46 Firms Drove Half of 100 Years' Stock Market Wealth
Research by Hendrik Bessembinder analyzing the period from 1926 to 2025 reveals significant concentration in stock market returns, with only 46 firms generating half of the total wealth. While the weighted average return across nearly 30,000 stocks was substantial, the median stock actually returned a negative 6.9%. The study confirms the stock market's immense long-term wealth-building capacity, generating $91 trillion over the century. However, Bessembinder cautioned investors about extreme short-term volatility, contrasting it with the consistent, albeit lower, returns of government bonds.
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Research spanning a century reveals that a small handful of companies were responsible for generating half of the total wealth created by the stock market between 1926 and 2025. This study highlights significant concentration in market returns, even as the overall market showed substantial growth.
Market Concentration: The Power of a Few Stocks
Stock market observers frequently note that returns are often driven by a small group of mega-cap stocks. This pattern is not new; historically, a few major players tend to dictate market performance, rather than the market rising uniformly.
According to research from Hendrik Bessembinder, a professor at Arizona State University's Carey School of Business, this concentration is a long-standing trend:
Timeframe: 1926 through 2025.
Market Performance: The weighted average return across nearly 30,000 stocks exceeded 30,000%.
Median Return: Despite the massive overall gains, the median stock returned a negative 6.9%.
Wealth Concentration: Crucially, just 46 firms accounted for half of the total wealth generated by the stock market over the past century.
Implications for Investors
Bessembinder noted that the data suggests two contrasting views for the average investor:
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High Reward Potential: Some may interpret this as evidence of enormous wealth creation possible by correctly identifying top-performing stocks.
High Difficulty: Others may view stock picking as an extremely challenging endeavor, akin to finding needles in a haystack.
Long-Term vs. Short-Term Market Risks
Despite the concentration of gains, the study offers key insights into the nature of long-term investing:
Long-Term Growth: Over the last century, the broad stock market generated an estimated $91 trillion in wealth for investors.
Historical Returns: A value-weighted portfolio of all common stocks yielded a return equivalent to $15,401 for every dollar invested over the 100-year period.
Comparison to Bonds: For context, a $1 investment in U.S. Treasuries (considered a low-risk asset) would have yielded $25.34 over the same period.
Volatility Warning: Bessembinder cautioned that the short term is highly volatile, stating, "The stock market could drop 50% in less than a year."
Conclusion: However, he concluded that "In the long run, the stock market's been a tremendous wealth-building machine for investors."
Key Takeaways for Investors
The research suggests that the highest performers over the century were stocks that remained in operation for nearly the entire 100-year sample, benefiting significantly from the power of compounding interest. Examples of such long-tenured performers cited include:
Altria (formerly Philip Morris)
Vulcan Materials (industrial firm)
IBM (which initially developed punch-card systems)
