A Strong Close to the Fiscal Half
Tokyo went into the September 30 fiscal half-year-end with conviction. The Nikkei 225 closed Wednesday at 66,753.72, up 1.94%, snapping a two-session decline, while our TOPIX proxy (the 1306 ETF) gained 1.43% to 431.50. The defining story was concentration at the top: SoftBank Group (9984) surged 6.55%, the top gainer in our tracked 95-name large-cap universe. Banks ran hard behind it — MUFG added 3.01% and Mizuho 4.52% — as the market continues to digest the Bank of Japan’s September 18 hike to 1.25%, its highest short-term rate since 1995, and Governor Ueda’s data-dependent tightening bias.
Two caveats before extrapolating. First, this was an ex-dividend cluster week, so index arithmetic is mechanically distorted by dividend drop-offs and half-year-end rebalancing flows. Second, breadth on the Prime market was reportedly narrow despite the headline gain, with more than half of constituents closing lower. A 1.9% index day built on SoftBank, banks and a handful of chip names is not the same as a 1.9% market day.
| Instrument | Close (Sep 30) | Change |
|---|---|---|
| Nikkei 225 | 66,753.72 | +1.94% |
| TOPIX (1306 ETF proxy) | 431.50 | +1.43% |
| SoftBank Group (9984) | 6,430 | +6.55% |
| Fast Retailing (9983) | 70,860 | +3.13% |
| MUFG (8306) | 3,700 | +3.01% |
| Tokyo Electron (8035) | 11,815 | +2.69% |
| Toyota (7203) | 2,920 | +1.34% |
| USD/JPY (indicative quote — FX trades continuously, no official close) | ≈156.95 | -0.26% |
Sectors: Steel and Banks Lead, Energy Lags
Using TOPIX-17 ETF proxies (Nomura NEXT FUNDS closes, which can deviate slightly from official sector indices), 15 of 17 sectors advanced. Steel & Nonferrous led at +3.64%, Banks followed at +3.28% (now +4.4% over five days — the clearest post-BOJ trade on the board), and Construction & Materials added 2.41%. Energy Resources was the notable laggard at -0.39%, extending its five-day slide to -4.2% as crude prices retreated on restored Saudi pipeline capacity and US strategic reserve releases — a tailwind for Japan’s import bill even as it weighs on the sector itself. Machinery also slipped 0.38%.
Among our fixed 95-name large-cap universe (not a full-market scan), Nidec stood out with a +4.67% move on 2.1x average volume — the only top gainer with a genuine volume signature. Murata (-2.94%) led decliners in an otherwise quiet losers’ column.
Positioning: The Short-Selling Ratio Eases
Our daily signature stat: short sales were 40.4% of total TSE trading value Wednesday (34.7% price-rule restricted plus 5.7% unrestricted) on turnover of JPY 10.04 trillion. That sits in the lower third of the last eight sessions’ 39.4%–44.3% range, below the 41.4% average — in plain terms, sellers were slightly less defensive into the rally than they have been recently. The Nikkei Volatility Index reinforced the calm, dropping 5.91 points to 21.83, the 45th percentile of the past 914 sessions.
Under the hood, Tuesday’s JSF standardized margin data (September 29, the latest available) showed leveraged longs positioning into the bank trade: MUFG’s margin-loan balance — leveraged buying demand — rose 625,400 shares while its stock-lending balance, shares borrowed for shorting, collapsed by 3.1 million to just 900 shares. Toyota’s stock-lending balance went to zero outright. Squeeze costs remain broad: 385 of 866 loanable issues carried gyaku-hibu premium charges, the extra daily fee short sellers pay when borrow is scarce — 44% breadth is meaningful pressure on the short side of the tape.
Separately, JPX published 707 large disclosed short-position reports across 520 issues. These are lagged regulatory position filings, not today’s selling: TOWA (13.5% of shares outstanding disclosed short), KLab (11.9%) and Unitika (8.4%) top the list, with Datasection showing the largest build (+1.67pp versus prior reports). JSF restriction measures also keep tightening at the small-cap fringe, with 357 issues under new-application suspensions.
Weekly Flows
For the week of September 7–11 (published with a lag — these are not today’s flows), JPX Prime investor-type data showed foreign investors net buyers of JPY 0.73 trillion, with individuals modest net sellers at JPY 0.05 trillion. Worth flagging: MOF’s cross-border securities data for the same week, compiled on a different reporting basis, showed foreigners as net sellers of JPY 1.52 trillion of Japanese equities. The two series disagree on direction this week, so we would treat the foreign-flow picture as unresolved rather than cleanly bullish.
Rates and the Yen
JGBs were quiet into the data: the 10-year sat at 3.082% (unchanged on the day, per MOF’s September 29 marks), with the 30-year at 4.126%. The yen firmed slightly, with USD/JPY quoted around 156.95 as of the September 30 Tokyo close (down about 0.3% on the day), trading a 156.4–157.3 band amid half-year-end currency flows and lingering wariness about intervention. Tokyo also decoupled from a soft Wall Street lead — the S&P 500 slipped 0.17% Tuesday — though overnight futures at 7,749.50 (+0.23%) suggested the drag was fading by Tokyo’s close.
What to Watch
- Post-ex-dividend follow-through: with half-year-end distortions out of the way from October 1, whether banks (+4.4% on the week) and the SoftBank-led leadership hold without rebalancing flows.
- The flow discrepancy: next week’s JPX and MOF releases, to see whether foreign investors were genuinely buying or selling in mid-September.
- Short-side stress: whether gyaku-hibu breadth (385 of 866 issues) and the 40%-area short-sell ratio compress further if the rally extends — that combination is where squeezes get expensive.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.