The US session that set this off was the worst for the Dow on a post-midterm day since 1896. The Dow fell about 3.4%, the S&P 500 about 4.3% and the Nasdaq Composite about 5.5%, closing in correction territory, per Yahoo Finance's session log. The Nasdaq 100 dropped 6% and lost a record $2.3 trillion in value while the Philadelphia semiconductor index fell 12.3%.

The mechanism is specific and political. Democrats took both chambers on Tuesday; senior figures in the party immediately called for a national moratorium on data-centre construction. Every listed company whose earnings depend on that buildout continuing at current pace was repriced within 48 hours, and Tokyo's chip complex sits directly downstream of it.

Equity long-short funds focused on technology fell more than 4% on the day, leaving returns for the year roughly flat against a peak gain of 24% in June, Reuters reported. Global fundamental long-short managers were down 1.3% on average and multi-strategy managers 1.4%. Goldman Sachs data show managers sold roughly $20 billion of technology stocks over two weeks and erased, in five sessions, their entire net accumulation of AI stocks since the start of 2025.

The institutional consequences are already visible. Walleye Capital, a $17 billion multi-strategy firm, lost 5.9% in October — its worst month since March 2020 — and told investors it would trim its internal equity long-short business and cut a substantial part of its equity investment team. "Following our worst month since March 2020, in an already challenging 2026, we have taken a hard look at every aspect of our firm," the letter said. When crowded positions are being reduced because risk limits demand it rather than because views have changed, the selling does not stop at a valuation.

American retail investors sold a net $257 million of individual stocks on Thursday, the fifth-largest single day of net selling since March 2020, according to Vanda Research data reported by Yahoo Finance. "This is what we would call a total capitulation by retail investors," Vanda global macro strategist Viraj Patel said.

The break in behaviour is the signal. This cohort has bought essentially every drawdown of the past five years, and Vanda found "no signs of buying the dip" in single stocks — though leveraged ETFs including the triple-long Nasdaq and semiconductor products still saw inflows. A dip-buying base that stops buying removes a reliable bid from precisely the names Tokyo's equipment makers trade in sympathy with.

The KOSPI fell 8.55% at the open to 4,923.47, triggering a 20-minute market-wide halt — the tenth circuit breaker of the year — and taking the index below 5,000 for the first time in nine months. Samsung Electronics fell 10% and SK Hynix 11.7%.

The policy response came within hours. Finance Minister Lee Hyoung-il chaired an emergency market meeting with the Financial Services Commission, the Financial Supervisory Service and the Bank of Korea, and authorities suspended the mandatory 140% collateral maintenance ratio on brokers' margin lending for three months to head off forced liquidations, saying more measures would follow if volatility worsened. Seoul's memory duopoly is the customer base for Japan's chip-equipment and materials exporters, so a Korean margin spiral is a Japanese earnings problem with a short lag.

The Taiex fell 3,737.67 points in early trading to an intraday low of 37,837.05 — 8.99% down and the largest intraday point decline in the market's history. TSMC, more than 40% of the index by value, opened limit-down at NT$2,020, a fall of NT$220 that is its largest absolute intraday drop on record and cut NT$5.7 trillion from its market capitalisation. MediaTek, Delta Electronics, ASE Technology, Nanya Technology and Yageo also hit limit-down; Foxconn fell more than 9%.

The close was materially better than the open: the index finished down 1,873.08 points, or 4.51%, roughly half the intraday damage. That partial recovery is the only constructive data point in the region's day, and analysts quoted in the same report warned that margin-call selling pressure still lies ahead.

The October employment report is due Friday in the US, and it lands on a tape that has just repriced the AI trade on political grounds rather than economic ones. The labour market going in looks firm: weekly initial jobless claims fell 6,000 to 189,000, matching a 57-year low set in July and beating expectations of 196,000, while economists expect job growth to pick up with wage gains moderating.

The asymmetry is unpleasant. A strong print argues against the Federal Reserve easing into an equity shock; a weak one validates the growth fear the bond market spent Friday pricing. Tokyo will not see the reaction until Monday, which means Japan carries a full weekend of unhedged exposure to whichever reading New York decides to take.

Four countries have been exempted from Iran's effective closure of the Strait of Hormuz, Iranian lawmaker Amir Hayat Moqaddam said: India, China, Qatar and Iraq. "Ships from these countries pass freely, and the Americans do not intercept them either," he said, in reporting on how the exemptions work. China and India pay transit fees; Qatar is mediating; Iraq has been exempt since April. Roughly 10.23 million barrels a day moved through the strait in October, 42% of it to China and 13% to India.

