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In a tweet, the 200-million-user microblogging service said it had confidentially submitted the paperwork for a planned IPO.
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Also being removed from the widely watched index: Hewlett-Packard and Bank of America. Being added: Visa and Goldman Sachs. The changes reflect not only the companies' fortunes, but also the changing nature of the U.S. economy.
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The stock exchange received a deluge of data that overwhelmed its systems and shut down trading for three hours, last week.
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The tech-heavy exchange shut down at around 12:14 p.m. ET due to a problem in a data feed.
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The rise is being tied to a drop in weekly jobless claims, as well as assurances from the Federal Reserve that it would continue to support the U.S. economy.
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Stock and bond markets reacted positively to Federal Reserve Chairman Ben Bernanke's remarks on the economy Wednesday morning. Bernanke was on Capitol Hill delivering the Fed's twice yearly update on the economy and Fed policy before the House Financial Services Committee.
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Stocks surged Thursday after the chief of the Federal Reserve sent signals that the central bank wasn't in a hurry to stop helping the economy. The Standard and Poor's 500 Index closed at a record high.
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The sharp drop follows remarks by Fed Chairman Ben Bernanke that the central bank's monthly bond-buying spree could soon end. Fears over a freeze in interbank lending in China have also contributed to investor concerns.
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Thomas Peterffy's life story includes a typing robot, a proto-iPad, and a vast fortune he amassed as one of the first people to use computers in financial markets.
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Some financial experts say the fees charged by actively managed mutual funds are not worth it. Over the long haul, they could cost a retirement account tens of thousands of dollars. So NPR's Uri Berliner explores funds that have minimal expenses.