Japan's stock market had one of its more volatile stretches of the year across the back half of July 2026. The Nikkei 225 lost 6.4% for the trading week ended July 17, closing at 64,141.12 after a 4.03% single-session plunge that Friday pushed the index into correction territory. Then, almost as quickly as it fell, it rebounded: by July 21 the Nikkei had jumped over 2,000 yen in a single session, and gains continued into midweek as the same semiconductor stocks that had been sold off hardest led the recovery.
The short version: Nikkei 225 -6.4% for the week ended July 17 (correction territory), then +2,091.07 yen on July 21 to 66,232.19, +0.43% on July 22 to 66,514, with further gains July 23. Chip stocks drove both the fall and the rebound: Kioxia +17.2% and Advantest +7.7% on July 21 alone, with Advantest and Tokyo Electron extending gains on July 23 after Alphabet raised its 2026 AI capex forecast to as much as $205 billion.
How a 6.4% weekly loss became correction territory
The prior week's selloff wasn't broad-based so much as concentrated in exactly the stocks that had carried the Nikkei's 2026 gains: chip-equipment and chip-testing names like Tokyo Electron, Advantest, and Kioxia. As global tech valuations came under pressure and geopolitical tensions added to the caution, these AI-infrastructure suppliers fell especially hard, with a 4.03% single-day drop on Friday, July 17 alone pushing the full index down 6.4% for the week and into correction territory — conventionally defined as a 10%-plus drop from a recent peak, which several of the index's chip components individually exceeded.
The same stocks that fell hardest led the rebound
Tokyo stocks rebounded sharply on July 21 as investors judged the prior week's selloff overdone and bought back semiconductor and AI-related shares at lower prices: Kioxia Holdings jumped 17.2%, Advantest gained 7.7%, and Tokyo Electron added 2.3% in a single session. The rally extended into July 23, when Advantest and Tokyo Electron posted further gains after Alphabet raised its full-year 2026 capital expenditure forecast to as much as $205 billion — a number Japanese investors read as a direct demand signal for the chip-testing and chip-equipment supply chain that feeds US AI infrastructure buildout.
| Date | Nikkei 225 move | Driver |
|---|---|---|
| Week ended Jul 17 | -6.4% to 64,141.12 | Global tech selloff, chip stocks hit hardest |
| Jul 21 | +2,091.07 yen to 66,232.19 | Chip-stock bargain buying (Kioxia +17.2%, Advantest +7.7%) |
| Jul 22 | +0.43% to 66,514 | Continued tech recovery, stable US semis |
| Jul 23 | Further gains | Alphabet raises 2026 AI capex to $195-205B |
What this means if you're investing through it
- The Nikkei's concentration in AI-infrastructure suppliers cuts both ways — the same names that drove the record highs earlier in 2026 also drove this month's sharpest single-week loss and its fastest rebound.
- A "correction" in a concentrated index can be about a handful of stocks, not the broader Japanese economy — worth checking what's actually driving a headline index move before assuming it reflects something wider.
- US AI-spending headlines now move Japanese chip stocks almost immediately — Alphabet's capex raise showed up in Tokyo trading within a day, a sign of how tightly linked these supply chains have become.