TOKYO, 16 September 2026 — TOPIX started Wednesday at 4,056.77, a rise of 19.61 points, or 0.49%, compared with its 4,037.16 close on 15 September. Yahoo Japan’s 10:00 JST observation showed the broad Japanese benchmark at 4,069.99, up 32.83 points, or 0.81%, from that reference.
From the opening to the first-hour reading
| Tuesday’s final close | 4,037.16 points |
|---|---|
| Wednesday open, 09:00 JST | 4,056.77 points |
| Opening gap, calculated | +19.61 points / +0.49% |
| Reported level, 10:00 JST | 4,069.99 points |
The later observation was 13.22 points above the opening print. Unlike a report that simply labels every positive quotation a gap-up, these figures distinguish the overnight gap from the additional movement after trading began. The opening values were cross-checked between Yahoo Japan and Investing.com; the 10:00 reading is attributed to Yahoo Japan rather than represented as an exchange-certified closing value.
How this changes the two-session comparison
Tuesday’s decline had taken TOPIX from Monday’s 4,058.21 close to 4,037.16, a loss of 21.05 points. Wednesday’s opening alone recovered most, but not all, of that loss. By the cited 10:00 observation, the index was 11.78 points above Monday’s closing level. Those comparisons describe observed prices, not a prediction that the recovery will persist.
JPX defines TOPIX using free-float-adjusted market-capitalization weighting. This structure gives it a different exposure from the price-weighted Nikkei 225. An index gain also does not establish that every member rose; constituent-level breadth data would be needed for that conclusion.
Remaining session
Readers should distinguish the fixed 09:00 opening from the unfinished Wednesday result. Tokyo still has its afternoon cash session before the 15:30 JST close. The next useful comparisons are the final level against 4,037.16 and whether the morning recovery survives that later session. All levels here are index points, not the purchase price of an individual share or investment fund.