The authors trace how the U.S. evolved into a nation of investors through retirement policy, mutual funds, and ETFs that expanded access to financial markets. The paper highlights that more than half of U.S. households now own investment funds, illustrating how decades of policy and product innovation have transformed investing from a niche activity into a cornerstone of middle-class wealth building.
The United States at 250: A Nation of Investors
ICI
Sarah Holden, Michael Bogdan
Research
6 Pages
Key Takeaways
Investor Ownership Expanded: 76 million U.S. households, representing roughly 130 million individual investors, now own mutual funds or ETFs, giving more than half the country a stake in capital markets.
Retirement Fueled Growth: IRA assets have grown to more than $18 trillion, while U.S. mutual fund assets increased from $51.3 billion in 1976 to over $32 trillion in 2026.
Markets Became Mainstream: Nearly 58% of U.S. households now own stocks, investment companies manage more than $47 trillion, and the U.S. retirement system is approaching $50 trillion in assets.
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