Private-equity firms now own three of the five largest chains of homes in the United States, including the biggest, HCR ManorCare, which was bought by Carlyle for more than $6 billion in 2007.

Twelve companies out of the top 500 are also on the list of the Fortune 500 globally, including Huawei Technologies co Ltd, Lenovo Group, Geely Holding Group co and Wanda Group.