Warren Buffett Tweaks $58 Billion Portfolio

Billionaire Warren Buffett's company has reduced its holdings in Johnson & Johnson (JNJ), Proctor & Gamble (PG), ConocoPhillips (COP) and Exxon Mobil (XOM) during the last three months of 2009. Berkshire Hathaway (BRK.A) disclosed those investments and several other changes to its roughly $58 billion U.S. stock portfolio in documents filed with the Securities and Exchange Commission on Tuesday. The filing offers a snapshot of the Omaha-based company's holdings as of Dec. 31.