Nikkei 225 to reduce Advantest's weighting from October

Key facts

• Advantest's weighting in the Nikkei 225 will be reduced starting October 1.
• The adjustment is due to Advantest's index share exceeding the 10% cap rule.
• The decision was based on Advantest's July 31 closing price.
• Advantest's price adjustment factor will be lowered from 7.2 to 6.4.
• The capping rule was previously applied to Fast Retailing and Advantest.

Nikkei will reduce the weighting of Advantest in the Nikkei 225 index from October 1, implementing a cap designed to prevent any single constituent from becoming overly dominant. Based on the stock's July 31 closing price, Advantest accounted for 12.2% of the index, surpassing the 10% threshold that triggers the cap rule introduced in 2022. Consequently, Advantest's price adjustment factor will be lowered from 7.2 to 6.4 starting in October. This capping rule has previously been applied to Fast Retailing in autumn 2024 and spring 2025, and Advantest itself was also subject to the rule during the index's spring review this year. Further adjustments or removal of the cap will be decided in connection with semiannual reviews following next spring.