Asian markets delivered a second wave of gains on May 22, 2026, extending the AI-driven semiconductor rally that had already produced historic single-session moves earlier in the week. The headline of the day was not the indices that had already surged — it was the ones that had been left behind. South Korea’s KOSDAQ surged 4.99%, as smaller semiconductor and AI ecosystem stocks finally caught up with the blue-chip rally that sent the KOSPI up 8.42% the day before. Japan’s Nikkei 225 rose 2.68% to 63,339, extending its AI hardware rally into a third consecutive session. China and Hong Kong, which had reversed sharply on May 21, rebounded in tandem. Taiwan was closed for a public holiday and is excluded from this analysis.
South Korea: KOSDAQ Steals the Spotlight with +4.99%
The KOSPI gained a comparatively modest 32 points (+0.41%) to close at 7,847.71, trading in a range of 7,780.13 to 7,886.64. After surging 8.42% on May 21 — its largest single-day gain in recent memory — the KOSPI’s mild consolidation was entirely expected. The index has now absorbed Nvidia’s blowout Q1 FY2026 earnings, the suspension of the Samsung Electronics workers’ strike, and two consecutive days of oil price decline from Iran deal optimism. Large-cap names Samsung Electronics and SK Hynix had already re-rated substantially.
The real story on May 22 was the KOSDAQ, which surged 55.16 points (+4.99%) to close at 1,161.13 — its high of the session — against an open at 1,119.43. This is a textbook “second-wave” pattern: after large-cap semis (KOSPI) absorbed the initial Nvidia demand shock, capital rotated downstream to smaller-cap AI infrastructure, fabless design, and materials companies listed on the KOSDAQ. These names have deeper operational exposure to AI-linked demand but with greater execution uncertainty, which explains the lag and then the catch-up. The KOSDAQ’s 4.99% gain in a single session, on top of May 21’s 4.73% rise, represents a two-day cumulative gain of nearly 10% for Korea’s small-cap technology market.
Why the KOSDAQ Moves Matter for Global AI Investors
The KOSDAQ houses many of Korea’s second-tier semiconductor suppliers — companies providing advanced packaging materials, PCB substrates, test equipment, and specialty gases to Samsung, SK Hynix, and their Tier-1 suppliers. When Nvidia’s forward guidance signals sustained or accelerating AI GPU demand, the earnings upgrade cycle flows through Samsung and SK Hynix first (KOSPI effect), then into their supply chains (KOSDAQ effect). May 21 to May 22 is a real-time illustration of this cascade. Investors tracking Korea’s AI supply chain can monitor relevant economic indicators on the ECONPLEX Indicators page.
Japan: Nikkei Above 63,000 for Second Straight Day
The Nikkei 225 closed at 63,339.07 (+2.68%), adding 1,654.93 points on an open of 61,913.36 and an intraday range of 61,842.56 to 63,432.41. The Nikkei is now within 2.4% of its 52-week high of 63,799.32 set on May 14.
Japan’s market continues to operate as a high-beta expression of the global AI hardware cycle. Tokyo Electron, Advantest, and other semiconductor equipment makers are core Nikkei constituents with direct revenue exposure to Nvidia’s GPU production chain — these names function as proxy bets on AI capex acceleration. The multi-session run is also supported by a stable USD/JPY at 159.16 (+0.08%), which poses no headwind for Japan’s export-oriented industrial base. A sharply stronger yen would compress exporters’ earnings; at current levels, the currency is neutral.
The Nikkei has now gained more than 3,500 points (approximately +5.8%) over the May 20–22 three-session window, reversing the softness of the prior two weeks and positioning Japan as one of the strongest beneficiaries of the AI capex narrative among major global markets.
China and Hong Kong: A Controlled Rebound
Both Chinese equity markets corrected their May 21 disconnect and returned to positive territory on May 22. The Shanghai Composite gained 35.62 points (+0.87%) to close at 4,112.90, recovering roughly half of the prior session’s 2.04% decline. The CSI 300 advanced 1.30% to 4,845.10, recovering more decisively.
