Bill Ackman's "Lazy Investor" Critique Revisited: Is a Concentrated Portfolio the Right Move for Most Investors?

Billionaire Bill Ackman has become one of the most influential and closely watched investors on Wall Street. Not only does he frequently post about the stock market and politics to his 1.8 million followers on X, he also runs Pershing Square Capital Management's roughly $12 billion equities portfolio.Pershing's stock portfolio is heavily concentrated in about a dozen names. It's common to hear the benefits of a well-diversified portfolio, but Ackman has equated this strategy to a form of laziness for investors who simply haven't done the work to confidently understand what they're buying. While Ackman's fund has done well, is a concentrated portfolio like Pershing's really the best move for most investors?Here is what Ackman said about diversification at a speech in 2010:Continue reading

Jun 12, 2025 - 16:43
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Bill Ackman's "Lazy Investor" Critique Revisited: Is a Concentrated Portfolio the Right Move for Most Investors?

Billionaire Bill Ackman has become one of the most influential and closely watched investors on Wall Street. Not only does he frequently post about the stock market and politics to his 1.8 million followers on X, he also runs Pershing Square Capital Management's roughly $12 billion equities portfolio.

Pershing's stock portfolio is heavily concentrated in about a dozen names. It's common to hear the benefits of a well-diversified portfolio, but Ackman has equated this strategy to a form of laziness for investors who simply haven't done the work to confidently understand what they're buying. While Ackman's fund has done well, is a concentrated portfolio like Pershing's really the best move for most investors?

Here is what Ackman said about diversification at a speech in 2010:

Continue reading