US stocks open lower as investors weigh Fed moves By: CNBC.com News September 16, 2014 at 09:30 AM EDT Stocks fell on Tuesday, with the S&P 500 extending declines into a third day, as investors mulled the timing of rate hikes by the Federal Reserve. Read More >> Related Stocks: FedEx Corp Genl Mills Lennar Corp Oracle Corp Rite Aid Corp Sentinelone Inc Cl A