US Stock Futures Tumble; Citigroup Earnings In Focus By: Benzinga via Benzinga January 15, 2015 at 07:24 AM EST Pre-open movers US stock futures traded lower in early pre-market trade, ahead of earnings from Citigroup Inc. (NYSE: C). Data on ... Read More >> Related Stocks: Adobe Systems Citigroup Eastern Company Groupon Cl A Lennar Corp Southwestern Energy Synalloy Cp