UBS, no stranger to the No.1 spot, once again emerged on top of the manager activity rankings for both agency and non-agency MBS, according to final results from Thomson Financial's RMBS 2003 league tables for the first three quarters of the year.

UBS took top place with $83.31 billion in proceeds and a 12.9% market share. However, the first placer did not replicate its performance over the same period last year. In the first three quarters of 2002, UBS emerged the winner with a larger market share - 15.7%.

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