U.S. markets ended a volatile session along the flatline on Wednesday despite gains from IBM that lifted the overall technology sector. The Dow Jones Industrial Average fell 10 points, or less than 0.1%. Earlier in the day, the Dow was up more than 120 points. The S&P 500 added less than 0.1%. it also reached an intraday record. The Nasdaq Composite notched an intraday all-time high as well, advancing 0.1%.