Japan's Nikkei Stock Average experienced fluctuations over the past few days, initially rising by 400 points due to gains in U.S. stocks. The index closed at 39,414 points, reflecting a 397-point increase. Advantest, a key player in the semiconductor testing market, raised its full-year operating profit forecast by 37%, driven by strong demand for its testing tools used in artificial intelligence applications. This positive outlook contributed to the upward movement in chip-related shares. On January 30, the Nikkei closed at 39,513 points, marking a gain of 99 points, while on January 31, it opened slightly higher at 39,574.38 points. The market continues to show resilience amid fluctuations in U.S. markets, with the S&P 500 closing 0.6% higher and the Nasdaq gaining 0.2% on the same day.