Equity markets on Monday ended flat after opening nearly 0.5 percent higher amid selling seen in PSU stocks. The Sensex was up 17.39 points or 0.02 percent to close at 73,895.54, and the Nifty was down 33.15 points or 0.15 percent to end at 22,442.70. About 1,294 shares advanced, while 2,627 shares declined, and 172 shares were unchanged.