Private equity-backed Dunkin' Brands Inc is considering an initial public offering of about $500 million in the second half of 2011, sources familiar with the situation said. The IPO could be as large as $750 million, one of the sources said. Two or the sources said that there is disagreement among the sponsors over the company's valuation. All of the sources said the discussions are preliminary and could change. The information is not public and the sources declined to be named.
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