In July, August and September, Buffett's investment firm bought $20 billion in stocks, a significant increase from the second quarter, when Berkshire Hathaway bought $3.6 billion in stocks and the first quarter, when the firm spent $1 billion, CNNMoney reported Monday.
Buffett's biggest shopping day for the third quarter was the first day of trading after Standard & Poor's cut the U.S. credit rating, for the first time ever, from a triple A rating to AA+.
The S&P 500 index dropped more than 6 percent, which Buffett said later was "like buying on sale."
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