Dozens of stocks posted big swings in early trading Wednesday asthe result of a technology problem at market maker Knight CapitalGroup, bringing renewed calls for increased regulation ofelectronic trading, Newsday reports. Wednesday's problems are onlythe latest in a series of glitches related to electronic trading,including the problems on Facebook's initial day of trading in Mayand the May 2010 “flash crash,” in which the Dow dropped 600 pointsin 10 minutes.

Critics say the problems with electronic trading are erodinginvestors' confidence in the U.S. stock market.

The wild trading Wednesday came as the Securities and ExchangeCommission put out rules requiring a single consolidated feed ofstock trades, a response to the 2010 flash crash.

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