S&P 500 Index Futures Trading Lower By: Benzinga via Benzinga July 21, 2015 at 11:11 AM EDT Joel Elconin is the co-host of Benzinga's #PreMarket Prep, a daily trading idea radio show. S&P 500 index futures were ... Read More >> Related Stocks: Apple Dow Jones Industrial Average (EOD) Exxon Mobil Facebook SPDR S&P 500 ETF Trust