Wall Street’s Chip Bounce Stops at Seoul: Kospi Tumbles 3.7% as Asia’s AI Selloff Deepens

Wall Street’s relief rally did not travel. Asian chip stocks slid again on Tuesday, October 20, with Seoul hit hardest, even after U.S. technology shares rebounded on Monday and American semiconductor stocks snapped a long losing streak. The closing numbers reported by dpa-AFX tell the story plainly: South Korea’s Kospi tumbled 3.73 percent to 5,552.74, Tokyo’s Nikkei 225 fell 1.30 percent to 64,075.42, and Hong Kong’s Hang Seng fell 1.32 percent to 23,867.74. The one market in the region that finished higher was mainland China, where the Shanghai Composite edged up just 0.12 percent to 3,735.37. For investors who had hoped Monday’s bounce in New York would reset sentiment in Asia, Tuesday was a clear answer: not yet.

Seoul leads the slide

Seoul was where the damage was deepest, and it was chip-led from the start. dpa-AFX reported that Seoul stocks plummeted in a chip-led AI sell-off after bond prices fell at cloud provider CoreWeave, with the Kospi ending down 3.73 percent after rising for two consecutive sessions. The index heavyweights did the dragging: Samsung Electronics, SK Hynix and SK Square each lost between 3 and 5 percent on the close, dpa-AFX said, on concerns over investment in the artificial intelligence value chain.

The early trade had already signaled a rough day, though the opening snapshot was different from the close and should be read as such. Livemint reported the Kospi down 3.5 percent at the opening bell, with SK Hynix down 4.07 percent early and Samsung Electronics down 1.03 percent in that early snapshot. Invezz, reporting intraday at 11:20 a.m. in Seoul, had the Kospi down 2.36 percent at 5,631.95 after touching 5,493.24, before the market weakened again into the close reported by dpa-AFX. Keeping those snapshots separate matters: the story of Tuesday is not one number, but a market that opened weak, tried to pare losses mid-session, and still finished near its lows.

Livemint also put the scale of the retreat in context. The Kospi’s gain for 2026 has now been trimmed to about 31 percent, down sharply from nearly 116 percent at its record closing high in June. That is still a strong year on paper, but the direction of travel explains the nervousness: a market that had more than doubled at its peak has given back a large share of that advance, and chip names that powered the rise are now leading the fall. Kiwoom Securities analyst Han Ji-young, cited by Invezz, said a sustained Kospi recovery would require the benchmark to reclaim its 200-day moving average near 6,410 — well above Tuesday’s close of 5,552.74, and a reminder of how far the index would need to climb before technicians would call the damage repaired.

Tokyo follows, Hong Kong returns lower

Tokyo’s losses were smaller than Seoul’s but broad. dpa-AFX reported the Nikkei 225 down 1.30 percent to 64,075.42, with technology stocks under selling pressure on concerns over credit risks and profitability surrounding AI investments, and the broader Topix down 1.43 percent to 4,009.21. The individual losses at the close were steep: SoftBank Group, Fujikura and Furukawa Electric led losses, each closing about 6 percent lower, according to dpa-AFX.

Again, the early snapshot was milder than the close. Livemint reported SoftBank Group down 4.46 percent in early trade, with the Nikkei down 1.21 percent in morning deals, while Invezz had SoftBank down about 3.3 percent early in its intraday account. The shares weakened further from there to the roughly 6 percent closing declines reported by dpa-AFX — a pattern, in both Seoul and Tokyo, of selling that built through the day rather than fading after the open.

Elsewhere in the region, Hong Kong’s Hang Seng fell 1.32 percent to 23,867.74 on its return from Monday’s holiday, dpa-AFX reported, after strong Chinese GDP data dampened expectations for additional stimulus. Australia also finished lower on closing figures from dpa-AFX, though its early drop was larger: Livemint had Australia’s S&P/ASX 200 down 0.84 percent in early trading, while Taiwan’s Taiex turned positive in early trade. The regional picture, in other words, was not uniform panic — it was concentrated selling in the markets and stocks most tied to the AI trade, with Seoul and Tokyo at the center.

