Shares of Hanmi Financial Corp. were down nearly 10 percent Thursday after the Koreatown bank holding company revealed that talks with a potential investor had ended without a deal.

Regulators have told the parent of Hanmi Bank it needs to raise $100 million in capital by July 31 due to losses stemming from its commercial real estate loan portfolio.

Hanmi had been in talks with GWI, a Brazilian investment firm owned by Korean immigrant Mu Hak You, about a financing deal that would have given GWI a controlling interest in the bank.

But in a filing with the Securities and Exchange Commission on Wednesday night, the bank said that after due diligence and preliminary discussions, GWI withdrew its offer.

On Monday, Hamni said in its annual report that it wasn’t sure it could raise additional capital, a possibility that “raises substantial doubt about our ability to continue as a going concern.”

Shares of Hanmi were down 24 cents, or 10 percent, to $2.27 in mid-day trading on the Nasdaq.