Ameritrade Holding Corp., Omaha, a discount broker, said Thursday that it has signed a joint venture agreement with Deutsche Bank.

The agreement would let the parties' respective customers trade on-line in both the German and U.S. securities markets, Ameritrade said in a statement. It added that the venture would give U.S. investors their first real-time access to German and European securities on the Internet, through Deutsche Bank's on-line unit Bank 24.

Ameritrade has been an aggressive player in U.S. discount brokerage. With $580 billion of assets, Deutsche Bank is the second-largest financial institution in the world.

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