Major U.S. banks moved with a sense of urgency Monday to help South Korea out of its financial bind, and the stock market cheered them on.

The same multinational banking companies that suffered recent share- price declines because of Asian exposures rebounded. Chase Manhattan Corp. rose $2, to $108.6875, Citicorp was up $4.0625, to $126, and J.P. Morgan & Co. gained $2.1875, to $113.625.

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