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Asian Chip Stocks Surge 6% as BoJ Hikes Rates

By Markets Desk · 2026-09-18 · 2 min read
A modern semiconductor wafer resting on a cleanroom table
Illustration: Tradingbird

South Korean and Taiwanese equities hit one-week highs on AI optimism and a 31-year interest rate peak.

South Korean and Taiwanese stock markets posted their highest gains in a week on Friday. The rally was driven by strong performance in semiconductor sectors. MSCI’s emerging Asia equities index rose by as much as 1.7 percent. This movement was fueled by high-weight holdings in South Korea and Taiwan. Regional chip stocks mirrored overnight gains in United States peers. Investor confidence was bolstered by news of advanced AI model deployments. These developments suggest a clear path for monetizing artificial intelligence investments.

Samsung Electronics and SK Hynix led the charge in Seoul. Samsung shares climbed by 3.6 percent while SK Hynix jumped 6.1 percent. In Taipei, the TAIEX index gained 1.7 percent to reach a one-week high. TSMC shares rose by 1.4 percent following a 3.1 percent surge in the Philadelphia Semiconductor Index. A one percent drop in oil prices also supported sentiment in these oil-importing markets. The Philadelphia Semiconductor Index performance provided a direct catalyst for the regional rally.

Bank of Japan hits 31-year peak

The Bank of Japan raised its policy rate to 1.25 percent. This level represents a 31-year high for the central bank. Two board members dissented on the decision. The move aligns Japan with European and US peers in tightening monetary policy. Officials cited global inflation risks from Middle East conflicts and fiscal expansion. Surging demand for AI investment also contributed to the decision.

Capital Economics predicts the policy rate will reach 2 percent by mid-2027. This forecast is more aggressive than current market pricing. The bank’s policy rate could exceed 2 percent if services inflation accelerates. Stronger wage hikes in spring negotiations would also drive this trajectory. The central bank signaled readiness to continue raising borrowing costs. This stance reflects a focus on controlling persistent inflationary pressures.

Currency moves mixed across Asia

The US dollar index held steady at 100.23 on Friday. It edged back from a two-and-a-half-month high seen on Thursday. MSCI’s gauge of emerging market currencies moved slightly higher. The New Taiwan dollar gained 0.4 percent. The Malaysian ringgit rose by 0.5 percent. The South Korean won fell by 0.4 percent. These shifts reflect varying investor responses to the rate hike and equity gains.

Equity performance varied in other parts of the region. Jakarta stocks dropped by as much as 0.9 percent. Thailand’s market gained 0.6 percent despite energy import reliance. The Philippines lost nearly 1.2 percent. This decline pushed the Philippine stock market to a fourteen-week low. Oil prices remained above 100 US dollars per barrel. This factor continued to weigh on some import-dependent economies.

AI monetization drives market optimism

Strategists note that AI monetization is validating capital spending. Hyper-scalers are investing heavily in this technology. Asia remains central to global AI supply chains. This position benefits regional markets as US peers rally. Ecaterina Bigos from BNP Paribas Asset Management highlighted this link. Signs of revenue generation from AI models are key. This trend supports the broader equity rally in the region.

The deployment of AI in pharmaceutical research is a notable driver. This application has reignited optimism among investors. The market is watching for further evidence of commercial viability. Capital expenditure by major tech firms is being justified by these gains. The connection between US and Asian markets is strengthening. This dynamic underscores the global nature of the AI investment cycle.

Based on reporting by The Edge Malaysia, compiled by the Tradingbird desk.

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