S&P 500 Index Futures Trading Lower In Volatile Trading By: Benzinga via Benzinga May 05, 2015 at 10:33 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 trading ... Read More >> Related Stocks: SPDR S&P 500 ETF Trust