Yellen speech, bank earnings loom on Wall Street By: CNBC.com News July 15, 2014 at 05:11 AM EDT U.S. stock index futures pointed to a flat open on Tuesday, ahead of Federal Reserve Chair Janet Yellen's testimony before Congress. Read More >> Related Stocks: Citigroup Goldman Sachs Group Intel Corp JPMorgan Chase & Co Johnson & Johnson Sentinelone Inc Cl A Yahoo