Technical issues interrupted trading for some investors using TD Ameritrade.
Spokeswoman Kim Hillyer said in an email that the problems, which she described as limited, were caused by a software update that was done overnight. The issue was resolved Friday at about 10 a.m. Eastern, she said.
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The halt in trading at TD Ameritrade Holding Corp. comes two days after the New York Stock Exchange shut down for nearly four hours because of problems associated with a software upgrade on the exchange's computers.
It has been a tremendously volatile week of trading and message boards lit up during the Ameritrade outage.