Two Markets in One Tape
Tuesday’s session in Tokyo was really two markets. The Nikkei 225 dropped 1,253.40 points, or 1.82%, to close at 67,777.52 — its fourth consecutive losing session — dragged down almost entirely by its heavyweight chip and AI-adjacent names. The broader TOPIX, by contrast, finished marginally higher, gaining 5.86 points (+0.14%) to settle at 4,110.67 (the 1306 ETF proxy closed unchanged at 432.50), as money rotated out of technology and into domestic, value-oriented sectors. Total TSE turnover was a heavy JPY 8.87 trillion.
The yen was little changed, with USD/JPY trading around 158.10, and the overnight US backdrop was soft rather than alarming: the S&P 500 slipped 0.06% to 7,807.24 on Monday amid profit-taking in AI leaders, and S&P futures held steady near 7,856 through Tokyo hours. The damage in Japan was concentrated, not systemic.
Semiconductors and SoftBank Take the Hit
SoftBank Group fell 8.50% to 5,310, the worst performer in our 94-name large-cap universe, caught in broad AI risk-off sentiment. Tokyo Electron lost 7.15% to 11,555, with Nidec (-6.62%), SCREEN (-6.32%), Renesas (-5.92%) and Advantest (-2.91%) filling out the losers’ list. Memory maker Kioxia plunged — reports put the decline between 9% and 13% — following news of next-generation architecture progress at Chinese rival CXMT, which set the tone for the entire chip complex.
Notably, neither SoftBank nor Tokyo Electron fell on heavy volume: both traded at roughly 0.8x their 20-day average, suggesting an absence of bids rather than panic liquidation.
The Other Side: Value, Domestics, Shippers
Eleven of 17 TOPIX-17 sectors advanced on the day (ETF-proxy data, which may deviate slightly from official sector indices):
| Sector (ETF proxy) | Day | 5-day |
|---|---|---|
| Power & Gas | +2.18% | +1.8% |
| Energy Resources | +2.17% | +1.2% |
| Trading & Wholesale | +2.01% | +0.3% |
| Electric & Precision | -2.17% | -3.5% |
| Steel & Nonferrous | -1.87% | -4.9% |
Among large caps, Toyota rose 2.53% to 2,984 on rotational bargain hunting, MUFG gained 2.57%, and Fast Retailing added 2.80% — a reminder that the Nikkei’s fall was narrower than the headline suggests. Shippers Kawasaki Kisen (+3.53%) and MOL (+3.51%) advanced on above-average volume, alongside Marubeni (+3.13%), Sompo (+3.00%) and Pan Pacific International (+4.01%), the day’s top gainer in our fixed large-cap universe.
Positioning: Shorts Near the Low End of Their Recent Range
The TSE short-selling ratio — our daily positioning signature — came in at 38.3% of total trading value (32.3% price-rule restricted plus 6.0% unrestricted). That is elevated in absolute terms, meaning the tape remains defensive, but it sits in the lower third of the past eight sessions’ 38.0%–41.6% range, below the 39.7% average. Shorts were running below their recent average even on a 1.8% Nikkei decline.
JSF margin data (Friday October 9 figures — today’s are not yet published) adds texture. Leveraged long demand actually built into the weakness: margin-loan balances rose 314,100 shares at SoftBank Group and 303,900 at MUFG. At Tokyo Electron, margin loans fell by 374,500 shares while stock-lending (shares borrowed for shorting) rose a modest 8,700. Meanwhile 402 of 942 loanable issues — about 43% — carried gyaku-hibu premium charges, the extra daily cost short sellers pay when borrow is tight, a broad squeeze-cost signal. The Nikkei Volatility Index ticked up 0.27 to 30.41, its 84th percentile over the past 922 sessions.
On the regulatory side, Tuesday’s JPX large short-position disclosures — lagged position filings, not today’s selling — showed 1,510 reports across 820 issues, with the heaviest aggregate disclosed shorts in ReYuu Japan (23.9%), KLab (22.1%) and SHIFT (15.7%). The largest single change versus prior reports was a 6.71-percentage-point reduction in disclosed shorts against the SMDAM Nikkei 225 ETF — consistent with index-level short covering.
Weekly Flows
These figures are weekly and lagged, not today’s flows. For the week of September 7–11, JPX investor-type data for TSE Prime showed foreign investors as net buyers of JPY 0.73 trillion, against JPY 0.05 trillion of net selling by individuals. MOF’s separate cross-border series for the week of September 27–October 3 — a different reporting basis, so direction matters more than the level — showed foreigners net buying JPY 2.19 trillion of Japanese equities, while Japanese residents bought JPY 1.32 trillion of foreign equities. Both series point the same way: foreign money was still flowing in ahead of this pullback.
Macro: Soft PPI Complicates the BOJ Question
September producer prices rose 6.8% year-over-year, decelerating well below the 7.6% consensus — a data point traders immediately mapped onto the Bank of Japan’s rate-normalization timeline. JGB yields had already softened into the print: at the October 9 MOF close, the 10-year stood at 3.027% (down 6.2bp on the day) and the 30-year at 4.085% (down 5.1bp). With USD/JPY parked near 158, cooling wholesale inflation gives the BOJ room but keeps the yen question open. Externally, elevated US 10-year Treasury yields in the 5.2%–5.3% area remain the backdrop pressuring long-duration tech.
What to Watch
- Semiconductor positioning follow-through: Tuesday’s JSF margin and gyaku-hibu data publish next session — watch whether Tokyo Electron’s borrow build extends or long dip-buying resumes after a 5-day sector slide of 3.5%.
- BOJ signaling after the PPI miss: with wholesale inflation decelerating and USD/JPY near 158, any shift in normalization rhetoric will move both banks (today’s winners) and the yen.
- Rotation durability: 11 of 17 sectors advanced despite a 1.8% Nikkei fall; whether Power & Gas, Energy and trading houses keep absorbing tech outflows will decide if TOPIX can keep decoupling from the chip-heavy Nikkei.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.