S&P 500 Index Futures Trading Lower Again In Volatile Session By: Benzinga via Benzinga April 30, 2015 at 10:41 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