The tech-heavy Nikkei ended the day down 0.14% at 50,842.93, after earlier rising as much as 1.18% to a one-week high of 51,513.16. The broader Topix eked out a 0.13% gain to 3,321.58. Artificial intelligence-related shares led the Nikkei's early advance after Wall Street peers rallied overnight amid optimism for an imminent end to the But the momentum ebbed in the afternoon, and the benchmark index was down as much as 0.65% at one point.Live Events "There's no single, big driving force" for stock gains, ...