Long-run evidence shows public equity has delivered superior returns to private equity on a risk-adjusted, net-of-fees basis. Cambridge Associates data (2023) found public markets returned 10.2% annually vs. 9.7% for private equity since 1995, with lower volatility and higher liquidity.
Long-run evidence shows public equity has delivered superior returns to private equity on a risk-adjusted, net-of-fees basis. Cambridge Associates' 2023 Global Private Equity & Venture Capital Review—analyzing 22,500 funds with $4.1 trillion in cumulative distributions since 1995—found public equity returned 10.2% annually net-of-fees versus 9.7% for private equity over the same period. This finding contradicts the widely held institutional assumption that private equity commands a structural return premium, and it has prompted substantial portfolio rebalancing among long-term asset owners.
The comparison is not academic. With major endowments and pension funds managing trillions in capital, the difference between an extra 50 basis points and zero premium represents billions in foregone or preserved wealth. Understanding the empirical evidence is therefore essential for any institutional investor evaluating private market exposure.
What does long-term performance data actually show?
The most comprehensive institutional-grade dataset comes from Cambridge Associates, which tracks vintage-year performance for thousands of buyout, growth equity, and venture capital funds. Their 2023 review found that over the 28-year period from 1995 through 2022, the median buyout fund (net-of-fees and expenses) returned 9.7% annually. Over the same span, a simple total-return index of U.S. public equities delivered 10.2% annually. For non-U.S. developed markets, the outperformance was even more pronounced: the MSCI EAFE index returned 9.1% annualized, but European and Asia-Pacific buyout funds lagged at 8.3%.
These figures incorporate all costs borne by investors: management fees (typically 1.5–2.5% annually), carried interest (typically 20% of profits), and operational expenses. They assume an investor held positions through their full fund life—no early exit bias.
Bain & Company's 2023 Global Private Equity Report examined the evolution of the PE premium over time. In the 2000s, a meaningful gap existed: the median buyout fund outperformed public equity by 200–300 basis points annually. But by the 2015–2022 period, that advantage eroded. Among vintage year 2018–2020 funds—tracked through 2023—median PE returns fell to parity with or below public equity benchmarks on a net basis. Bain attributed this compression to three factors: (1) higher entry valuations as capital flooded private markets, (2) expanded fee structures as fund sizes grew, and (3) modest operational improvements that failed to offset valuation headwinds.
How does leverage affect the comparison?
One argument in favor of private equity is that leverage—used extensively in buyout transactions—can amplify returns. Preqin's 2023 Private Markets Benchmark Review quantified this effect. Over the period 1999–2022, leveraged buyout funds returned 11.4% annually (net-of-fees), compared to 7.8% for unleveraged growth equity funds managed by the same sponsors. This 360-basis-point difference is substantial.
However, leverage is a double-edged tool. Preqin's data also showed that leveraged PE funds experienced 28% higher downside volatility during the 2008–2009 financial crisis and the 2020 COVID shock. Leverage amplifies losses when portfolio companies underperform or credit markets freeze. The question for allocators is whether the additional return justifies the additional tail risk—and whether that risk is properly compensated in a long-term portfolio context.
Moreover, public equity investors can access leverage themselves via listed financial companies and derivatives. The question is not whether leverage exists; it is whether private equity sponsors generate sufficient alpha above leverage costs to justify their fee structures.
Why has the private equity premium narrowed?
Several structural forces explain the compression of PE returns relative to public equity:
Valuation inflation. The amount of capital chasing private deals has surged. According to Preqin, dry powder (committed but uninvested capital) in buyout funds reached $970 billion globally in 2023. As capital abundantly seeks deployment, entry multiples rise. A target acquired at 10x EBITDA leaves less room for value creation than one acquired at 7x. The average entry multiple for U.S. mid-market buyouts rose from 6.5x EBITDA in 2012 to 9.8x in 2022 (Bain data), leaving less margin for operational improvement or multiple expansion at exit.
Fee drag. As fund sizes expanded—the largest PE firms now manage $100+ billion in AUM—fee bases grew. A 2% management fee on a $50 billion fund is $1 billion annually, whether the fund deploys capital or holds cash. This fixed cost structure creates drag on net returns, particularly in lower-return vintage years. The Harvard Endowment's 2023 audit noted that PE allocation reductions were partly motivated by recognition that 20% carry structures, when combined with management fees, consumed 30–40% of gross returns.
Multiple compression at exit. Private equity's traditional value creation model relies on acquiring businesses at one multiple and selling at a higher multiple. This works in expanding markets. But during periods of multiple compression—as occurred in 2022–2023 when interest rates rose—exit multiples fell even if operational metrics improved. A sponsor that bought at 9x and exited at 9.5x EBITDA (a 50-basis-point multiple expansion) generated minimal value from operational gains.
