U.S. Bancorp is interested in acquisitions involving any of the nation's 25 biggest banking companies, said Richard K. Davis, its chairman and chief executive, and it has taken a look at Royal Bank of Scotland Group PLC's Citizens Financial Group Inc. as part of an ongoing analysis of suitable targets.

Mr. Davis said at a conference in New York hosted by Merrill Lynch & Co. Inc. that he is most interested in large purchases, because they would provide "enough scale and enough opportunity" for his $247 billion-asset Minneapolis company.

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