Core Insights - Bill Gates' investment strategy is heavily concentrated, with 79% of the Gates Foundation Trust's $48 billion portfolio invested in just four stocks, contrasting with the common advice of diversification [2][5] Group 1: Portfolio Composition - Microsoft is the cornerstone of Gates' holdings, comprising about 27% of the portfolio, with over 26 million shares valued at approximately $13 billion [2] - Berkshire Hathaway accounts for roughly 25% of the portfolio, benefiting from its diverse business mix and strong cash flow [3] - Waste Management represents 15% of the portfolio, providing reliable income and growth through sustainable waste-to-energy projects [4] - Canadian National Railway makes up about 12% of the portfolio, offering consistent dividends and a strong economic position [4] Group 2: Investment Philosophy - The Gates Foundation focuses on large, stable companies with proven track records and dividends that support its charitable activities [5] - Concentration in a few durable businesses is seen as a strategic choice rather than recklessness, reflecting confidence in their long-term viability [5] - Gates' substantial net worth, exceeding $100 billion, provides a safety net that allows for this concentrated investment approach without the same risks faced by average investors [6]