Buffett's firm adds Deere stake, ups bank holdings

But the report doesn't distinguish between Buffett's stock picks and those made by the company's other investment managers, Todd Combs and Ted Weschler. Combs started at Berkshire last year, and Weschler started early this year.

Combs and Weschler each manage roughly $4 billion. Berkshire's stock portfolio was worth about $75.3 billion at the end of September.

Buffett has said that investments smaller than $300 million are likely to be the work of Combs or Weschler. Many of the changes reported Wednesday would likely be Combs' or Weschler's investments because they are below $300 million.

Besides investments, Berkshire owns more than 80 companies; including insurance, utility, railroad, furniture, jewelry, manufacturing, restaurant and apparel companies. Berkshire's insurance and utility businesses typically account for more than half of his company's net income.

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Berkshire Hathaway Inc.: www.berkshirehathaway.com