Theory (Richard A. Brealey - An Introduction to Risk and Return from Common Stocks) suggests that a 12 share portfolio can provide 90% of portfolio diversification benefit if each is in a different industry. With 5 shares, 77% of that benefit is achieved.
The following are direct quotes and present our case for a focused portfolio more eloquently then we could:
Warren Buffett: “If you are a know-something investor, able to understand business economics and to find five to ten sensibly-priced companies that possess important long-term competitive advantages, conventional diversification makes no sense for you. It is apt simply to hurt your results and increase your risk.” The Essays of Warren Buffett p80
Charles Munger: “We believe that almost all really good investment records will involve relatively little diversification. The basic idea that it was hard to find good investments and that you wanted to be in good investments, and therefore, you’d just find a few of them that you knew a lot about and concentrate on those seemed to me such an obviously good idea. And indeed, it’s proven to be an obviously good idea. Yet 98% of the investing world doesn’t follow it. That’s been good for us.” Berkshire Annual Meeting 2004
John Maynard Keynes: "As time goes on, I get more and more convinced that the right method in investment is to put fairly large sums into enterprises which one knows something about... It is a mistake to think that one limits risk by spreading too much between enterprises about which one knows little and has no reason for special confidence..."

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