US STOCKS-Wall St ends almost flat as Bernanke warns on "cliff" By: Reuters: Company News December 12, 2012 at 16:55 PM EST * Dow off 0.02 pct; S&P 500 up 0.04 pct; Nasdaq off 0.3 pct Read More >> Related Stocks: Aetna Berkshire Hathaway Wal-Mart Stores, Inc.