Warren Buffett Urges Investors to Use Low-Cost S&P 500 Index Funds

Warren Buffett, Chairman and CEO of Berkshire Hathaway, continues to advocate for ordinary investors to avoid picking individual stocks in favor of low-cost index funds. This long-term strategy gained renewed attention in July 2026 as market data confirms the historical effectiveness of his approach relative to high-fee professional management.

In a 2013 shareholder letter, Buffett instructed his estate's trustee to allocate 10% of cash to short-term government bonds and 90% to a low-cost S&P 500 index fund, specifically suggesting a Vanguard offering. Buffett argues that investors who remain realistic about their own shortcomings are more likely to obtain better long-term results than knowledgeable professionals who are blind to their weaknesses. He believes this disciplined approach yields results superior to those attained by most investors using high-fee managers.

Supporting data from Standard & Poor's demonstrates the efficacy of this strategy, showing that over 85% of large-cap mutual funds underperformed the S&P 500 over the last 10 years. The financial impact for individual investors is substantial; for example, a $5,000 investment in the Vanguard S&P 500 ETF following the 2014 release of the letter would be worth $20,465 today, or $25,270 if dividends were reinvested. This performance highlights the cumulative benefit of low fees and broad market exposure over active stock selection.