Asia markets on May 4, 2026 were unusually concentrated because several major exchanges were shut for holidays. South Korea delivered the clearest move of the session, with the KOSPI jumping 5.12% and the KOSDAQ rising 1.79%, while Singapore’s Straits Times Index edged higher. Japan and mainland China were excluded from today’s trading read because Investing.com’s stock market holiday calendar showed Tokyo closed for Greenery Day and Shanghai closed during the Labor Day holiday period.
Asia Market Snapshot for May 4
With Tokyo and mainland China offline, the day’s regional signal came mostly from Seoul, Singapore, and the available Hong Kong and Taiwan index marks. CNBC quote data showed the KOSPI Index closing at 6,936.99, up 338.12 points or 5.12%, and the KOSDAQ at 1,213.74, up 21.39 points or 1.79%.
- South Korea: KOSPI +5.12%; KOSDAQ +1.79%, both verified by CNBC quote data.
- Singapore: The Straits Times Index rose 0.24% to 4,924.31.
- Hong Kong: CNBC’s Hang Seng Index page showed 26,095.88 for May 4, but the quote record carried unchanged fields, so this post does not treat Hong Kong as a directional driver.
- Taiwan: CNBC’s Taiwan Weighted quote showed 40,705.14 for May 4, also with unchanged fields, so it is used only as a reference mark.
- Excluded: Japan and mainland China were closed, according to the Investing.com holiday calendar.
South Korea Led the Open Markets
The most important confirmed move came from Seoul. The KOSPI finished at a new 52-week high in CNBC’s dataset, with the quote record showing a year-high price of 6,937.00 dated May 4. The KOSDAQ also gained, though less dramatically, and remained below its late-April year-high mark.
Because the available verified quote feed does not identify a single news catalyst for the Seoul rally, the cleanest reading is price-action based: Korea was the strongest confirmed open market in Asia, and the move was large enough to dominate a session when Japan and mainland China were not trading.
Japan and Mainland China Were Not Part of the Trading Signal
Japan’s Nikkei 225 and TOPIX were excluded from today’s market read because Tokyo was closed for Greenery Day. Mainland China’s Shanghai and Shenzhen markets were also excluded because the Labor Day holiday period kept Shanghai closed, according to the same Investing.com holiday calendar.
That matters for interpretation. When both Japan and mainland China are closed, regional breadth can look thinner than usual. A strong move in Seoul can dominate Asia headlines, while Hong Kong, Taiwan, and Singapore provide narrower confirmation rather than a full regional risk-on signal.
Hong Kong, Taiwan, and Singapore: Mixed Read, Limited Confirmation
CNBC’s Hang Seng quote page showed the Hang Seng Index at 26,095.88 on May 4, but the underlying quote record showed unchanged fields and zero volume, so this post avoids assigning a directional move to Hong Kong. The Taiwan Weighted Index was similarly shown at 40,705.14 with unchanged fields in the available quote record.
Singapore offered a clearer move. CNBC showed the Straits Times Index up 0.24% at 4,924.31. That was modest compared with Korea, but it still kept Singapore on the positive side of the ledger.
Macro Context: Thin Holiday Trading and Tech Themes
The most defensible macro point is liquidity and coverage, not a sweeping regional narrative. CNBC’s Asia Markets page and World Markets page provide the live-market framework, but the holiday schedule limited the number of major Asian exchanges contributing to the day.
Technology and AI remained a relevant background theme for Asia investors. CNBC reported on May 1 that China’s EV price competition was evolving into an AI feature race, with companies pushing in-car AI tools as price competition intensified. That does not explain every May 4 index move, but it does show why investors continue to watch Asia’s technology, EV, and semiconductor-linked markets closely.
What Investors Should Watch Next
After a holiday-thinned session, the next test is confirmation. Investors should watch whether Korea’s sharp advance holds when Japan and mainland China return to trading, whether Hong Kong and Taiwan show clearer directional follow-through, and whether U.S. rates, the dollar, and technology-sector headlines reinforce or challenge the move.
For ECONPLEX readers, the practical dashboard is simple: compare Korea’s KOSPI and KOSDAQ pages with Hong Kong’s Hang Seng Index, Taiwan’s Taiwan Weighted Index, and Singapore’s Straits Times Index as the rest of Asia comes back online.
CTA: Use ECONPLEX’s market indicator pages to track whether today’s Korea-led move broadens into a wider Asia market trend.