Tokyo stocks opened higher on Monday, driven by gains on Wall Street and easing concerns about U.S. tariffs. The Nikkei Stock Average futures rose by 0.45% in early trading, reflecting a positive start to the week. The Nikkei Stock Average itself advanced toward a four-day winning streak, buoyed by strong performances in the auto sector. Toyota Motor led the surge, up 5.5%, after revealing potential investments in Toyota Industries. The Nikkei was up 0.5% at 35,887.89 by midday, with the broader Topix index gaining 1%. Transport equipment stocks jumped 4.3%, making it the standout performer among the Tokyo Stock Exchange's 33 industry sectors. Asian currencies and shares showed cautious optimism as investors weighed U.S. economic data and ongoing trade tensions with China. Emerging-market currencies started the week cautiously, focusing on U.S. trade talks with key Asian economies and awaiting a slew of U.S. and Chinese economic data. Notable decliners included chip-testing equipment maker Advantest, a Nvidia supplier, which tumbled 5.4% after its profit forecast trailed analysts' estimates.