 I'm Jessica Ettinger, CNBC. Markets were mixed today on Wall Street. The S&P 500 index and the NASDAQ pulling back from record highs as investors sold off high-flying big tech stocks. NVIDIA shares were down 5%, but the Dow notched a second winning day in a row. The Dow was up 32 points. The S&P 500 index down 49 points. The NASDAQ plunged 364 points, just about 2%.