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BRASILIA, Aug 27 (Reuters) - The board of Itaú Unibanco Holding SA, Brazil's largest lender by market value, has approved the buy-back of up to 11 million common shares and 55 million preferred shares, the bank said on Thursday in a securities filing.
The program involves less than 10 percent of the 287,786,288 common shares and 2,921,796,086 preferred shares on the market, the bank said.
Reporting by Anthony Boadle; Editing by Dan Grebler