Berkshire Hathaway (BRK.A) filed the update on its U.S. stock portfolio as of the end of 2012 with the Securities and Exchange Commission on Thursday.
Berkshire says it held nearly 6 million ADM shares and 3.7 million Verisign shares at the end of the year. Those were the newest additions to Berkshire's $75.3 billion U.S. portfolio.
Many investors try to copy Buffett's moves. But this report doesn't distinguish between Buffett's stock picks and those made by the company's two other investment managers.