The Wall Street contrast

What made Tuesday in Asia harder to dismiss is what had happened overnight in the United States. TradingKey reported that on Monday the Nasdaq Composite rose 1.11 percent to 26,430.89, the S&P 500 rose 0.41 percent to 7,690.73, and the Dow Jones Industrial Average eased 0.07 percent to 51,966.03. More pointedly for chip investors, TradingKey reported the Philadelphia Semiconductor Index rose 1.6 percent, snapping an eight-session losing streak, with memory stocks among the notable gainers in that session.

In a normal week, that kind of U.S. session — a Nasdaq gain of more than 1 percent and a first up day for the chip index after eight straight losses — would be expected to give Asian semiconductor shares at least a steadier open. Instead, as Invezz put it, Asian markets weakened despite Wall Street’s overnight chip stock rebound, with investors unwilling to rebuild exposure to Asia’s biggest AI trades before a crucial earnings week. The bounce, for now, is being treated in Seoul and Tokyo as a U.S. event, not a global all-clear.

Why Asia did not follow the bounce

The coverage points to debt, as much as demand, as the reason. dpa-AFX reported renewed concerns over AI-related investments, and noted that S&P Global has warned hyperscalers could be carrying more AI-related debt than is currently visible through financing structures linked to data centers and smaller AI firms. That warning goes to the heart of the current anxiety: the AI build-out is being financed through layers of structures, and investors are questioning how much leverage sits underneath the spending, and whether the returns will arrive fast enough to justify it.

Seoul had a more specific trigger as well. dpa-AFX tied the Korean sell-off directly to a fall in bond prices at cloud provider CoreWeave — a reminder that in this phase of the AI trade, credit markets can move equity markets. When the bonds of a prominent cloud provider fall, shareholders in its suppliers and peers, including Korean memory makers, tend to feel it quickly. Invezz added local pressure points of its own, including renewed foreign selling in Korean chips a day after a Monday rebound, but the through-line across the coverage is the same: financing and profitability questions around AI capacity, not a sudden collapse in demand for chips themselves.

Commodities underlined the uneasy backdrop rather than driving the day. dpa-AFX reported gold was subdued around $4,123 an ounce in Asian trade, while Brent crude rose nearly 1 percent above $110 a barrel — oil at that level keeps inflation and borrowing-cost concerns alive for markets already worried about yields and debt.

China holds steady, and the regional spillover

China was the exception that proved the regional rule. The Shanghai Composite edged up 0.12 percent to 3,735.37, dpa-AFX reported, after the People’s Bank of China left its benchmark lending rates unchanged for the 17th straight month, in line with market expectations. Previously covered that decision separately — see China keeps its loan prime rates unchanged for a 17th month — and Tuesday’s flat-to-slightly-higher close in Shanghai suggests mainland investors, for one day at least, took the steady hand from the central bank as enough.

The contrast with the rest of the region is also visible beyond the chip markets. Previously has been tracking the separate, sharper rout in Indonesia — see Indonesia’s markets rout, day two — and while the drivers there are different, together the stories describe an Asia-Pacific region where investors are discriminating sharply between markets rather than buying or selling the region as a single block.

What comes next

The immediate test is earnings. dpa-AFX reported investors braced for results from the world’s biggest technology companies, with Tesla and Meta among the names cited in the coverage, and Livemint likewise noted a busy earnings week with Tesla and Meta Platforms awaited. Those results will be read in Asia for more than headline profit: guidance on AI spending, and on how that spending is being financed, is what Seoul and Tokyo are actually trading on right now.

Until then, the technical picture Han Ji-young described leaves little room for complacency in Korea. A close at 5,552.74 against a 200-day average near 6,410 means the Kospi would need a substantial, sustained climb — not a single bounce — before the recovery case is credible on his terms. Tuesday showed the opposite: a market given every excuse by Wall Street to rally, which chose instead to sell its chip leaders by 3 to 5 percent and its Japanese AI bellwethers by about 6 percent. Whether that is capitulation or simply caution before earnings is the question the rest of the week will answer. On Tuesday’s closing evidence, Asia is not buying the bounce yet.

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