Shares in two of China's biggest conglomerates, Fosun International and HNA, fell by about 6% on Thursday, amid rumours that banks had been ordered to assess their loan exposure to them, according to BBC.
Fosun bought Wolverhampton Wanderers football club last year, while HNA is Deutsche Bank's biggest shareholder.
Reports said the banking regulator had also told lenders to investigate loans to Anbang Insurance, Odeon UK cinema owner Dalian Wanda and Zhejiang Luosen.
All five are big overseas investors.
The conglomerates' other high profile acquisitions include Zhejiang Luosen buying AC Milan football club earlier this year.
HNA also owns airport services firm Swissport and airline caterer Gate Gourmet, and it has a 25% share in Hilton.
Anbang owns New York's Waldorf Astoria hotel.