Fleet Financial Group may face antitrust questions about the small business powerhouse it would create by buying Shawmut National Corp.

The latest data show the two companies holding 18.1% of New England small business loans, and 23.4% of the regional dollar amount. The data - call reports from last June for business loans of less than $1 million - show Fleet and Shawmut with 35,177 such loans, worth nearly $2.6 billion, in New England and New York.

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