The Financial Times earlier reported that Mizuho had conducted an investigation into its possible losses related to the U.S.-based fund, and its potential losses could be similar to those of the brokerage arm of Mitsubishi UFJ Financial Group Inc. MUFG on Wednesday estimated its loss at around $270 million. "We refrain from making comments on individual deals, but we don't currently see any issue that may affect our profit forecast," said a spokeswoman for Mizuho, adding the bank does not conduct prime brokerage services globally. Mizuho's U.S. subsidiary has lent to Archegos, the Nikkei reported. Losses at Archegos, a family office run by former Tiger Asia manager Bill Hwang, sparked a sell-off in stocks including media giant ViacomCBS and Discovery on Friday, a source familiar with the matter said this week. The sale triggered bank margin calls for Archegos, according to sources familiar with the matter.