As Citicorp investors rush to book profits from Monday's run-up in the stock, at least one analyst is advising them to sit tight.

Citicorp shares should rise 25%, to $200, within the next 12 months, Carla D'Arista of Friedman, Billings, Ramsey & Co., said Wednesday. Two days after the banking company unveiled its $70 billion merger pact with Travelers Group, Ms. D'Arista upgraded its stock to "buy" from "accumulate."

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