China Minsheng Banking Corp. is weighing a plan to increase its stake in UCBH Holdings Inc., a California lender facing a regulatory deadline to bolster capital, said two people briefed on the matter.

Minsheng, China's first privately owned bank, plans to seek U.S. regulatory approval to boost its holding in UCBH, of San Francisco, the holding company for United Commercial Bank, to at least 50% from 9.6%, the people said, declining to be identified because the talks are private.

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