May 15 proved an exciting day for traders and stock market enthusiasts in general as numerous prominent investors disclosed the state of their portfolios – with all their most recent buys and sales – as of the end of the first quarter. Few of the filings are as exciting and interesting as those covering the holdings of one of the most successful investors in history, the Oracle of Omaha, Warren Buffett. His updated portfolio contains the stocks of 41 companies and is worth over $331 billion. Buffett’s large ...