The Agony & The Ecstasy: The Risks and Rewards of a Concentrated Stock Position

J.P. Morgan Asset Management

Research

46 Pages

J.P. Morgan examines the long term risks and rewards of concentrated stock ownership, arguing that even exceptional businesses face disruption, competition, and permanent decline. The paper highlights how roughly 40% of Russell 3000 stocks suffered unrecovered 70% declines since 1980, while only a small minority generated outsized wealth creation.

Key Takeaways

Catastrophic Loss Frequency: Around 40% of Russell 3000 stocks experienced permanent 70%+ declines since 1980, with Technology at 57% and Telecom at 51%.
Most Stocks Underperform: The median stock underperformed the Russell 3000 by 54%, while nearly two thirds of all stocks lagged the index over their lifetimes.
Diversification Often Helped: oughly 74% of concentrated holders would have benefited from diversification after accounting for volatility, catastrophic loss risk, and long term underperformance.
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