Chip equipment takes the hit
Thursday’s session in Tokyo belonged to the sellers of semiconductor-capital-equipment stocks. The Nikkei 225 finished at 62,907.84, down 1,713.40 points (-2.65%), while the broader tape held up better: the TOPIX ETF proxy (1306) fell 1.17%. Beneath that, the damage was concentrated and severe: SCREEN (7735) dropped 8.83% on volume 1.3x its 20-day average, Tokyo Electron (8035) lost 6.99% to 9,450 on 1.4x volume, SoftBank Group (9984) fell 6.86% to 4,305, Lasertec (6920) shed 6.34%, and Advantest (6857) declined 6.01% to 32,370.
The catalyst came from the US supply chain. Lam Research reported record September-quarter revenue of $8.22 billion, up 22% from the June quarter, yet its shares fell sharply in extended trading after the company flagged a significant decline in China revenue for the December quarter — and that after-hours reaction, together with S&P 500 futures trading down 1.03% during Tokyo hours, set the defensive tone for anything tied to AI hardware. The Nikkei Volatility Index jumped 5.12 points to 35.97, its 94th percentile over the last 929 sessions — stressed territory.
Not everything fell. Sony (6758) rose 1.72% to 4,081, NEC (6701) gained 3.14% and Fujitsu (6702) 3.13% within our 95-name large-cap universe, while Toyota (7203) held up with a modest 0.32% dip. The yen firmed, with USD/JPY down 0.74% to 157.10 on safe-haven demand, an added headwind for exporters.
Sector rotation: energy over machinery
Measured by TOPIX-17 ETF proxies (Nomura NEXT FUNDS closes, which can deviate slightly from official sector indices), 7 of 17 sectors still managed to advance — this was a rotation as much as a rout.
| Sector (ETF proxy) | Day | vs TOPIX | 5-day |
|---|---|---|---|
| Energy Resources | +2.87% | +4.04pp | +3.8% |
| Transport & Logistics | +0.94% | +2.12pp | +2.3% |
| Pharmaceuticals | +0.75% | +1.93pp | +4.4% |
| Electric & Precision | -2.50% | -1.33pp | -1.2% |
| Machinery | -2.74% | -1.56pp | -2.5% |
| Steel & Nonferrous | -4.18% | -3.00pp | -5.7% |
Energy’s leadership fits the day’s narrative of rising crude prices, and INPEX (1605) gained 3.08%. Defensive bids showed up in pharma and in names like JR East (+2.52%) and Tokio Marine (+2.24%).
Rates and FX
JGB yields (MOF official, as of October 21) were little changed: the 10-year at 2.923% (-0.4bp), the 30-year at 3.980% (-1.2bp), the 2-year at 1.914%. With Governor Ueda’s recent remarks that inflation is near the 2% target, the market heads into the October BOJ meeting expecting a hold but keeping later-year hike risk priced. The firmer yen at 157.10 did its usual work on exporter sentiment, with Fast Retailing (9983) off 0.68% and MUFG (8306) down 1.69%.
Positioning: short selling at the top of its range
The TSE short-selling ratio — this site’s daily positioning signature — came in at 43.2% of total trading value (34.2% under the price rule plus 9.0% unrestricted) on turnover of JPY 7.90 trillion. That is the very top of the last eight sessions’ 32.9%–43.2% range, versus a 39.2% average: an unmistakably defensive tape, with a large share of flow initiated on the short side.
The borrow market is already expensive to be short in, however. JSF data for October 21 (the previous session; today’s figures publish later) show 447 of 1,034 loanable issues charging gyaku-hibu premiums — an extra daily cost short sellers are paying, and a broad squeeze-cost signal. The same JSF data show fresh stock-lending (shares borrowed for shorting) building into the weakness: Sony’s lending balance rose 39,200 shares, Tokyo Electron’s 5,400, Advantest’s 5,900. On the leveraged-long side, margin-loan balances were being trimmed — MUFG down 456,000 shares, SoftBank Group down 160,200 — modest long deleveraging rather than capitulation, against aggregate loans for margin buying of JPY 0.58 trillion versus JPY 0.19 trillion of stock lending.
Among JPX large short-position disclosures published Thursday (regulatory position filings reported with a lag — positioning context, not today’s flow and not the cause of today’s move): 929 reports across 633 issues, with aggregate disclosed shorts of 15.5% in TOWA (6315) and 15.3% in KLab (3656). The most notable change was a 10.43pp reduction in disclosed shorts on the Nikkei 225 Leveraged ETF (1570) — a meaningful unwind of index-level short positioning at some point before today’s session.
Weekly Flows
MOF weekly cross-border securities flows for the week of October 11–17 (designated major reporters; weekly figures, not today’s flows) showed foreign investors net sellers of JPY 0.07 trillion of Japanese equities, while Japanese residents net bought JPY 0.13 trillion of foreign equities. Both are small in absolute terms; the direction — mild foreign selling heading into this week’s volatility — matters more than the amounts.
What to watch
- US chip-equipment follow-through: with S&P 500 futures down 1.03% during Tokyo hours after Lam Research’s after-hours drop, tonight’s US session will decide whether Tokyo’s semi names get relief or a second leg.
- The BOJ’s October meeting: a hold is widely expected, but with Ueda flagging inflation near 2% and USD/JPY at 157.10, any hawkish shading would compound the yen headwind for exporters.
- Positioning extremes: whether the 43.2% short-sell ratio and the 94th-percentile Nikkei VI (35.97) recede — with 43% of loanable issues already charging gyaku-hibu premiums, crowded shorts face real carrying costs if the tape stabilizes.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.