That is a selective, revenue-generating chokepoint rather than a closed one, and Japan is not among the beneficiaries. Brent ground higher on the renewed Iran risk, with Rapidan Energy's Bob McNally putting the probability of military fighting resuming at 80% and both benchmarks capable of clearing $100. Against that, fresh signs of a supply glut are appearing as high prices curb demand. Higher crude is a straight drag on Japan's import bill and its trade balance at a moment when the equity market has already removed one source of support.

Bitcoin was at $75,569.57, down 0.68% — a small move on a day equity indices fell by multiples of that. Investing.com framed the slip to the $75,000 area as a function of growing US regulatory uncertainty rather than the equity rout. Elsewhere in digital assets the picture was uglier: XRP fell 10%.

The President, for his part, assigned blame. "The Stock Market crashed today because the Dumocrats had a big Tuesday," Donald Trump wrote on Truth Social, in one of several posts attributing the selloff to the midterm result. Whatever one makes of the causation, the market's own explanation — that a Democratic Congress constrains the AI buildout — is not far from his.

The thing that broke the AI trade this week is not a demand signal, it is a legislative one. Senior Democrats called for a national data-centre moratorium within a day of winning both chambers. At state level, Texas's governor-elect Hinojosa said the state would pass laws to shield citizens from data centres — notable because Texas has been the most permissive large jurisdiction for this construction in the US.

Operators are already adjusting the pitch. Equinix pointed to smaller facilities as US scrutiny of construction grows, with Asia a relatively larger part of the plan, and OpenAI said it would step back from non-disclosure agreements on data-centre projects and give local communities more say. For Japan's equipment and materials suppliers, the question is not whether AI capital spending continues but whether its timing slips a few quarters to the right — which, for companies that book revenue on tool shipments, is the only question that matters.

Advanced packaging capital spending is forecast to reach about $28 billion in 2026, the year advanced packaging revenue is expected to overtake traditional packaging for the first time, according to an industry survey naming Applied Materials and Tokyo Electron among the equipment players. Modern processors now integrate ten or more chips, sometimes as many as twenty, and former Intel chief executive Pat Gelsinger estimates packaging could eventually account for as much as half the value of a chip product. "Packaging was always that thing that you just didn't worry about," he said.

The capacity scramble is explicit. Nvidia is providing billions in financing to expand CoWoS capacity at Siliconware Precision, AMD has announced more than $10 billion of investment across Taiwan's semiconductor industry, and Powertech is putting $400 million into an advanced packaging joint venture with Broadcom in Singapore that could start production by 2028. "Everyone is looking for a solution outside TSMC," Powertech chairman D K Tsai said. That diversification is a direct order flow opportunity for Japanese tool and materials suppliers, and it is being decided now, while their share prices say the cycle is over.

YMTC plans to source up to 70% of the equipment for its fourth factory from domestic suppliers, up from just over 50% at its third, Reuters reported. The company is China's largest flash memory maker, and the shift is a deliberate response to export controls rather than a cost exercise.

This is the structural risk sitting underneath Japan's equipment complex that nobody repriced this week because it moves too slowly to make a headline. Every percentage point of localisation at a Chinese fab is permanent lost addressable market for the Japanese and American tool makers that built it, and it does not come back when the cycle turns. Friday's selling was about an American legislature. This is the slower problem.

Republican leaders of three House committees have asked chief executive Jensen Huang for a closed-door briefing over his contacts with a Megaspeed executive whom reporting has characterised as a Chinese asset, according to CNBC's account of the request. That is an allegation rather than an established fact, and it arrives in the same week the company's shares fell 9.5% in a single US session.

For Tokyo the date to hold is 17 November, when Nvidia reports. Japan's equipment names have spent this week being marked down on a political thesis about American construction permits, not on any deterioration in orders. Numbers from the company at the centre of that construction are the first hard evidence the thesis will have to survive. In the meantime the sell-side is split on how far this runs: Jim Cramer's read is that the AI sell-off is not over but is not another dot-com collapse either.

Micron has lost more than 40% from its June record, a decline a Motley Fool analysis argues is disconnected from the demand picture, after falling 17.1% in Thursday's US session. Sandisk fell alongside it and the memory trade broke as a group, with the Philadelphia semiconductor index posting its worst day since March 2020.

The Tokyo read-across is immediate and double-edged. Kioxia fell 36.8% across the week as the market treated it as a pure proxy for the same trade. But memory pricing is also the cost line that just cut Nintendo's margins, and the two facts cannot both be resolved by a single view on whether AI capital spending slows. Someone in Japan's supply chain is wrong about the price of DRAM next year.

Thinking Machines Lab is raising about $5 billion led by Accel at a $40 billion pre-money valuation, more than tripling its last public mark, sources told Business Insider. The company also released Inkling 2 Small, a mixture-of-experts model with 594 billion total and 17 billion active parameters, with weights due next week after safety testing.

