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Dick Costolo, Jack Dorsey, Evan Williams, Biz Stone...Twitter CEO Dick Costolo, Chairman and co-founder Jack Dorsey, and co-founders Evan Williams and Biz Stone, front row left to right, applaud as they watch the the New York Stock Exchange opening bell rung, Thursday, Nov. 7, 2013.  If Twitter's bankers and executives were hoping for a surge on the day of the stock's public debut, they got it. The stock opened at $45.10 a share on its first day of trading, 73 percent above its initial offering price.

Richard Drew/AP

(From left) Twitter CEO Dick Costolo, chairman and co-founder Jack Dorsey and co-founders Evan Williams and Biz Stone, applaud as the New York Stock Exchange opening bell is rung, Thursday. If Twitter’s bankers and executives were hoping for a surge on the day of the stock’s public debut, they got it.

A woman walks past an electronic monitor displaying graphs of Japan's various stock indices outside a securities firm in Tokyo, Japan, on Friday, Aug. 23, 2013. Japanese shares rose, with the Topix index halting three days of losses, as exporters advanced after the yen weakened against the dollar.

Yuriko Nakao/Bloomberg

A woman walks past an electronic monitor displaying graphs of Japan’s various stock indices outside a securities firm in Tokyo, Japan, on Friday. Japanese shares rose, with the Topix index halting three days of losses, as exporters advanced after the yen weakened against the dollar

An investor naps in front of screens showing stock information at a brokerage house in Qingdao, Shandong province April 12, 2013. China shares extended a weekly losing streak to three with a feeble finish on Friday, dragged down by weakness in the brokerage sector with Founder Securities diving almost 7 percent.

China Daily/Reuters

An investor naps in front of screens showing stock information at a brokerage house in Qingdao, Shandong province on April 12 2013. China shares extended a weekly losing streak to three with a feeble finish on Friday, dragged down by weakness in the brokerage sector with Founder Securities diving almost 7 per cent.