The Hang Seng in Hong Kong rose 219.51 points (+0.86%) to 25,606.03, also retracing part of May 21’s loss. The symmetry of the bounce — roughly matching the magnitude of the prior session’s decline — suggests this was primarily a technical recovery rather than a reassessment of the AI earnings narrative. China’s AI chip producers remain structurally excluded from the Nvidia supply chain under current U.S. export controls, but domestic demand for computing infrastructure and AI investment spending continues to support Chinese tech names in a separate, parallel cycle.
Taiwan: Closed
The Taiwan Weighted Index (TAIEX) did not trade on May 22 due to a public holiday. TSMC and other Taiwan-listed names that are core Nvidia supply chain beneficiaries will resume trading on Monday, May 25. Given the Nikkei and KOSDAQ strength observed on May 22, Taiwan markets may face catch-up demand when they reopen.
Macro Backdrop
WTI crude oil recovered to $97.75/bbl (+1.45%) after two consecutive sessions of decline, trading a range of $95.53 to $99.41. The bounce is broadly consistent with a technical correction after an 8.82% Iran deal-driven crash on May 20 and a further 1.94% decline on May 21. At $97.75, WTI remains significantly below its pre-Iran-deal level above $107, maintaining the favorable energy cost backdrop for Asia’s oil-importing economies.
The U.S. 10-year Treasury yield edged down to 4.575% (−0.20%), providing a marginally supportive signal for risk assets. USD/JPY settled at 159.16, essentially unchanged from the prior session, keeping the yen’s impact on regional sentiment neutral. The prior U.S. session (May 21) closed with the Dow +0.55%, S&P 500 +0.17%, and Nasdaq +0.09% — a modest positive hand-off to Asian markets.
Summary Table
| Index / Instrument | Close | Change |
|---|---|---|
| KOSPI | 7,847.71 | +0.41% |
| KOSDAQ | 1,161.13 | +4.99% |
| Nikkei 225 | 63,339.07 | +2.68% |
| Shanghai Composite | 4,112.90 | +0.87% |
| CSI 300 | 4,845.10 | +1.30% |
| Hang Seng | 25,606.03 | +0.86% |
| TAIEX | Closed (public holiday) | |
| WTI Crude Oil | $97.75/bbl | +1.45% |
| USD/JPY | 159.16 | +0.08% |
| US 10-Year Yield | 4.575% | −0.20% |
Source: Investing.com
Three Things to Watch Into Next Week
1. Taiwan catch-up on Monday. TAIEX did not trade on May 22, meaning TSMC and the Nvidia supply chain have a pending two-session gap to close when Taiwan reopens on Monday, May 25. Given the strength of the Nikkei (+2.68%), KOSDAQ (+4.99%), and CSI 300 (+1.30%) over the same period, there is meaningful pent-up upside demand in Taiwan’s market. Whether TSMC gaps up or gaps down will be an early signal for the durability of the AI rally heading into June.
2. Iran deal status. WTI’s 1.45% bounce on May 22 (after two days of decline) may reflect early doubts about whether a formal ceasefire agreement will be reached on the originally expected timeline. Oil remains the macro swing factor: a confirmed Iran ceasefire could push WTI back toward $90 and provide another risk-on impulse for Asia, while a collapse of talks would reverse the oil decline sharply. Watch U.S.–Iran negotiation headlines through the weekend. Track oil price movements via the ECONPLEX Economic Calendar.
3. KOSDAQ sustainability. The KOSDAQ’s near-10% cumulative two-day gain (+4.73% on May 21, +4.99% on May 22) reflects very rapid capital reallocation into Korea’s small-cap AI ecosystem. Whether this is sustained depends on whether the Nvidia-driven AI capex cycle produces actual order flow for KOSDAQ-listed suppliers in the coming weeks. Watch for any guidance updates from Samsung Electronics or SK Hynix, as well as any Nvidia-related commentary in upcoming investor events.
Stay ahead of macro releases and central bank events relevant to Asian markets with the ECONPLEX Economic Calendar.