NetBank's alliance with Ameritrade Holding Corp. marks the continuation of a strategy that has helped the Internet bank more than triple its customer accounts since the middle of 1999.

NetBank, based in Atlanta, and Ameritrade of Omaha have agreed to offer reciprocating services to their clienteles. Under the pact announced Tuesday, NetBank will offer its banking services to Ameritrade's more than one million customers and Ameritrade, through its subsidiary Amerivest Inc., will offer brokerage services to NetBank customers. The alliance gives both companies easy access to the other's customer base, said D.R. Grimes, NetBank's chief executive officer. "I think this is the perfect partnership for us," he said. "I want banking customers, Ameritrade wants investment customers."

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