Buffett unleashes the ultimate Wall St. racket By: MarketWatch February 19, 2013 at 06:00 AM EST Berkshire Hathaway’s deal for Heinz is signaling an M&A revival, but investors should be cautious. Most of these deals don’t work as advertised. Read More >> Related Stocks: Bank of America Berkshire Hathaway Citigroup Goldman Sachs Group Hewlett-Packard Lazard Inc Microsoft Yahoo