Nikkei announced on Thursday that it will revise the rules governing its Nikkei 225 index by creating a new 'information and communications' sector for constituent selection, effective October 1, 2026 [1]. This change follows a consultation process conducted in May and June, during which feedback was collected and considered before finalizing the new rules [1].
The revision involves renaming the existing 'communications' category in the Nikkei industry classification to 'information and communications,' and moving IT-related stocks from the services category into this new grouping [1]. Additionally, the new rules introduce procedures for replacing constituents within the same sector, aiming to maintain sector balance and avoid excessive concentration in any one area [1].
With this change, the number of sectors in the Nikkei 225's industry classification will increase from six to seven, consolidating all stocks classified under the 'information and communications' category into the new sector [1]. These adjustments will be reflected in the Nikkei 225's regular review scheduled for this autumn [1].
The Nikkei 225 is a stock index comprising Japan's leading 225 companies, and its constituent selection methodology groups 36 subcategories, such as banks and automobiles, into broader sectors like financials and technology [1]. The introduction of the new sector is intended to better represent the evolving structure of Japan's equity market [1].
CONCLUSION
The Nikkei 225's introduction of an 'information and communications' sector marks a significant update to its index methodology, reflecting changes in Japan's corporate landscape. These rule changes, effective October 1, 2026, are expected to enhance sector representation and maintain balance within the index.