IBM leads tech action as Buffett buys up shares By: MarketWatch November 14, 2011 at 12:59 PM EST Berkshire Hathaway’s CEO says his holding company has taken a 5.4% stake in software and services giant valued at $10.7 billion. Read More >> Related Stocks: Adobe Systems Amazon.com Apple Berkshire Hathaway Berkshire Hathaway Cisco Systems EMC Corp Groupon Cl A Hewlett-Packard International Business Machines Macy's Seagate Technology Plc