By purchasing Wachovia Corp., Citigroup — which is receiving federal aid on the deal — will pick up additional market share in both residential lending and servicing, challenging Bank of America, Chase, and Wells Fargo for the top perch in the industry.

Among servicers, Wachovia had a 2.09% market share. In lending, Wachovia's share was much higher — 3.89%. When the dust settles from the recent spate of acquisitions, the mortgage industry will have four $1 trillion-plus servicers: Bank of America ($2.09 trillion), Wells Fargo ($1.50 trillion), Chase ($1.45 trillion), and Citigroup ($1.02 trillion).

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