Ares Management has invested $1.45 billion into DuPage Medical Group, the largest independent physicians group in Chicago, DuPage announced. The transaction closed Tuesday.

Under the deal, the Century City-based asset management company bought into Boncura Health Solutions, a DuPage Medical practice management subsidiary that offers billing and other services to the physicians group, and other subsidiaries.

DuPage officials said the new money, including equity and debt financing, will allow the group to be 100 percent physician owned and directed, while allowing for the purchase of doctors’ practices and the opening of new outpatient clinics.

Ares Management, founded in 1997, is a publicly traded global alternative asset management firm with $104 billion in assets.