Historical cash-index close — 15 September 2026. Nikkei’s official daily-data archive confirms the original close of 63,484.10 index points. Its September 14 close was 63,492.99 points, giving a decline of 8.89 points. The percentage is approximately −0.014%, or −0.01% rounded to two decimal places.
| 15 September open | 63,190.37 points | Daily data; select September 2026 |
|---|---|---|
| 15 September high / low | 64,101.00 / 63,067.18 points | Official OHLC table |
| 15 September close | 63,484.10 points | Official OHLC table |
| 14 September close | 63,492.99 points | Previous session in the same table |
| Original collection | 15 September, 14:18 IST (08:48 UTC) | Preserved collection record; not the index’s closing-auction time |
What the comparison means
The calculation is (63,484.10 − 63,492.99) ÷ 63,492.99 × 100. It describes the change between two cash-index closes, not every constituent’s return and not a futures settlement. The original prices were matched to the September table rather than replaced by the administrator’s current display.
Construction and evidence limits
Nikkei’s profile identifies a price-weighted index of 225 Tokyo Stock Exchange Prime Market stocks. This review did not verify which company, currency move or economic release caused that day’s small decline. The earlier generic watchlist has been removed rather than presented as a reported explanation.
Archive clarification — 17 October 2026: The historical OHLC figures and previous close were checked against Nikkei’s September 2026 archive. The headline now names the session and unit, and the body separates the collection time from the close. No historical price or date field was changed. The original URL, publication and modification date fields, image assignment and byline are unchanged. This is a correction of the historical report, not a new market update. Source review recorded at . The review was AI-assisted; no independent human editorial approval is claimed.