About 46 percent of daily volume is handled through high- frequency strategies, according to estimates by NYSE Euronext, the world’s largest owner of stock exchanges. The transactions are made by about 400 of the 20,000 firms trading stocks in the U.S., according to Tabb Group LLC, a New York-based financial services consultant. Each makes bets in hundredths of a second to exploit tiny price swings in equities and discrepancies in futures, options and exchange-traded funds.
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