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Endowments & Foundations: Reframing Private Markets

Reported by Mercer
Oct 21, 2025· 2 min read
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Key Takeaways
  • • Endowments and foundations maintain private markets allocations at 30% or higher in portfolios, underpinned by long-term structural advantages including illiquidity premiums, diversification benefits, and exposure to growth drivers, despite recent performance headwinds.
  • • Recent vintages (2019–2021) in private equity and real estate have experienced pronounced distribution slowdowns and valuation recalibrations, creating pressure on liquidity assumptions that institutions previously relied upon for cash flow planning.
  • • The long-term return premium across private equity, private debt, real estate, and infrastructure remains intact, though earlier vintages continue to validate historical performance expectations while newer vintages face recalibration.
  • • Institutions must re-underwrite private market programs dynamically, stress-testing liquidity assumptions and distribution forecasts, as the current cycle has exposed over-reliance on prior vintage performance patterns and revealed inconsistent year-to-year returns driven by abnormal distribution cycles.
Summary
Private markets remain a foundational component of endowment and foundation portfolio construction, with allocations frequently reaching 30% or higher, according to Mercer's analysis. These positions have been built on a philosophy centered on capturing illiquidity premiums, enhancing diversification across asset classes, and gaining exposure to structural growth drivers. However, several years of headline volatility, muted cash distributions, and heightened investor scrutiny have prompted institutional allocators to reassess their private markets strategies and the role these assets should play in forward-looking portfolio construction amid macroeconomic uncertainty and shifting liquidity dynamics.

The investment case for private markets remains fundamentally sound, though the execution framework requires refinement. While recent vintages—particularly 2019–2021 private equity and real estate allocations—have experienced slower distribution profiles and valuation recalibrations, performance data across multiple time periods supports the persistence of long-term return premiums. Earlier vintages have continued to meet or exceed modeled expectations, suggesting that performance cycles are inherent to private markets and that the structural advantages underlying these allocations remain intact. However, the distribution slowdown in recent vintage cohorts signals that new underwriting assumptions are necessary.

The central challenge facing institutions is that private markets programs have demonstrated inconsistent annual returns driven partly by abnormal distribution patterns, revealing that many endowments and foundations have relied too heavily on liquidity assumptions borrowed from prior vintage performance that no longer hold true. Going forward, institutions must adopt more dynamic approaches to private market portfolio management, including rigorous stress-testing of assumptions around distributions and liquidity availability. This re-underwriting process is essential for aligning private markets programs with current market realities and ensuring that cash flow projections and portfolio construction decisions reflect current vintage performance characteristics rather than historical patterns.

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Mercer Endowments & Foundations: Reframing Private Markets