We document the wide dispersion of private equity investment returns and examine performance determinants using a newly constructed database of 7,500 investments worldwide. One in 10 investments does not return any money, whereas 1 in 4 has an internal rate of return (IRR) above 50%. Quick flips are associated with the highest returns. Performance does not appear scalable: Investments held by private equity firms in periods with a high number of simultaneous investments underperform substantially. Results are consistent with the theoretical literature on organizational diseconomies linked to firm structure. Private equity firms’ actions do not appear to be mechanical or easily scalable.

We develop a new methodology to estimate abnormal performance and risk exposure of nontraded assets from cash flows. Our methodology extends the standard internal rate of return approach to a dynamic setting. The small-sample properties are validated using a simulation study. We apply the method to a sample of 958 private equity funds. For venture capital funds, we find a high market beta and underperformance before and after fees. For buyout funds, we find a relatively low market beta and no evidence for outperformance. We find that self-reported net asset values significantly overstate fund values for mature and inactive funds.

This article describes compensation contracts in private equity. It shows that they may not align interest between the investors and fund managers as much as commonly thought. Certain clauses appear as potentially hazardous for investors and others exacerbate conflicts of interest.