Stocks entering the Nikkei 225
Every addition to the index behind 1321.T, 1330.T, EWJ over the last two years: when it took effect, who it replaced, and how the stock traded 1 week, 1 month, 3 months, 6 months and 1 year after the effective close.
The register
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Losses are entered in red. A blank cell means that window hasn't elapsed yet.
How Nikkei 225 additions work
Nikkei reviews constituents in April and October; results are typically announced in March and September. Stocks may also be removed ad hoc on delisting or designation to the liquidation post. A change is announced first and only takes effect after the close on the effective date. Between those two dates, every fund tracking the index (1321.T, 1330.T, EWJ) has to buy the incoming stock, which is why the window matters to traders.
What happens to a stock after it joins Nikkei 225
Inclusion is often described as a guaranteed pop. The tracked history is more mixed: . Returns are measured from the effective close and can also be viewed against the index itself, so a rising market doesn't get counted as an inclusion effect.
When are Nikkei 225 changes announced?
Semi-annual reviews (April / October) + extraordinary deletions. Scheduled review, announcement and effective dates for the next twelve months are listed on the index review calendar. Ad hoc changes — a takeover, a bankruptcy, a fast-track promotion — are announced outside that schedule, usually with a few days' notice.