Why the Gates Foundation Puts 59% of Its $36 Billion Portfolio in Just 3 Stocks

The Bill & Melinda Gates Foundation Trust manages a $36.6 billion equity portfolio with a structure that would make most institutional investors uncomfortable. There are only 23 positions. Ninety-six percent of the assets sit in just 10 holdings. And the top three stocks-Berkshire Hathaway, Waste Management, and Canadian National Railway-comprise roughly 59% of the entire portfolio. Berkshire Hathaway alone accounts for 27.59%. This is not a diversified portfolio in the conventional sense. It is a concentrated bet on quality, built on the conviction that a few exceptional businesses can compound far better than a broad market index.

The thesis is simple: quality trumps diversification over long time horizons. The Gates Foundation's holdings read like a who's who of durable competitive advantages. Waste Management and Canadian National Railway are leaders in their respective industries with pricing power and scale that withstand economic cycles. Microsoft, the foundation's fourth-largest holding, is the company Gates himself built. But the largest position by a wide margin is not Microsoft-it is Berkshire Hathaway, the conglomerate built by Warren Buffett.

This concentration is no accident. It reflects the deep influence of a friendship that spans more than three decades. Gates and Buffett have been close friends since the 1990s, and Buffett has served as both sounding board and investing mentor to the Microsoft co-founder. The relationship is reciprocal: Buffett has pledged the bulk of his fortune to the Gates Foundation, and the foundation receives annual injections of Berkshire shares from Buffett himself. The foundation's portfolio managers have sold some Berkshire shares to fund operations. This is not a gamble. It is a disciplined approach to preserving and growing capital over decades.

The result is a portfolio that looks nothing like a typical endowment. It is lean, focused, and built on the same principles that made Buffett's name synonymous with long-term value creation. In a world where institutional investors often hide behind diversification, the Gates Foundation stands apart-willing to put a large portion of its wealth into just a few businesses it understands deeply. That is the essence of the value investor's craft.

Berkshire Hathaway: The Quintessential Moat Stock (27.6% of Portfolio)

At 27.59% of the portfolio, or $9.75 billion, Berkshire Hathaway is not merely the Gates Foundation's largest holding-it is a conviction bet of extraordinary magnitude. This single position exceeds the next four holdings combined. For a value investor, such concentration demands scrutiny: is this the disciplined application of a proven philosophy, or a friendship-driven anomaly? The evidence suggests the former.

Berkshire is the quintessential moat stock. Its strength lies not in a single business but in a diversified empire spanning insurance, energy, railroads, and manufacturing. This structure provides natural hedging; when one sector stumbles, others compensate. The core insurance business, in particular, generates the float that fuels Buffett's investing machine. Even under new CEO Greg Abel, the conglomerate retains its fundamental advantages: massive capital reserves, a culture of disciplined capital allocation, and pricing power inherited from decades of brand building. The foundation's managers have sold shares-2.36 million in both Q3 and Q4 of 2025-but these reductions appear to be routine liquidity events, likely tied to the foundation's spending requirements, rather than a loss of faith. The core position remains intact.

The valuation is undeniably high, trading at roughly 30 times forward earnings. By strict Graham-Dodd standards, this is expensive. Yet quality commands a premium, and Berkshire's moat is among the widest in existence. The justification lies in the compounding track record. Under Buffett's leadership for over six decades, Berkshire achieved a compound annual growth rate of 19.9% versus the S&P 500's 10.4%. That is the power of capital allocation at scale, compounded over an extraordinary time horizon. For a charity endowed to last centuries, that history of durable growth is worth paying for.

Recent share repurchases by Berkshire itself-over $70 billion between 2020 and 2024-demonstrate management's confidence in intrinsic value. The fact that buybacks have paused suggests Buffett and Abel see the market as fairly valued, not cheap. This discipline is reassuring; it means the foundation's holding is not propped up by a company artificially inflating its own worth. The stock is held because the underlying businesses are exceptional, not because of a temporary discount.

In the end, the Berkshire position is the anchor of a portfolio built for generational compounding. It reflects a belief that a few businesses with genuine, durable advantages will outperform a broad market index over long cycles. For the Gates Foundation, which must fund its mission for generations, this is not a speculative bet. It is the disciplined application of the same principles that built Buffett's legacy. The recent selling was noise. The holding is the signal.

