Last week Internet stock trading company TD Ameritrade Holding said that one of its databases had been hacked by a thief who obtained personal information on some of its customers.

上周在线交易公司TD Ameritrade Holding说，他的一个数据库被黑客攻击了，而且黑客已经掌握了许多TD的客户资料。

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Kinahan, chief derivatives strategist at online brokerage TD Ameritrade Holding Corp.

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This year, average daily trading volume on the New York Stock Exchange is about 3.8 billion shares, down from about five billion in early 2010, while discount broker TD Ameritrade Holding Corp.

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