Two of the biggest private-equity firms are disclosing fees that had largely been hidden as U.S. regulators demand increased transparency from the industry.

Blackstone Group LP said it could collect as much as $20 million annually from investors and companies in its next buyout fund, for services such as health care consulting and bulk purchasing. TPG Capital put the potential charge for similar services at as much as $10 million a year for its new fund, which is currently seeking to raise as much as $10 billion.

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