How to own a triple-A portfolio By: MarketWatch November 17, 2011 at 00:00 AM EST Just eight companies have earned a triple-A rating, and those eight have delivered above-average returns with very low risk, says Ben Weiss. Read More >> Related Stocks: Automatic Data Processing Berkshire Hathaway Berkshire Hathaway Exxon Mobil General Electric Imperial Oil Limited Johnson & Johnson Microsoft