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Nasdaq OMX Group Inc said it will offer cash and rebates totaling $40 million to compensate clients affected by the problems with Facebook Inc's initial public offering.

Facebook on Thursday priced its initial public offering at $38 per share. The social networking company, which is expected to go public tomorrow under the ticker symbol "FB," stands to reap $18.4 billion in the IPO.

Apple is the world's most valuable company. The Dow Jones industrial average is probably the world's best-known stock index. So don't they deserve each other? Consider this: If Apple had been added to the Dow in June 2009, the last time there were serious rumors that it would happen, the average would be about 2,500 points higher than it is today and well above its all-time high.

Apple Inc.'s stock hit a rough spot earlier this month, but with the stock springing up 9% so far Wednesday, things seem to be smoothing out.

Google Inc announced a stock split designed to preserve the control of co-founders Larry Page and Sergey Brin over the No. 1 Web search engine, as it posted revenue in line with estimates.

Apple, already the world's most valuable company, hit the $600 billion level for the first time Tuesday....

Facebook will list its shares with Nasdaq, according to media reports. That would be a big win for the Nasdaq, which competes fiercely with NYSE Euronext Inc., especially for an initial public offering as large as Facebook's, pegged at $5 billion. The New York Times and CNBC cited anonymous sources on the potential listing.

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.

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.

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."