Berkshire Hathaway Inc (BRK.B)

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If you read only one Buffett post, make it this one and the link below:

"Buffett’s returns appear to be neither luck nor magic, but, rather, reward for the use of leverage combined with a focus on cheap, safe, quality stocks. Decomposing Berkshire's portfolio into ownership in publicly traded stocks versus wholly - owned private companies, we find that the former performs the best, suggesting that Buffett’s returns are more due to stock selection than to his effect on management."

To learn "How Buffett Did It" click...
http://www.econ.yale.edu/~af227/pdf/Buffett%27s%20Alpha%20-%20Frazzini,%20Kabiller%20and%20Pedersen.pdf