Princo’s Private Equity Investments

I would like to know approximately what percentage of the Princeton University endowment is placed with private equity organizations. If possible, could you tell me what return the University realized with money placed in private equity? 

Could you also give me an explanation of how a private equity company is defined, as opposed to a company that invests money? 

Editor’s note: According to the University’s Financial Statements, as of June 30, 2025, $14.7 billion of managed investments (about 40%) were in private equity. Princo did not publicly report annual returns by asset category.