TOKYO — Nikkei announced on July 31, 2026, that it will lower the weighting of semiconductor equipment maker Advantest in the Nikkei 225 index starting October 1, 2026. This adjustment follows Advantest's share in the index reaching 12.2% based on the closing price on July 31, surpassing the 10% cap rule introduced in 2022 to prevent any single stock from becoming overly dominant.
To implement this, Nikkei will reduce the price adjustment factor applied to Advantest shares from the current 7.2 to 6.4. The Nikkei 225 index is calculated by multiplying constituent share prices by such adjustment factors, which reflect past capital changes.
This capping rule was first applied in autumn 2024 to Fast Retailing and was also applied to Advantest during the index's spring review earlier in 2026.
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