A Tech-Led Drop, Then an Afternoon Rescue
Tokyo opened the week on the back foot. The Nikkei 225 closed Monday at 64,916.70, down 0.62%, but the headline number understates the drama: the index briefly plunged more than 1,400 points intraday, dipping below the 64,000 line for the first time in roughly a month, before afternoon dip-buying and value hunting pared the losses. The broader TOPIX, measured by the 1306 ETF proxy, fared better, slipping just 0.30% to 427.10 — a gap that tells you this was a narrow, tech-heavy sell-off rather than a broad liquidation.
The trigger was imported. The S&P 500 fell 1.09% to 7,659.44 at Friday’s US close, with the pressure concentrated in technology as investors questioned the capital intensity of AI data-center spending. Tokyo’s chip complex followed: Tokyo Electron fell 2.63% to 10,350, Lasertec dropped 3.91% and SCREEN lost 3.44% among our fixed universe of 95 tracked large caps. SoftBank Group, the index’s AI proxy, lost 2.00% to 4,845, and Fast Retailing shed 2.29%. Advantest was comparatively resilient at -0.23%.
Outside tech, the tone was calm. Toyota added 0.26%, Sony was flat at +0.03%, and MUFG edged up 0.09%. The yen offered little new input: USD/JPY closed Friday at 158.14 and was little changed on Monday, with the late-October BOJ policy meeting the next scheduled catalyst on the currency front. One constructive overnight cue: S&P 500 futures were up 0.55% at 7,747 during Tokyo hours.
Sectors: Energy and Real Estate Carry a Quietly Positive Tape
Using TOPIX-17 ETF proxies (Nomura NEXT FUNDS closes, which can deviate slightly from official sector indices), 14 of 17 sectors actually advanced on a day the headline index fell — a useful reminder of how concentrated the damage was.
| Sector (ETF proxy) | Day | 5-day |
|---|---|---|
| Energy Resources | +2.05% | +3.8% |
| Real Estate | +1.17% | +5.6% |
| Power & Gas | +0.97% | +0.8% |
| Electric & Precision | -1.15% | -7.2% |
| Steel & Nonferrous | -0.42% | -9.6% |
Rising crude futures on Middle East supply concerns put energy at the top: INPEX gained 3.71% and ENEOS 2.24% among tracked large caps, with shipper MOL up 2.39% and Aeon adding 3.31%. The five-day columns show the rotation clearly — real estate up 5.6% and energy up 3.8% over the week, against a 7.2% slide in electric & precision and a 9.6% drop in steel & nonferrous.
Positioning: Short-Selling Ratio Stays Elevated at 39.3%
Our daily signature stat: short sales were 39.3% of total TSE trading value on Monday (31.0% under the price rule plus 8.3% unrestricted), on turnover of JPY 7.55 trillion. That sits in the upper third of the last eight sessions’ 32.9%–41.6% range, slightly above the 38.9% average — in plain terms, trading desks remain defensively positioned, leaning on shorts and hedges rather than chasing the tape.
The hedging bias shows up in the regulatory filings too. Monday’s large short-position disclosures — lagged position filings, not today’s selling — ran to 1,113 reports across 731 issues. Notably, the biggest increases versus prior reports were in leveraged index vehicles: disclosed shorts in the Nikkei 225 Bull 2x ETF (1579) rose 7.95 percentage points, and the NEXT FUNDS Nikkei Leveraged ETF (1570) rose 7.32 points to an aggregate 11.4%. That is index-level downside positioning, not single-stock conviction.
Japan Securities Finance data for Friday (Monday’s figures are not yet published) adds texture: loans for margin buying — leveraged long demand — stood at JPY 0.59 trillion against JPY 0.18 trillion of stock lending on the short side. Within large caps, Toyota saw stock-lending balances jump 37,200 shares while margin-loan balances fell 73,100, and Advantest’s margin-loan balance dropped a hefty 156,000 shares — leveraged longs trimming chip exposure into the weekend. Meanwhile, 434 of 1,012 loanable issues (43%) incurred gyaku-hibu premium charges, the extra daily cost short sellers pay when borrow is tight — broad squeeze pressure that cuts against the bearish positioning elsewhere.
The Nikkei Volatility Index eased 0.94 points but, at 31.23, still sits at the 86th percentile of the last 926 sessions. Nerves have not left the building.
Weekly Flows
The latest JPX investor-type data (TSE Prime, value basis, week of September 7–11 — published with a lag, not today’s flows) showed foreign investors net buyers of JPY 0.73 trillion, against modest net selling of JPY 0.05 trillion by individuals. The more recent MOF cross-border series (week of October 4–10, designated major reporters, a different reporting basis where direction matters more than the level) points the same way: foreigners net bought JPY 3.52 trillion of Japanese equities, while Japanese residents net sold JPY 0.76 trillion of foreign equities. Whatever Monday’s tape felt like, the structural foreign bid has remained intact through early October.
Rates Corner
MOF data through Friday had the JGB curve grinding higher: the 10-year at 2.958% (+1.0bp), the 20-year at 3.803% (+1.7bp) and the 30-year at 4.040% (+1.6bp). Monday’s official yield figures were not yet published at the time of writing — the rates backdrop remains one to watch alongside the real estate bid noted above.
What to Watch
- Japan CPI and the late-October BOJ meeting — the inflation print is the next major input ahead of the policy decision.
- US tech follow-through — S&P futures up 0.55% during Tokyo hours hint at stabilization; whether the AI-capex scare has run its course will set the tone for Tokyo Electron, Advantest and SoftBank.
- The energy/real estate rotation vs. chip weakness — five-day spreads (real estate +5.6% vs. electric & precision -7.2%) are wide; watch whether elevated short positioning and 43% gyaku-hibu breadth fuel a squeeze if the tape steadies.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.