AI Optimism Ignites Asian Markets; Korean Shares Surge 17%

Korean Shares Lead Asian Rally on Renewed AI Enthusiasm

South Korean equities soared 17% on Thursday, leading a broad rally across Asian markets as renewed excitement around artificial intelligence sent chip and technology shares sharply higher. The surge came alongside a decision by the Bank of Japan to leave monetary policy unchanged while it assesses the impact of its most recent rate increase on growth and prices.

The yen simultaneously strengthened 3% against the dollar, fueling speculation that Japanese authorities intervened to prop up the currency after officials stepped up verbal warnings against speculative moves that risk accelerating domestic inflation. The broader macro backdrop remained mixed: U.S. second-quarter GDP rose at an annual rate of just 1.5%, missing forecasts, while the core PCE price index cooled in June but stayed well above the Federal Reserve’s 2% target.

A surprise contraction in China’s official manufacturing PMI — the first in five months — added to pressure on Beijing to support growth. In Europe, U.K. inflation eased to 2.6% on lower energy and food costs, and the eurozone continued to show resilience despite supply-chain disruptions. Against this complicated macro picture, the European Union announced a tender to support up to seven AI facilities, aiming to bolster the bloc’s technology capabilities.

What’s Driving the AI Surge and the Cross-Currents of Central Bank Policy

AI Mania Returns — For Now

The sudden burst of AI enthusiasm lifted Asian semiconductor and hardware names, with South Korea’s heavy weighting to memory chips making it an outsized beneficiary. While the immediate trigger is unclear, the move reflects a resurgence of the narrative that has powered markets for much of the year: that AI-related demand will drive a sustained capex and earnings cycle. The risk is that this narrative has already been priced in during earlier rallies, leaving equities vulnerable to any disappointment.

Central Bank Caution and Currency Intervention

The Bank of Japan’s decision to stand pat removes a near-term headwind for Japanese equities and the broader region. However, the suspected yen intervention signals discomfort with excessive weakness, which could complicate the outlook for Japanese exporters if the yen continues to firm. For global investors, the intervention raises questions about how aggressively the BOJ will eventually normalize policy — and how that might ripple through carry trades and fixed-income markets.

Global Macro Headwinds

The rally sits against a sobering macro backdrop. U.S. growth disappointed and a contraction in China’s factory activity pointed to fading momentum in the world’s second-largest economy. Jobless claims edged higher, and mortgage rates climbed to 6.66%, suggesting that parts of the economy are feeling the strain of higher rates. A persistent global diesel shortage — worsened by Ukrainian strikes on Russian refineries and lower Chinese output — is keeping fuel prices elevated, adding an inflationary impulse that could complicate the Fed’s path. If macro data continue to weaken, the AI trade may quickly lose its gloss.

Tariff overhang

A separate, less visible risk: many executives now expect trade duties to outlast the current U.S. administration, signaling that protectionist measures are becoming structurally embedded in global supply chains. That adds a layer of uncertainty for tech firms with complex cross-border operations.

How Investors Can Navigate the AI Trade and Looming Risks

Watch the AI earnings catalyst. The rally has been built on sentiment; the upcoming quarterly reports from major chipmakers will reveal whether end-demand is matching the hype. A miss could deflate the trade quickly.

Monitor U.S. jobless claims and PCE prints. The below-forecast GDP and cooling core PCE give the Fed room to pause, but if claims continue to rise, recession fears could overtake the soft-landing narrative and hit risk appetite.

Track Japan’s intervention posture. If official data confirm yen-buying, expect sharper two-way risk in USD/JPY, with potential knock-on effects for Japanese equities and the broader Asian FX complex.

China’s stimulus response is now critical. The manufacturing PMI contraction raises the odds of fresh support measures; any announcement could give cyclical and commodity-linked stocks a short-term boost.

Stay alert to diesel-driven inflation. The global supply squeeze is prolonging elevated fuel costs, which will feed into transport and input prices. Companies with high logistics exposure should be assessing margin impacts now.