The Nikkei 225 closed Monday at 66,970.22, up 2.08%, in a session that belonged almost entirely to the semiconductor complex. Advantest jumped 6.43% to 34,260 and Tokyo Electron added 4.13% to 56,750, extending a run built on AI-infrastructure demand and a friendly Wall Street handoff — the S&P 500 rose 0.62% on Friday after a cooler U.S. labor-market report eased rate-hike worries. The breadth of the move was far narrower than the headline suggests: the TOPIX proxy gained just 0.59%, and only 9 of 17 sectors advanced. The yen was little changed around 158.5 to the dollar, and traders squared positions ahead of Tuesday’s Mountain Day holiday.
| Index / Stock | Close (Aug 10) | Change |
|---|---|---|
| Nikkei 225 | 66,970.22 | +2.08% |
| TOPIX (1306 ETF proxy) | 427.60 | +0.59% |
| Advantest (6857) | 34,260 | +6.43% |
| Tokyo Electron (8035) | 56,750 | +4.13% |
| Sony (6758) | 3,764 | +1.16% |
| MUFG (8306) | 3,510 | -1.52% |
| SoftBank Group (9984) | 5,484 | -1.22% |
| USD/JPY | around 158.5 | little changed |
The Tape: A Two-Speed Market
The gap between the Nikkei’s +2.08% and TOPIX’s +0.59% tells Monday’s story. Chip testing and tooling names did the heavy lifting; the value side of the market either sat out or sold off. Toyota was essentially flat at 2,981 (+0.03%), Fast Retailing slipped 0.74%, and SoftBank Group — often a fellow traveler in tech rallies — fell 1.22%. MUFG dropped 1.52%, notable on a day when the rate backdrop should in principle have flattered banks. Total TSE turnover was a healthy JPY 9.85 trillion.
Sectors and Movers
By TOPIX-17 ETF proxies (Nomura NEXT FUNDS closes, which can deviate slightly from official sector indices), IT & Services led at +3.58%, followed by Steel & Nonferrous at +3.44% — the latter now up 13.6% over five sessions — and Electric & Precision at +2.04%. The laggards were rate- and defensively-flavored: Real Estate -2.46%, Power & Gas -2.21%, and Banks -1.88%.
Within our fixed 95-name large-cap universe (not a full-market scan), the single-stock action was violent. Recruit soared 22.79% on 1.5x average volume and Sysmex gained 19.89% on 4.7x volume, with Olympus (+10.10%), Nitori (+9.73%) and Terumo (+8.53%) rounding out the leaders — a striking cluster of medical-device strength. On the downside, ENEOS lost 6.08% and KDDI 5.07%.
Rates and the Yen: The Curve Keeps Drifting Higher
The JGB curve has been drifting higher: as of Friday’s MOF close, the 2-year sat at 1.611% (+4.6bp on the day), the 10-year at 2.804% (+3.1bp), and the 30-year at 3.925%. Despite the firmer rate backdrop, the yen barely moved, with USD/JPY little changed around 158.5 as rate differentials continue to dominate. The disconnect between rising JGB yields and falling bank shares is worth watching — Banks lost 1.88% on the day even as the curve backs up.
Positioning: Short Ratio Mid-Range, Squeeze Costs Broad
The TSE short-selling ratio — our daily positioning signature — came in at 41.1% of trading value (33.6% price-rule restricted plus 7.5% unrestricted). That sits in the middle third of the last six sessions’ 37.1%–45.4% range, against an average of 41.8%: neither the defensive posture an elevated reading would imply, nor a chase. The Nikkei Volatility Index fell sharply, down 4.89 points to 24.99, its 64th percentile over the last 881 sessions — normal territory.
Under the surface, short sellers are paying up. Per Friday’s JSF data (Monday’s figures are not yet published), 514 of 1,132 loanable issues — roughly 45% — incurred gyaku-hibu premium charges, the extra daily cost borne by shorts and a broad squeeze-pressure signal. In the same Friday data, the standout was MUFG, where margin-loan balances (leveraged long demand) collapsed by 3,052,000 shares — a large unwind of levered longs in the megabank ahead of Monday’s decline. Advantest saw the opposite: margin buying up 28,700 shares with stock-lending (borrow for shorting) down 2,700, a levered-long tilt into the chip rally.
On the regulatory side, JPX published 970 large disclosed-short-position reports across 634 issues on Monday. These are lagged position filings, not today’s selling: the largest aggregates were Oncolys BioPharma at 14.8% of shares outstanding and Unitika at 13.9%, with Silicon Studio showing the biggest increase versus prior reports at +2.38pp.
Weekly Flows
For the week of July 27–31 (JPX data, published with a lag — these are not today’s flows), foreign investors were net buyers of TSE Prime equities to the tune of JPY 0.37 trillion, while individuals net sold JPY 0.49 trillion — the familiar pattern of retail selling into foreign-led strength. A caveat: MOF’s cross-border securities data for the overlapping July 26–August 1 week showed foreigners as net sellers of JPY 0.39 trillion of Japanese equities. The two series use different reporting bases, so the divergence itself is the signal — foreign demand may be less one-sided than the JPX print alone suggests. Broader margin balances (Tokyo+Nagoya, as of July 31) stood at JPY 6.20 trillion of margin buying, down 0.27 trillion on the week, against JPY 0.73 trillion of margin selling.
What to Watch
- Nikkei 225 options SQ on Friday, August 14 — settlement four days out, with the market reopening Wednesday after the Mountain Day holiday; expect positioning noise around a 2%-up tape.
- Bank shares versus the rate backdrop — if JGB yields keep drifting higher, Monday’s -1.88% sector move and the large MUFG margin-long unwind either reverse or start saying something about growth expectations.
- Chip-rally durability — Steel & Nonferrous up 13.6% and IT & Services up 7.0% over five sessions; watch whether Monday’s JSF data, once published, shows shorts leaning into the extension.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.