Hold that against a week in which listed AI infrastructure lost trillions in market value. Private capital is still underwriting model development at rising prices while public markets mark down the people who build the physical capacity those models need. One of those two groups is mispricing the same future, and Japan's equipment makers are levered to the public market's answer while their actual order books depend on the private one.

The Binance attackers moved roughly $2.5 billion — about 40% of the $6.3 billion total — in a single Ethereum transaction, using wallet permissions that cost just $15 to set up, security firm Blockaid told Bloomberg. Japan Today reports the operation is attributed to North Korea's state hacking apparatus.

The detail that matters for every Japanese financial institution reading this is the $15. The breach was not a cryptographic failure; it was an approval mechanism working exactly as designed on behalf of the wrong party. Japan has spent this week dealing with its own run of data-handling failures at insurers, telecoms and banks, and the common thread is identical — the controls held and the permissions did not.

Births in Tokyo rose 4.7% in the first half of 2026 to 41,745, an increase of 1,864 on the same period last year and the largest rise of any prefecture. Nationally, births reached 320,458, up 1,379 or 0.4% — the first year-on-year increase for a January-June period in 11 years, according to figures released by the Tokyo Metropolitan Government.

The national number is carried almost entirely by the capital. Tokyo accounted for roughly an eighth of first-half births, and excluding it the other 46 prefectures recorded a cumulative 0.2% decline. It is the third consecutive six-month period of increase in Tokyo, and the rate of increase has climbed from 0.3% to 4.7% across those periods.

Pan Pacific International Holdings, the discount empire behind Don Quijote, is reshaping the Toys R Us business it acquired in Japan by tripling the number of products on the shelves and adding in-store play and experience zones, Nikkei Asia reports. The Aqua City Odaiba store in Tokyo is among the locations being rebuilt around the new format.

The strategy borrows directly from the Don Quijote playbook, which has always treated density of stock as entertainment in itself. It also reads the market correctly: Japan's toy business has been carried as much by adult collectors as by children for several years now, and a shop you browse rather than shop in is better suited to both.

The Switch 2 has sold 26.35 million units as of 30 September, including 6.49 million in the current fiscal year, Nintendo's latest figures show. Software has reached 73.21 million units, led by Mario Kart World at 16.48 million copies, and digital sales now make up 60.7% of all software sold across both Switch generations this year, up 6.2 points year on year.

For scale, the original Switch sits at 157.20 million lifetime units and is still selling. The Switch 2 passed the Wii U's entire lifetime total last December, which is the kind of comparison Nintendo presumably enjoys making and the company's shareholders currently do not.

Kozo Tashima, 68, is standing for the FIFA presidency — the first Japanese candidate ever to do so — against the incumbent Gianni Infantino, in a campaign built explicitly around governance. "In this age of business and money, sport must firmly uphold its integrity," he says. He played for Japan's national team, studied coaching at the German Sport University Cologne, and led the Japan Football Association from 2016 to 2024.

He is not a soft-focus candidate. As JFA president he dismissed national coach Vahid Halilhodzic two months before the 2018 World Cup and accepted full responsibility for it. He has since criticised FIFA over a reinstatement of an American player following presidential intervention and over travel restrictions imposed on Iran's World Cup squad.

A survey has found that only 6.7% of Japanese people report having stopped reading manga, according to figures circulated this week. Given how durable the "young people don't read any more" narrative has been in Japanese publishing commentary, the finding is less a surprise than a correction.

What it suggests is that the format changed rather than the readership. Digital and app-based serialisation absorbed a generation that the print circulation figures recorded as having disappeared, which is why the publishers' revenue held up considerably better than their magazine numbers.

A Kyoto city advisory council has approved easing the height limit on the south side of Kyoto Station to 45 metres, Asahi reports. In almost any other city this would be an unremarkable zoning item. In Kyoto, where height restrictions are a defining element of civic identity and the subject of decades of argument, a 45-metre line drawn on one specific side of one specific station is a considered political act.

The south side is also the right place to test it. It has long been the station's less-loved flank, and the practical question the city is answering is whether a hotel and office district can be built there without anyone standing in Higashiyama noticing.

The Switch 2 remake of The Legend of Zelda: Ocarina of Time accepts audio through the console's built-in microphone, so Link's songs can be performed by humming, singing, shouting or playing an actual instrument into it — and the recognition turns out to be gloriously forgiving. Players have discovered it makes educated guesses at approximate melodies, which has set off exactly the experimentation you would expect.

People are transposing anime themes and other games' soundtracks onto the five-note system to see what the game thinks they meant. One player got hold of a real ocarina, played it at the screen, watched Link play along, and called it an incredible timeline. Another, after a particularly unexpected result, declared he had always known the ocarina feature was a scam.