His organization, Fosun International, affirmed on Friday that he was helping powers with an examination.
The affirmation took after reports that he had disappeared.
Monetary magazine Caixin said that staff at Fosun had been not able contact Mr Guo since Thursday evening.
Fosun, one of China's greatest private aggregates, stopped exchanging of its Hong Kong shares taking after the reports.
The organization said that its shares would resume exchanging on Monday.
Fosun said that Mr Guo, 48, who has been depicted as China's Warren Buffett, was still ready to be included in real choices.
It was not clear why police had confined him.
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