Oaktree took charge after Suning failed to meet Tuesday's deadline of repaying a debt of nearly 400 million euros ($434 million).
That sum stems from a loan — and interest — taken out three years ago, shortly after Inter won its previous league title.
"As of May 22, 2024, funds managed by Oaktree Capital Management, LP are the owners of Inter. This follows the failure to repay the three-year loan granted by Oaktree to Inter's holding company, having expired May 22, 2024 with an overall balance of approximately 395 million euros," Oaktree said in a statement sent to The Associated Press and other news outlets.
The news comes just three days after Inter was presented with its 20th league title amid a party atmosphere at San Siro.
Inter becomes the seventh Serie A club under American ownership. The others are AC Milan, Atalanta, Fiorentina, Roma, Genoa and newly-promoted Parma.