as $31.14. Big fluctuations are common for companies that have just gone public as investors gauge what to do with the stock. The stock is trading on the Nasdaq Stock Market under the ticker symbol "GRPN."

The New York Stock Exchange's website experienced slowness for a brief period of time Monday afternoon, on the same day that the hacker group "Anonymous" called for an attack against the Big Board operator's site.

Investors were not blown away by Tim Cook Apple event today. With no news of the iPhone 5 at today's Apple event, the Cupertino-based company is seeing its stock drop in value.

High-flying Apple stock hit yet another record high Monday on a day when stocks were generally under pressure due to uncertainty about the European debt crisis.