CNBC | S&P, Nasdaq rise as tech rallies; oil eyed CNBC U.S. stocks traded mostly higher on Wednesday as investors digested remarks from Fed Chair Janet Yellen, as well another choppy trading in oil. "It's a welcomed relief, especially after these past few weeks," said Jon Adams, senior investment ... Yellen: Oil bust aids US economy North American stock markets search for direction Wall Street up as Yellen eases concerns about economy |