Diversification investment is deadly to portfolios

Diversification investment is deadly to portfolios, Buffett: We diversify substantially less than most investment operations. We might invest up to 40% of our net worth in a single security under conditions coupling an extremely high probability that our facts and reasoning are correct with a very low probability that anything could drastically change the underlying value of the investment.

How Buffett Structures His Long-Term Investment Portfolio

In his 1996 shareholder letter, Buffett explained in great detail how he structured his long-term investment portfolio. Many of the contents of this letter have been quoted repeatedly so far, and it can be regarded as a very important shareholder letter.

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