Speculation that Republic New York Corp. is about to be sold to the Swiss banking giant UBS AG drove Republic's shares up 13.7% on Friday, accelerating a sharp monthlong increase.

Sources predicted that UBS would pay $75 a share, which would be about 37% higher than the $47 price that prevailed in early April. At Friday's close, shares of the $50.5 billion-asset company were at $70, up $8.4375.

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