Snapping four days of losses, the Sensex at the Bombay Stock Exchange climbed 268 points, or 1.4 percent, to 19,405, today, on value-buying in heavyweights. The Nifty at the National Stock Exchange rallied 78 points, or 1.4 percent, to 5,830. Stock markets in Japan, China, Hong Kong, Singapore and South Korea ended mixed.