US stocks on edge as eyes fix on Yellen By: CNBC.com News February 24, 2015 at 06:06 AM EST U.S. stock index futures signaled a flat open on Tuesday, as investors await hints on the timing of a rate rise at Fed Chair Janet Yellen's speech. Read More >> Related Stocks: Boston Beer Company Comcast Corp First Solar Hewlett-Packard Newfield Exploration Sentinelone Inc Cl A Toll Brothers Inc