The Nikkei Stock Average rebounded in Tokyo morning trading on September 4, rising 555.26 points from the previous day to 64,769.74. SoftBank Group surged more than 7% and contributed roughly 300 points to the index after its U.K.-based chip-design subsidiary Arm Holdings rallied sharply in the U.S. on September 3. Buying also spread across artificial-intelligence and semiconductor shares, helped by lower long-term U.S. and Japanese bond yields after expectations for an early U.S. Federal Reserve rate hike receded. The advance contrasted with TOPIX, which fell 7.56 points to 4,094.48 as the yen strengthened to around 155.25 per dollar, weighing on exporters and trading companies. Investor focus is shifting to upcoming U.S. economic indicators and the Bank of Japan's monetary policy management, while the stronger yen remains a near-term headwind for automobiles and machinery.