Asia's Chip Rout Deepens: Kospi Halts Trading as Hot Inflation Revives Rate-Hike Bets
South Korea's bourse operator suspended trading in Kospi-listed shares for 20 minutes starting at 12:38 p.m. local time on Thursday, after the benchmark fell more than 8% from the previous close, Yonhap reported. The index traded near 5,539 at one point, down about 7.8% on the day; it opened more than 5% lower, triggering a sell-side sidecar halt early in the session. The move stretched the Kospi's losing streak to seven straight sessions, its longest since September 2024.
Samsung Electronics fell 9.05% and SK Hynix plunged 11.06% intraday, according to India Today and Business Today; early Associated Press figures put the declines at 8.2% and 10.8%. SK Hynix has now given up 57% of its market value from a peak four months ago, Moneycontrol noted. The damage spread well beyond Seoul: Japan's Nikkei 225 dropped 3.9% to 65,119.51 early and widened to 4.53% at 64,659.88, Hong Kong's Hang Seng shed roughly 1% to 24,071, Shanghai's Composite lost 1.45% and Taiwan's Taiex fell 2.79%. The MSCI Asia-Pacific ex-Japan index was down about 1.2%.
The trigger was US September CPI, published on 14 October: headline prices rose 0.6% on the month and 3.7% year on year, above the 3.6% consensus and August's 3.4%. Core CPI climbed 0.3% month on month and 2.6% year on year, beating forecasts of 0.2% and 2.5% and marking the fastest pace in five months. The Fed had delivered its first hike since 2023 in September, lifting the target range to 3.75%–4.00%. Before the print, CME FedWatch showed roughly a 77.3% chance the Fed would hold at its 27–28 October meeting. Within 24 hours of the data, Polymarket's price on a quarter-point October hike jumped from about 18% to 47.5%, while December hike odds sat near 87.8%.
US stocks closed lower on Wednesday: the S&P 500 fell 1.11% to 7,718.94, the Nasdaq Composite dropped 1.88% to 26,692.87 and the Dow slipped 0.09%. Nvidia lost 3.16%, Meta 3.27%, Tesla 2.15%, Microsoft 1.80% and Amazon 1.74%. Apple was the lone gainer among the megacaps, up 0.50% to $342.96, becoming only the second company after Nvidia to close above a $5 trillion market capitalisation. Data-centre operator CoreWeave lost more than 15%, Broadcom 3.1% and AMD 5.7%. The 10-year Treasury yield briefly pushed above 5.32% before easing.
Broadcom chief executive Hock Tan compared AI investors to casino gamblers and warned that financing the buildout could become a bigger problem than chip shortages; Intel's CEO has likewise flagged access to capital as a headwind. Competition added to the pressure earlier: on 13 October, China's ChangXin Memory Technologies (CXMT) claimed a breakthrough in memory technology, dragging the Kospi to a 5.46% close at 6,035.35 that day, with Samsung down 7.39% and SK Hynix down 10.09%. Korea's total market value slipped below 5,000 trillion won.
Korea's Financial Services Commission has spent months tightening the plumbing. From 1 October, brokers were limited to extending credit equal to 90% of equity capital; a 15% concentration limit on single stocks takes effect on 19 October; minimum margin requirements are due to rise from 45% to 50% within the year. FSC chairman Lee Eok-won ordered regulators on 1 October to deploy market-stabilisation measures promptly if instability spreads and to keep bond and funding-market backstops rapidly expandable. The Bank of Korea's September financial stability report singled out concentrated, leveraged trades linked to Samsung Electronics and SK Hynix as a volatility amplifier, and the FSC chief publicly apologised on 8 October over the single-stock leveraged ETF episode.
Higher oil is a separate tax on net importers Korea and Japan. Brent traded near $106 a barrel as Houthi attacks on Saudi Arabia fanned supply concerns, even though WTI and Brent had fallen earlier in the week, to $92.66 and $105.52 on 13 October.
Lazard's Ronald Temple argued that broadening inflation pressures leave the Fed "increasingly at risk of falling behind the curve", while Regan Capital's Skyler Weinand expects a hold in October and hikes resuming in December. Vital Knowledge's Adam Crisafulli told CNBC the sell-off "reflected extreme positioning imbalances that have further to unwind", making a sharp V-shaped rebound unlikely. Ray Dalio has called the AI boom a "classic bubble" approaching its burst point, and Panmure Liberum strategist Joachim Klement targets the S&P 500 at 5,000 by end-2027 — roughly 36% below its 7 October close of 7,801.77. Michael Burry is betting against Micron and Nebius via put options.
TSMC reports third-quarter results on Thursday. LSEG's SmartEstimate of 16 analysts expects net profit up about 65% year on year to NT$746.3 billion (roughly $23.4 billion), a sixth straight record, on revenue of NT$1.49 trillion — up 50%. The company has guided 2026 capital spending at $60bn–$64bn. The key is whether capex and the 2027 outlook can keep the "AI demand is real" narrative intact. Two other dates matter: the Fed's 27–28 October meeting, with the decision due on the 28th, and the pace at which CXMT's memory capacity actually lands.