Shares of Citigroup Inc. rose by as much as ¥250, to ¥4,580, on its first day of trading on the Tokyo Stock Exchange, even as the U.S. financial giant was rocked by the resignation of Chief Executive Officer Charles Prince over widening losses stemming from housing loan debts.

Citigroup shares closed the day at ¥4,550, compared with Friday's close in New York of $37.73, or ¥4,330 at the current exchange rate.

Citigroup is the first U.S. company to be listed on the TSE since 2001, when JPMorgan Chase & Co. debuted on the Tokyo bourse.