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