The equity sellers including the Permira funds, which acquired the company in 2018 for $1.75bn (£1.3bn), will continue to hold a significant stake in the company as part of the consortium.
As part of the transaction, the Duff and Phelps management team will also maintain a meaningful equity stake in the firm and continue to lead the company.
The transaction is subject to customary closing conditions and is expected to close in the second quarter of 2020.
Duff and Phelps advises clients in the areas of valuation, corporate finance, investigations, disputes, cybersecurity, compliance and regulatory matters, and other governance-related issues.
Noah Gottdiener, CEO of Duff and Phelps, said: “This partnership marks a vote of confidence in the long-term growth of Duff and Phelps. We are grateful to Permira and are thrilled that they will continue to be investors. We are also excited to have the backing of Stone Point Capital, Further Global and a world-class group of investors.
“Most importantly, I, along with company president Jacob Silverman, wish to thank our 3,500 Duff and Phelps colleagues who have worked tirelessly to make this company a success.”
Olivier Sarkozy, founder and managing partner of Further Global, added: “I am delighted to be reunited with Stone Point and the Duff and Phelps management team as we work to continue to build upon the incredible global franchise that Duff and Phelps has become.”