Tokyo's Nikkei stock index jumped 3.01 percent Wednesday as bargain buying and a weaker yen lifted the Japanese market, following a rise on Wall Street bolstered by strong US corporate earnings. The benchmark Nikkei 225, which tumbled 7.3 percent last week, added 420.87 points to finish at 14,417.68, while the Topix index of all first-section shares tacked on 2.68 percent, or 30.46 points, to 1,166.55.