What Institutions Have Known for Decades: The Yale Endowment Story

In 1985, Yale University’s endowment stood at $1.3 billion. It was invested roughly the way you might expect a conservative institution to invest: mostly domestic stocks, bonds, and cash. It resembled a very large version of a typical 60/40 portfolio.

Then a 31-year-old former bond trader named David Swensen took the job of chief investment officer and changed everything.

By the time Swensen died in May 2021, Yale’s endowment had grown to $42.3 billion. Over his 36-year tenure, his investment decisions generated $57.6 billion in gains for the university. In his final year alone, the endowment returned 40.2%, one of the highest single-year returns in its history. A dollar invested at the start of his tenure would have grown to nearly $103 by the end. A dollar invested in the S&P 500 over the same period would have grown to just over $50.

Source: Yale University News, October 2021, ‘David Swensen’s Coda’; Yale Endowment Office data.

The strategy that produced those results was not a secret. Swensen wrote two books about it. He gave interviews about it. He trained a generation of investment professionals who spread similar approaches across the institutional world. And for decades, the core insight has been right in front of us.

Most investors just were not paying attention.

The conventional wisdom in investment management for most of the twentieth century held that liquidity was desirable. Being able to sell quickly and easily was viewed as a good thing. Swensen argued the opposite.

Liquidity is a feature that markets price. Investors who demand it pay for it through lower expected returns. Investors who do not need it, and who can afford to be patient, can collect what academics call the illiquidity premium: the additional return that markets offer to investors willing to lock up capital for years at a time.

For a university endowment with a perpetual time horizon, no need to meet quarterly redemptions, and no pressure to show quarterly performance numbers, demanding liquidity made little sense. So Swensen systematically moved Yale away from public market securities and toward private equity, private credit, real assets, and venture capital.

Measured against the traditional 60/40 portfolio, Yale outperformed by 4.0% per year compounded over Swensen’s full tenure. That gap, sustained across decades, is what turned $1.3 billion into $42.3 billion.

Source: Yale University News, October 2021.

Source: Yale Endowment Office; Yale University News, October 2021.

The Yale Model did not simply mean buy anything illiquid. It meant building concentrated positions in some of the best private equity and venture capital managers in the world, often before those managers had established track records.

Swensen’s team invested with firms like Sequoia Capital and Kleiner Perkins in their early years. They backed real assets including timber and real estate at a time when most institutions were not. They made large allocations to absolute return strategies run by managers who could generate genuine alpha, not just market exposure in disguise.

Crucially, Swensen was explicit that manager selection was not a secondary consideration. By Yale’s own calculations, only 40% of the fund’s outperformance came from asset allocation decisions. The remaining 60% came from identifying and accessing better managers than anyone else was using.

Source: Chronograph, ‘The Evolution of the Yale Model for Institutional Investing,’ December 2025, citing Yale endowment calculations.

This is why the Yale Model, for all its elegant simplicity, proved difficult to replicate. Harvard, Princeton, MIT, and dozens of other institutions tried. Some succeeded modestly. Many did not. The model was not a formula you could follow blindly. It was a framework that required genuine skill in manager selection, deep relationships with top funds, and a genuine willingness to be patient.

For two decades, the endowment model delivered exceptional results. Private equity and venture capital allocations consistently outperformed public markets, the illiquidity premium was real and substantial, and institutions with meaningful alternatives allocations pulled away from those without them.

More recently, the picture has become more nuanced. As the strategy proliferated, capital poured into private equity and venture capital, fund sizes grew, and returns in some segments compressed. The spectacular run of U.S. public equities, particularly the Magnificent Seven technology stocks, made it harder for private assets to demonstrate clear outperformance in every calendar year.

Brad Gerstner, founder of Altimeter Capital, has been candid about this tension from the other side. Running a crossover fund that invests in both public and private technology companies, he has watched some of the most consequential private companies of the AI era, including Anthropic and OpenAI, raise capital at valuations that were difficult to underwrite at the time. In a 2024 conversation with fellow investor Bill Gurley, he admitted that he had sat out those investments despite thinking he might be missing the biggest thing in the world. That kind of honest reckoning with opportunity cost is exactly what the illiquidity premium demands: committing when others hesitate and staying patient when the market moves against you.

Source: Brad Gerstner and Bill Gurley, BG2Pod, January 2024.

The appropriate response to the model’s evolution is not to abandon the framework. It is to be selective within it. The core principle, that patient capital with a long time horizon deserves to earn more than capital demanding daily liquidity, remains as valid today as it was in 1985.

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