Markets ended higher today after a dismal start, buoyed by an ascendant energy sector, the Wall Street Journal reports. The seesaw comes as no surprise to one strategist: “This market is highly vulnerable to get pushed around right now. That’s a factor of light volume.” The Dow, once down 50, finished up 61.22 at 9,279.16. The S&P 500 rose 6.79 to 996.46. And the Nasdaq tacked on 13.32, to 1,969.24.