US markets look ahead to Yellen's debut appearance By: CNBC.com News February 11, 2014 at 05:15 AM EST U.S. stock index futures ticked higher, ahead of Federal Reserve Chair Janet Yellen's first testimony before Congress. Read More >> Related Stocks: Apple CVS Health Corp Comscore Inc Google, Inc. Kellogg Co Mosaic Co Omnicom Group Sentinelone Inc Cl A