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."

https://www.forbes.com/sites/timworstall/2013/12/03/the-academic-paper-that-explains-warren-buffetts-investment-success/#529472332dd8