TOKYO, November 4 — Asian stocks fell sharply on Wednesday, November 4, as early results from the US midterm elections showed Democrats ahead in races for both the House and the Senate, prompting investors to dump artificial-intelligence-related stocks, Dow Jones Newswires reported. Japan's Nikkei Stock Average slid 4.2 percent, hitting a five-month low and leading declines across Asia, while US equity futures sold off and the dollar weakened further as Democrats scored a string of victories.

Source: Dow Jones Newswires via Morningstar, November 4

The selling was concentrated in the AI supply chain. In early Tokyo trade the Nikkei was down 3.1 percent at around 61,130 by 0150 GMT and the broader Topix about 1.9 percent at around 3,860, Reuters reported, with chip-testing equipment maker Advantest down 6.4 percent, Tokyo Electron down 5 percent, technology investor SoftBank Group down about 7 percent and memory-chip maker Kioxia down 10 percent; fibre-optic cable makers Fujikura and Furukawa Electric fell 8.2 and 9 percent. By later snapshots the Nikkei's fall had deepened past 4 percent — ET Net put it down 4.2 percent at 60,455.95, with the Topix down 2.8 percent at 3,819.54 — and the worst-hit names, including Kioxia and Taiyo Yuden, were down more than 13 percent at their lows.

Source: Reuters via InvestingLive, November 4; ET Net via Longbridge, November 4

Why an American vote hit Tokyo's chip stocks

The chain of reasoning in the market was political, not technological. “Global equity markets have already begun pricing in the view that a Democratic advantage would create headwinds for AI-related stocks,” said Masahiro Yamaguchi, head of investment research at SMBC Trust Bank, pointing to fears that a Democratic-controlled Congress could bring tighter rules and limits on AI data-centre development and slow the spending boom that orders Asia's chips, memory and cables. The Associated Press reported the same logic on Wall Street: some investors believe Democratic control of both chambers could lead to stricter rules for AI, though President Donald Trump remains in office with veto power, making new federal legislation harder to pass. Japan's market, closed on Tuesday for a holiday, also had a day of positioning to catch up on — strategists described part of Wednesday's drop as delayed unwinding of AI trades.

Source: SMBC Trust Bank via Reuters/ET Net, November 4; Associated Press, November 4

Seoul, Taipei and the rest of the region

South Korea's Kospi fell 3.9 percent and Taiwan's Taiex 3.2 percent in the Dow Jones session report, both markets being heavily exposed to AI chips; the Associated Press snapshot put the Kospi down 3.2 percent at 5,466.83, with SK Hynix down 3.2 percent and Samsung Electronics down 1.8 percent. In Taiwan, the Taiex briefly broke below 42,000 in the morning before recovering part of the loss — it stood at 42,386.33, down 2.13 percent, by 0432 GMT, with TSMC down 1.96 percent and MediaTek down 3.40 percent, according to Nikkei Asia figures carried in market reports. Mainland China barely moved by comparison: the Shanghai Composite ended the morning down 0.10 percent at 3,604.37 while the Shenzhen Component rose 0.14 percent, and Hong Kong's Hang Seng was little changed.

Source: Dow Jones Newswires, November 4; Associated Press, November 4; Nikkei Asia via market reports, November 4

The results behind the sell-off were still being counted. Dow Jones reported that Democrats flipped Senate seats in South Carolina and North Carolina and held seats in Georgia and New Hampshire, with Republicans increasingly pessimistic about retaining control of Congress; the Associated Press reported Democrats had regained control of the Senate while the House remained too early to call in its snapshot, and Reuters noted prediction markets pointing to a possible Democratic sweep, with nearly $1.5 billion wagered on the elections. In other words, Asia's markets were trading on a prospect — a likely Democratic Congress — not on a certified final result.

Source: Dow Jones Newswires, November 4; Associated Press, November 4; Reuters, November 4

The same early results moved the havens in the opposite direction in early trade: gold rose as the dollar softened, in a session this desk reported separately on Wednesday morning. Read: Gold rises to $3,947 as the dollar weakens on Democrats' early midterm wins

What happens next

What happens next starts with the completed US counts: if the Democratic sweep the market priced in is confirmed seat by seat, strategists expect the AI-scrutiny trade to stick; if late counts narrow the result, part of Wednesday's fall could unwind as quickly as it came, especially in Tokyo, where a holiday backlog exaggerated the move. The next hard data point is the US employment report on November 6, and after that the question moves from prices to policy — what a new Congress actually proposes on data centres, and what President Trump, who keeps the veto, signals he would sign. For Asia's chip belt — Japan's equipment makers, Korea's memory giants and Taiwan's foundries — the answer decides whether Wednesday was a one-day political squall or the start of a repricing of the whole AI build-out.