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.

The companies Buffett owns more than 20%

There are no technology stocks in the list of companies in which Buffett holds more than 20% of his shares. Why? What is the commonality? The significance of holding more than 20% of shares, several cases of Buffett holding large shares

Why Modern Portfolio Theory Unreasonable?

Why Modern Portfolio Theory Unreasonable? The inventor himself did not use it. I should have computed the historical covariance and drawn an efficient frontier. Instead I visualized my grief if the stock market went way up and I wasn’t in it – or if it went way down and I was completely in it. My intention was to minimize my future regret, so I split my [retirement pot] 50/50 between bonds and equities.

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