SLAM Exploration Ltd. (TSXV: SXL)
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As the founder of Microsoft, Bill Gates’s wealth story is widely known. However, the investment strategy of the Bill & Melinda Gates Foundation presents a style distinctly different from its tech-mogul founder.
According to the Foundation’s latest filings with the U.S. Securities and Exchange Commission (SEC), a substantial 59% of its approximately $38 billion public stock portfolio is concentrated in just three companies: Berkshire Hathaway (BRK.A) (BRK.B), waste management company WM (WM), and Canadian National Railway (CNR). This allocation profoundly reflects the investment philosophy of his longtime friend Warren Buffett, focusing on value enterprises with wide “moats” and stable cash flow generation.
1. Berkshire Hathaway (29.1% of Portfolio): The Continuation of Buffett’s Legacy
The Gates Foundation is one of the largest shareholders of Berkshire Hathaway, holding approximately 21.8 million Class B shares, currently valued around $10.9 billion. These shares primarily originate from Buffett’s annual directed donations. Although the donation terms require the foundation to utilize their full value within the year, the trust managers have chosen to retain a significant portion of the shares over the years.
Following Buffett’s retirement announcement in May 2025 and the official assumption of the Chairman role by Greg Abel on January 1, 2026, the market is closely watching how the new leader will steer this massive conglomerate with over $670 billion in investable assets and dozens of wholly-owned subsidiaries. Currently, Berkshire’s stock price has remained stable since Buffett’s retirement announcement, trading at a price-to-book ratio of around 1.5x. Its balance sheet is robust, and despite a setback from the California wildfires in early 2025, its core insurance business continues to generate strong overall cash flow.
2. WM (16.7% of Portfolio): The Absolute Dominant in an “Unremarkable” Business
WM (formerly Waste Management) is North America’s largest solid waste collection and disposal company. Its core competitive advantage lies in its network of over 260 landfills. The extremely high regulatory barriers to constructing new landfills create an almost insurmountable competitive moat. This forces many smaller waste haulers to contract with WM for disposal through its transfer stations and landfills.
Despite challenges like falling prices for recyclables, WM leverages its market-dominant position to consistently raise rates for households, businesses, and third-party haulers, driving revenue growth and improving operating margins. Recently, the company expanded into medical waste treatment by acquiring Stericycle (now WM Healthcare Solutions), aiming to create synergies with its existing operations. With an enterprise value to EBITDA (EV/EBITDA) ratio estimate of less than 14, its market valuation appears relatively reasonable.
3. Canadian National Railway (13.6% of Portfolio): The “Steel Artery” Spanning North America
Canadian National Railway boasts a rail network stretching from coast to coast in Canada down to New Orleans in the United States. This geographic coverage constitutes a powerful natural monopoly advantage. Although the industry overall experiences slow growth (average annual freight volume growth of just 1% from 2020-2024) and has been impacted by trade policies, the company has offset declines in some product shipments (like metals, minerals, forest products) by adjusting its freight mix (increasing petroleum & chemicals, grain, coal, fertilizers).
The high capital intensity and scale effects of the railroad industry create significant barriers to entry and have driven ongoing industry consolidation. Canadian National’s management generates strong free cash flow (up 14% in the first nine months of 2025) through strict control of capital expenditures, using it for share repurchases to boost earnings per share. Its current EV/EBITDA ratio of less than 12 makes it more attractively valued than peers, representing a classic long-term value stock that generates steady cash flow.
Core Insight: A Philosophy of Steady Value Investing
The Gates Foundation’s portfolio clearly demonstrates that its management focus is not on chasing the high-growth tech stocks that made its founder wealthy. Instead, it adheres to a Buffett value investing philosophy, deeply concentrating on industry leaders with simple, understandable business models, enduring competitive advantages, and reliable cash flow generation. This reflects a prudent strategy of preserving and growing assets to support the Foundation’s long-term philanthropic mission. With the transition from the Buffett era, the market will test the continuity of this philosophy in the new era.
