(Bloomberg News) Warren Buffett, the billionaire investor who has highlighted his record of beating the market when stocks languish, oversaw a decline last year as the Standard & Poor's 500 Index ended unchanged.

Buffett's Berkshire Hathaway Inc. slipped 4.7 percent in 2011. It was the second time since 1990 that the Omaha, Nebraska-based firm underperformed an S&P 500 that had either declined for the year or rose less than 5 percent. Berkshire gained about 17-fold in the 21-year period, while the index has nearly quadrupled.

"There's going to be a big asterisk by this year," said David Rolfe, chief investment officer of Berkshire investor Wedgewood Partners Inc. "In tough markets it's a strong performer. There's no doubt it has broken the mold this year," he said in an interview last month.

Buffett's personal holdings of Berkshire lost about $2 billion last year. In September, the 81-year-old Buffett initiated the first share-repurchase program in four decades as Berkshire's chief executive officer. On a quarterly average basis, the stock price slipped in the three months ended Sept. 30 to the lowest relative to book value in more than 20 years.

The firm faced a surge in insurance claims tied to natural disasters and losses on a portfolio of speculative derivatives. The resignation of Berkshire manager David Sokol in March raised questions about succession for Buffett.

"Berkshire stock went to a price we never thought," Vice Chairman Charles Munger said on July 1 after the firm slipped 3.6 percent in the first six months of the year compared with a 5 percent rise in the S&P.

Insurance Losses

Munger cited Berkshire's insurance losses tied to the March earthquake and tsunami in Japan. Jay Gelb, an analyst with Barclays Plc, said in May that "succession risk is elevated" following Sokol's exit. On Aug. 9, Gelb raised his rating on Berkshire stock to "overweight" from "neutral," saying the stock slide provided a buying opportunity. The shares have gained 5.2 percent since.

Berkshire was one-thirtieth the size it is now based on book value, when in 1990 it dropped 23 percent, compared with the 6.6 percent slide in the S&P 500. Since then, the S&P 500 has posted five annual losses and three advances of less than 5 percent. Berkshire beat the index in each of those eight years, except for 2005 when the company gained less than 1 percent compared with a 3 percent rise in the S&P 500.

"Our defense has been better than our offense," Buffett said in the letter accompanying the 2009 annual report. Buffett, who highlights book value as a measure of performance rather than stock gains, said his firm has "consistently done better than the S&P" in years when the index has fallen.

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