Direct Answer
The JPX-Nikkei Index 400 is a rule-based measurement of 400 Japanese equities selected for return on equity, operating profit, and market capitalisation criteria, maintained by Japan Exchange Group and Nikkei. Like every index it owns nothing: it is a number produced by applying a published weighting formula to a selected list of securities, revised on a schedule the provider sets.
What this index covers
The JPX-Nikkei Index 400 covers 400 Japanese equities selected for return on equity, operating profit, and market capitalisation criteria. Japan Exchange Group and Nikkei defines which securities are eligible, how they are selected from that pool, and how much each one contributes to the published number.
The methodology document, published by Japan Exchange Group and Nikkei, sets the rules for inclusion and removal. Corporate actions, index reviews, and eligibility changes all move the constituent list on the timetable the provider specifies.
How constituents are weighted
Swoopr has not verified the weighting method for this index against Japan Exchange Group and Nikkei's current methodology document, so none is stated here rather than guessed. The provider link below is authoritative.
Current JPX-Nikkei Index 400 constituents
Japan Exchange Group and Nikkei publishes and licenses the JPX-Nikkei Index 400 constituent list. Swoopr does not republish it here. The provider's own page is the authoritative source for current membership and weights.
Japan Exchange Group and Nikkei: official JPX-Nikkei Index 400 page
Related reading
- All stock market indexes: how indexes are built, weighted and revised.
- Asia-Pacific indexes: others covering the same region.
- Index concentration: measuring how much of an index sits in its largest holdings.
- Index rebalancing and inclusion effects: what happens to a stock when index membership changes.
Frequently Asked Questions
Who maintains the JPX-Nikkei Index 400?
Japan Exchange Group and Nikkei maintains the JPX-Nikkei Index 400 and publishes the methodology document that defines its eligibility and weighting rules.
What does the JPX-Nikkei Index 400 measure?
It measures 400 Japanese equities selected for return on equity, operating profit, and market capitalisation criteria. The index is a calculated number applying a weighting formula to a selected list of securities, and it holds nothing itself.
Where can I see the current JPX-Nikkei Index 400 constituents?
Japan Exchange Group and Nikkei publishes the current constituent list. Swoopr does not republish it, because index providers license constituent data and Swoopr holds no such licence.