When Warren Buffett and his team at Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) make an investment, the world pays attention.

There's good reason, too. Buffett has a long track record of outperforming the market. Since he took over as chief executive officer of the textile company in 1965, Berkshire Hathaway shareholders have seen the value of their stock increase at an annualized rate of 19.8%, double that of the S 500.

One of the best sources to find what Buffett and his investment managers, Todd Combs and Ted Weschler, are buying and selling is the quarterly portfolio disclosures with the Securities and Exchange Commission (SEC). Institutional investors managing over $100 million in assets must disclose their holdings at the end of every quarter, and Berkshire's stock was worth about $318 billion at the end of the third quarter.

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Source Fool.com