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Personal data on clients of UFJ Tsubasa Securities Co. have been leaked to a broker in Tokyo that deals with information on individuals, the company said Tuesday.

The second-tier brokerage believes data on as many as 12,000 clients may have been leaked, company sources said.

UFJ Tsubasa, created in a merger in June between Tsubasa Securities and UFJ Capital Markets Securities Co., notified the Tokyo Metropolitan Police Department last Thursday, the company said in a statement. No specific damage has been reported so far, the sources said.

The company said it found in October 2001 that the Tokyo broker had data on 1,000 of its clients.

The data, including clients’ names, addresses and assets on deposit, came from three branches of the former Towa Securities Co., a constituent brokerage that became part of Tsubasa Securities following a merger in April 2000 with Universal Securities Co., Taiheiyo Securities Co. and Dai-Ichi Securities Co, the sources said.

The three branches are Shinjuku Sintoshin, Akasaka and Shinbashi branches, and the data was as of February 2000, the company said.

In June, UFJ Tsubasa contacted police after it found another set of client lists had been circulated. It now believes data has been leaked systematically.

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