Japan downgrade, commodity falls hit US futures By: CNBC.com News December 01, 2014 at 06:11 AM EST U.S. stock index futures fell on Monday, as ratings agency Moody's downgraded Japan's credit rating and commodity prices continued to tumble. Read More >> Related Stocks: HSBC HOLDING PLC 8.125 ERPETUAL CAPITAL SECURITIES Sentinelone Inc Cl A