Shares of Citicorp have soared in the past four weeks, gaining 12% -- about four times the gain of the average bank.

The pace-setting trend continued on Tuesday with the New York bank ahead 87.5 cents to $37.875 in late afternoon trading to yet another 52-week high. The stock has appreciated a whopping 70% so far this year. The American Banker index is up 2.6% in the past month and 12% in 1993.

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