Waste Management and Canadian National Railway: Hidden Compounders

If Berkshire Hathaway is the anchor of the Gates Foundation's portfolio, Waste Management and Canadian National Railway are the twin pillars that hold it steady. Together, these two holdings comprise 32.5% of the $36.6 billion portfolio-$6.36 billion in Waste Management and $5.12 billion in Canadian National Railway. Like Berkshire, both have been held for over a decade. WM: 17.98% of portfolio, held >10 years. CNI: 14.49% of portfolio, held >10 years. This is not a portfolio chasing quarterly momentum. It is a portfolio built for generational compounding.

Waste Management operates in what sounds like an unglamorous business-but that is precisely the point. The company has built a vertically integrated empire across North American waste collection and disposal, now operating over 250 landfills and 300 transfer stations. After acquiring Advanced Disposal in 2020, it now counts over 250 landfills and 300 transfer stations. The moat here is structural: regulatory and economic barriers make it extraordinarily difficult to build new landfills. This gives WM pricing power that most businesses can only dream of. When you control the endpoint for waste, customers come to you-not the other way around. The 2024 acquisition of Stericycle further extends its reach into specialized waste streams. This is the essence of a boring business done exceptionally well: recurring revenue, rising prices, and cash that compounds through acquisition.

Canadian National Railway operates a transcontinental network spanning Canada and the U.S. Midwest-a strategic infrastructure asset with limited competition. Railroads are natural monopolies in many corridors, and CN's network is one of the most valuable in North America. Like WM, it generates predictable cash flows regardless of economic cycles. The foundation has held CN for over a decade, riding out recessions and market turbulence, because the underlying asset does not disappear. CNI: 14.49% of portfolio, held >10 years.

What ties these three holdings together is the quality of the moat, not the glamour of the industry. Berkshire, Waste Management, and Canadian National Railway all possess durable competitive advantages that allow them to raise prices, withstand economic downturns, and compound capital over decades. For a charity endowed to last centuries, this is the core of the strategy: not speculation, not trend-chasing, but ownership of businesses that will still be strong when today's analysts are forgotten.

The recent share reductions in these positions-like the 2.36 million Berkshire shares sold in Q4 2025-were liquidity events, not conviction events. The foundation's managers have consistently held the core of these positions, allowing them to grow into the portfolio's anchor. That discipline is what separates this portfolio from the churn of institutional trading. It is a portfolio built on the belief that a few exceptional businesses, held for decades, will outperform a broad market index. That is the value investor's craft, and it is exactly what the Gates Foundation has assembled.

What This Means for Long-Term Investors

The Gates Foundation's portfolio offers a masterclass in disciplined, long-term investing-and the lessons extend far beyond charitable endowments. For individual investors building their own portfolios, the foundation's approach reveals something counterintuitive: sometimes less is more.

The foundation holds just 23 positions, with 96% of assets in only 10 holdings 96% of assets in 10 holdings. This is not reckless concentration-it is the disciplined application of a simple principle: ownership of exceptional businesses compounds far better than broad diversification over long horizons. The top three holdings-Berkshire Hathaway, Waste Management, and Canadian National Railway-comprise roughly 59% of the portfolio Berkshire 27.59%, Waste Management 17.98%, Canadian National Railway 14.49%. Each possesses a durable moat that withstands economic cycles and market turbulence.

But here is the insight that challenges conventional wisdom: Microsoft-the company Bill Gates co-founded-ranks only fifth at 10.52% Microsoft 10.52% of portfolio. This is not a slight against a great company. It is evidence of disciplined valuation. Even deep conviction does not justify an overweight position if the price is too high or the moat, while strong, is not exceptional relative to other opportunities. The foundation's managers have consistently applied this standard, holding businesses they understand deeply while resisting the emotional pull of familiarity.

The recent share reductions tell another important story. In Q4 2025, the foundation reduced Berkshire by 2.36 million shares reduced by 2.36 million shares and Microsoft by 1.5 million shares reduced by 1.5 million shares. These were not panic sales or conviction losses. They were calculated rebalancing events-likely driven by the foundation's spending requirements and the need to maintain portfolio discipline. The core positions remain intact, held for over a decade held >10 years. This is the difference between emotional trading and strategic capital allocation.

So what should individual investors take from this? Build a portfolio of 5 to 10 exceptional businesses you understand deeply. Identify companies with sustainable competitive advantages-moats that allow them to raise prices, withstand downturns, and compound capital over decades. Hold them through market turbulence. Let compounding work. Do not chase quarterly performance or sector trends. The Gates Foundation's portfolio is not a trading book; it is a generational endowment built on the belief that a few incredible companies, held for decades, will outperform a broad market index. That is the value investor's craft-and it is available to any investor willing to practice the discipline of concentration.