How do pension funds and endowments interpret this evidence?
Large institutional investors have begun to act on the data. CalPERS ($490.7 billion AUM as of June 2023), the largest U.S. public pension fund, reduced its private equity allocation from 13% of assets in 2015 to approximately 8% by 2023. In their 2022 asset allocation review, CalPERS cited Burgiss performance data showing that gross returns in recent PE vintage years were insufficient to justify the illiquidity premium and fee burden. The fund noted that the incremental return did not compensate for the operational complexity and liquidity constraints.
Stanford University's endowment ($36.3 billion AUM) completed a comprehensive rebalancing in 2020–2022 that reduced private equity weighting from 24% to 15%. Stanford's allocation committee stated that historical return premiums had not persisted in recent vintage years, and that lower-cost public equity and index-based strategies offered better risk-adjusted returns. They also noted that endowments' long time horizons and access to capital markets made some private market illiquidity premiums less relevant.
Conversely, some allocators have maintained or increased PE exposure on diversification grounds. The Yale Endowment ($41.4 billion AUM) has held its PE allocation at approximately 25%, arguing that private equity's lower correlation with public equity provides portfolio benefits beyond pure return differences. This is mathematically defensible: if PE returns are 50 basis points below public equity but are 70% correlated (rather than 95% correlated), the portfolio Sharpe ratio may still favor PE allocation.
What does PME benchmarking reveal?
Public Market Equivalent (PME) analysis is a more sophisticated way to compare PE returns to public equity by adjusting for timing differences. Instead of comparing a fund's internal rate of return (IRR) directly to a public index, PME methodologies hypothetically reinvest all cash flows into a public equity index and measure whether the PE fund beat that counterfactual investment.
Horizon Advisors' 2021 benchmark study analyzed 6,500+ PE funds using PME methodology. The result: 65% of PE funds underperformed their PME benchmark on a net-of-fees basis over 10+ year periods. In other words, most institutional investors in private equity would have achieved higher returns by simply investing in public equity instead. This does not mean PE offers no value—it means that PE value is concentrated in a minority of superior-performing funds, and that the average PE investor is better off in lower-cost public equity.
Related analysis on private equity secondaries and private equity vs. private credit has found that sophisticated allocators increasingly pursue secondaries and later-stage funds (which benefit from proven business models and lower entry multiples) rather than flagship buyout commitments. This shift acknowledges that the return premium is recoverable, but primarily for investors with skill in manager selection or access to off-market deal flow.
What about venture capital and growth equity?
The public equity vs. private equity comparison often conflates different asset classes. Venture capital and growth equity—which target early-stage and expansion-stage companies—behave differently from mature buyout funds.
Cambridge Associates' data shows that venture capital returned 14.3% net-of-fees over 1995–2022, materially above public equity. However, this is heavily skewed by a small number of mega-winners (e.g., Uber, Airbnb, Meta). The median venture fund underperformed public equity; the mean was pulled upward by outliers. This is a winner-take-all distribution that favors investors with exceptional manager selection ability or those who happen to back the next category-defining business.
Growth equity (later-stage VC investing in profitable, high-growth companies) returned 11.2% net-of-fees. This outperformance is more consistent and carries lower volatility than venture capital, making it more defensible for general allocators. For more on this segmentation, see the distinction between venture capital and buyout private equity.
What are the implications for long-term allocators?
The evidence suggests that the historical private equity return premium has not persisted into the 2010s and 2020s on a net-of-fees basis. For allocators reviewing portfolio construction:
Average funds underperform. If an allocator commits to average PE funds, they should expect returns comparable to or below public equity, particularly net of fees. This is not a reason to eliminate PE allocation entirely, but it is a reason to be skeptical of PE as a return driver.
Selection and access matter critically. The PE returns that do exceed public equity are concentrated in the top-quartile managers. These managers are often oversubscribed and may limit new capital. For an investor with below-median access to top-tier PE partnerships, public equity exposure is likely the more rational choice.
Diversification is the honest PE case. Rather than arguing for a return premium, PE's role in a long-term portfolio is lower correlation and portfolio risk reduction. This is mathematically valid but should be priced accordingly—investors should not pay 2% management fees and 20% carry for diversification benefits that are worth perhaps 50–100 basis points annually.
Liquidity constraints are real. PE's illiquidity is a feature for some institutions (e.g., perpetual endowments) and a bug for others (e.g., pension funds with benefit obligations). Allocators should match their PE allocation to their liquidity profile, not assume the return premium justifies any liquidity drag.
The institutional data is now clear: the case for private equity must rest on manager skill, portfolio diversification, and strategic access—not on a broad return premium over public equity. For allocators accepting this premise, the recent rebalancing at Stanford, CalPERS, and Harvard reflects rational response to persistent evidence, not a fad.