Afternoon Recovery Into a Policy Week
Tokyo delivered a quietly constructive session on Wednesday. The Nikkei 225 dipped into negative territory early — the S&P 500 had closed down 0.45% at 7,585.73 the night before — then found its footing after lunch and finished at 63,923.00, up 0.69% and near the day’s highs. TOPIX, tracked via the 1306 ETF, added 0.62% to 423.90 and held positive ground throughout. Overnight sentiment helped at the margin: S&P 500 futures were up 1.05% at 7,669 by the Tokyo close.
The yen stayed soft, with USD/JPY quoted around 155.0 on Wednesday, up roughly 0.4% on the day, even as markets widely anticipate a 25bp Bank of Japan hike to 1.25% at the meeting ending Friday. Governor Ueda and colleagues have signaled a willingness to move nimbly against upside price risks, and the JGB market is already trading that way: MOF closes from Tuesday show the 10-year at 3.028% (+4.0bp on the day), the 20-year at 3.865% (+5.7bp) and the 30-year at 4.106% (+6.6bp) — a steady bear-steepening into the decision.
Sectors and Single Names
Twelve of the seventeen TOPIX-17 sectors advanced, judging by the Nomura ETF proxies (which can deviate slightly from official indices). The leadership was unambiguous:
| Sector (ETF proxy) | Day | vs TOPIX |
|---|---|---|
| Energy Resources | +2.82% | +2.20pp |
| Raw Materials & Chemicals | +2.51% | +1.89pp |
| Steel & Nonferrous | +1.54% | +0.93pp |
| Pharmaceuticals | -0.73% | -1.35pp |
| Banks | -0.60% | -1.22pp |
Within our fixed 95-name large-cap universe, ENEOS led at +4.99% on 1.3x average volume, with INPEX up 3.15% — the oil complex clearly responding to firm crude. Chip-equipment names did the other half of the lifting: SCREEN +4.37%, Tokyo Electron +2.05% to 51,690, Advantest +1.79%. Panasonic (+4.19%) and Murata (+3.16%) rounded out the gainers. On the losing side, Nitori fell 3.08%, Rakuten 2.58%, and domestic consumer names Oriental Land and Aeon each shed 1.67%. Among the megacaps, SoftBank Group dropped 1.53% to 6,183, while Toyota (-0.17%), Sony (-0.16%) and MUFG (-0.35%) drifted — bank softness is worth noting two days before a likely hike. The Nikkei Volatility Index eased 2.24 points to 28.44, still the 76th percentile of the past 907 sessions: calmer, but not calm.
Positioning: Shorts Steady, With Pockets of Squeeze Cost
Short selling accounted for 41.5% of Wednesday’s JPY 7.40 trillion in TSE trading value (33.8% price-rule restricted plus 7.7% unrestricted). That is an elevated, defensive reading in absolute terms, but it sits in the middle third of the past eight sessions’ 38.1%–44.9% range and almost exactly on the 41.7% average — hedging pressure is persistent, not escalating, into the BOJ.
Tuesday’s JSF standardized-margin data (the latest published) showed leveraged long demand at JPY 0.66 trillion against JPY 0.18 trillion of stock lending on the short side. The notable single-name move was SoftBank Group: shares borrowed for shorting jumped by 152,900 to 177,200 while margin-buying balances fell by 170,000 — fresh short-side interest that predates, and rhymes with, Wednesday’s 1.53% decline. Advantest and MUFG both saw meaningful additions to margin-buying balances (+79,900 and +91,800 shares respectively), pointing to leveraged longs leaning into chips and banks. Squeeze costs remain broad: 374 of 848 loanable issues carried gyaku-hibu premium charges — the extra daily fee short sellers pay when borrow is tight — including a WTI crude ETF, consistent with the pressure in the energy trade. JSF also has 329 issues under new-application suspension and 147 on caution alert, with two oil-linked funds newly flagged this week.
Separately, Wednesday’s batch of large disclosed short positions — regulatory filings reported with a lag, describing positioning rather than today’s flow — ran to 961 reports across 644 issues. ReYuu Japan (13.4% of shares outstanding across three positions) and a Nissay TOPIX ETF (12.6%) top the list, with SHIFT (10.4% across five positions), W-SCOPE (9.9%) and TOWA (9.1%) among the largest single-stock positions. The largest reductions versus prior filings were in Sanrio (-2.61pp), Renascience (-1.98pp) and, interestingly, a Nikkei 2x bull ETF (-1.47pp) — some index-level short exposure being trimmed.
Weekly Flows
The latest JPX investor-type data covers the week of August 31–September 4 and is not today’s flow. Foreign investors were net sellers of JPY 0.17 trillion on TSE Prime, and individuals net sold JPY 0.05 trillion. MOF’s cross-border securities data for roughly the same week — a different reporting basis, where direction matters more than the amount — showed foreigners as net buyers of JPY 0.69 trillion of Japanese equities, so the two gauges disagree on sign and the foreign-flow picture is best called mixed rather than clearly negative. Retail leverage keeps building: Tokyo+Nagoya margin buying stood at JPY 6.65 trillion as of September 11 (+0.17T on the week) against just JPY 0.80 trillion of margin selling.
What to Watch
- BOJ decision, September 17–18. A 25bp hike to 1.25% is the consensus; the reaction in a bear-steepening JGB curve and in the bank stocks that lagged today will tell you how much was priced.
- The energy complex. Sector leadership, ENEOS/INPEX volume, and fresh JSF restrictions on oil-linked ETFs all point the same direction — watch whether crude-driven momentum survives the policy decision.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.