The microblogging network priced 70 million shares at USD26, above the targeted range of USD23 to USD25, which had been raised once before.

The IPO values Twitter at USD14.1 billion, with the potential to reach USD14.4 billion if underwriters exercise an over-allotment option, as they are widely expected to.

If the full overallotment is exercised, Twitter could raise USD2.1 billion, making it the second largest Internet offering in the U.S. behind Facebook's USD16 billion IPO last year and ahead of Google Inc's (GOOG.O) 2004 IPO, according to Thomson Reuters data.

The focus now turns to how Twitter stock will fare on Thursday. Some analysts said they expect shares to experience a small pop during the first day. Twelve-month price targets on the stock range from USD29 to USD54.

Brian Wieser, an analyst at Pivotal Research Group who valued Twitter this week at USD29 a share, said the stock appears to have strong institutional investor support and could easily close over USD30 a share on its first day.

But he warned that trading could be volatile, given that Wall Street has struggled to value an unorthodox social media company with a newfangled business model.

"There's still so much uncertainty and it's so difficult to even identify how big the opportunity is," Wieser said. "Twitter will make Netflix look like General Electric as a bellwether of stability."

Investor enthusiasm for Twitter, which boasts 230 million users including heads of state and celebrities, is strong even though the microblogging network has never turned a profit.

Moshe Cohen, a professor at Columbia Business School in New York, said pressure on the company could quickly mount if shares lose steam out of the gate.

"Twitter, as a company with no expectations of making profits for several years, needs its investors to have faith," Cohen said. "If that stock starts to show some negative momentum from the beginning, it could last for a while."

Twitter, however, is listing amid the strongest market for U.S. IPOs since 2007, as equity markets soared and uncertainty around the U.S. debt ceiling has largely subsided for now.

A number of IPOs have doubled on their first day of trading, including Container Store Group (TCS.N_3">TCS.N), restaurant chain Potbelly Corp (PBPB.O) and software company Benefitfocus Inc (BNFT.O).

Twitter hiked its target IPO price on Monday from an initial range of USD17 to USD20. All of the proceeds from the IPO will go directly to the company, with no insider selling taking place.

Goldman Sachs Group Inc (GS.N), which led the Twitter IPO, tops the list of U.S. technology bookrunners this year with an 18.3 percent market share, up from 11 percent a year ago when it ranked fifth, according to Thomson Reuters data.

Morgan Stanley (MS.N) and JPMorgan Chase & Co JPMC.N also led the IPO.

Avoiding Facebook's Mistakes

Twitter has been focused on avoiding many of the pitfalls that plagued Facebook during its USD16 billion IPO last May. The company priced shares more conservatively than Facebook did and chose to list on the New York Stock Exchange rather than the Nasdaq.

Facebook had increased both the number of shares and the price range just before its public debut, which contributed to a sustained decline in its share price. The shares took more than a year to recover to the USD38 IPO price.

"Twitter did a good job putting together its message," said Tom Taulli, an independent IPO expert. "It wasn't about distractions, it was about having a great property and brand and a focus on the business...that wasn't necessarily the message when Facebook came out."

The high level of interest stoked by Twitter's road show spurred speculation in recent days that its bankers could raise the price again significantly higher than USD25, but they ultimately did not.

"I'm glad they didn't take it up higher, as speculated," said Suntrust Robinson Humphries analyst Robert Peck. "It still provides enough upside for investors and provides a nice contrast to Facebook."

 (Agencies)

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