NEW YORK — LaBranche & Co., one of the largest specialist firms on the New York Stock Exchange, confirmed plans Wednesday to buy a smaller specialist firm, Robb Peck McCooey Financial Services, for more than $286 million of stock.

LaBranche said in a statement that it would offer 9.7 million shares of its common stock and an unspecified number of shares of preferred stock for the privately held firm. Due diligence was not yet completed, the statement said.

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