Nike NKE.N shares tumbled after HSBC downgraded the stock to "hold". By Sinéad Carew Jan 10 (Reuters) - U.S. stocks ended down but well off their lows of the day, with the Nasdaq staging a furious comeback late in the session as some investors appeared to be hunting for bargains even as they worried about rising interest rates. Along with watching rising bond yields, investors are also anxiously awaiting this week's inflation data and what it will mean for U.S. Federal Reserve monetary policy tightening, according to Peter Tuz, president of Chase Investment Counsel in Charlottesville, Virginia.