Nikkei Hits Record, KOSPI Surges 3.7% as Samsung HBM4E Drives AI Chip Rally — Asia Markets June 1, 2026

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Monday, June 1 opened the new trading month with a bang across Asia’s major exchanges, as the global AI-driven tech rally continued to overpower fresh geopolitical headwinds. Korea’s KOSPI powered to new all-time highs, driven by Samsung’s historic HBM4E milestone and continued AI chip momentum. Japan’s Nikkei 225 also set a new record intraday peak. The session’s dominant narrative, as Barron’s described it: “Record-Breaking Tech Rally Rolls On as Markets Look Past Fresh U.S.-Iran Strikes.”

Korea: KOSPI Hits All-Time High on Samsung HBM4E News

The session in Seoul delivered one of the most consequential trading days of the year. The KOSPI Composite closed at 8,788.38 (+312.23 / +3.68%), after touching a new 52-week high of 8,874.16 intraday — a level not seen in the index’s history. The KOSPI 200, which tracks the 200 largest listed companies, surged to 1,399.91 (+4.25%), also touching a new all-time intraday record of 1,412.58.

The primary catalyst was Samsung Electronics. Business Wire reported that Samsung had begun shipments of industry-first HBM4E (High Bandwidth Memory 4E) samples — the most advanced memory chip architecture for AI accelerators currently available. Samsung’s stock surged +10.09% to 349,000 won, lifting the index disproportionately given Samsung’s dominant weight.

The HBM4E news builds on a broader re-rating of Korea’s semiconductor complex. As Reuters reported last week, SK Hynix had crossed the $1 trillion market cap threshold — making South Korea the first country outside the US to have two $1 trillion companies, alongside Samsung. Memory chip prices doubled in Q1 and are forecast to rise a further 63% in Q2 due to AI data center demand, per analyst estimates cited by Reuters.

Meanwhile, the KOSDAQ again diverged sharply, closing at 1,050.03 (−2.30%). The same rotation dynamic seen last Friday continued: institutional money flowed into KOSPI large caps while growth and biotech names on KOSDAQ were sold. USD/KRW traded near 1,508.30, with the dollar holding firm — a slight headwind for KOSDAQ-listed importers but broadly neutral for large-cap exporters.

Japan: Nikkei Sets New Record Peak

The Nikkei 225 closed at 66,934.33 (+604.83 / +0.91%), extending its run of record closes. The intraday high of 67,231.28 was a new 52-week peak. Barron’s confirmed “Nikkei Rises to Record, Led by Tech Stocks” — with semiconductor-related names and AI infrastructure plays outperforming on the back of the same global tech tailwind lifting Korea.

Japan’s gains were more contained than Korea’s because the direct Samsung/HBM4E catalyst is a Korean story, but the broader AI chip demand narrative underpinned by Nvidia’s ecosystem benefited Japan’s DRAM-adjacent and equipment makers.

Hong Kong and Australia: Diverging Outcomes

The Hang Seng Index closed at approximately 25,398.18 (+0.86%), rising modestly on regional tech sentiment and China-related AI optimism. The Hang Seng China Enterprises Index (HSCEI) also gained +0.97%.

Australia’s S&P/ASX 200 was essentially flat, closing at 8,729.40 (−0.03%). The index was caught between positive tech sentiment and the sharp reversal in Brent crude — which surged on renewed tensions, creating a mixed signal for Australia’s resource-heavy index.

Macro Variables: Oil Surges, VIX Rises

The session’s macro backdrop presented a notable tension. On one hand, the AI tech rally was powering markets forward. On the other, fresh US military strikes on Iran sent Brent crude sharply higher to approximately $94.01 (+3.17%) — reversing a significant portion of last week’s ceasefire-driven decline.

The VIX also ticked up to 15.77 (+2.94%), reflecting increased near-term uncertainty heading into Monday’s US session. Markets appeared to be in a dual-track mode: the structural AI trade pressed higher, while geopolitical risk re-entered the picture. The divergence between KOSPI mega-caps (winning) and KOSDAQ growth names (losing) reflects this bifurcation precisely.

MT Newswires confirmed the split narrative, headlining “Tech Optimism Lifts Asian Stock Markets” — yet the Brent spike and VIX uptick signalled that the Iran situation had not been fully resolved.

What Investors Should Watch

  1. Iran ceasefire status: The 60-day framework agreed last week is being tested by fresh US strikes. Whether the deal holds or fractures will determine the direction of oil and the VIX heading into the week. Track the outlook via the Economic Calendar.
  2. Samsung HBM4E demand response: Today’s shipment announcement is the first concrete signal that Samsung is back in the HBM supply chain at the cutting edge. Watch SK Hynix’s response and any Nvidia supply-chain commentary.
  3. KOSDAQ recovery timing: Two consecutive sessions of KOSDAQ underperformance (−2.68% Friday, −2.30% Monday) against KOSPI gains suggest a deep rotation in progress. When the rotation plateaus, KOSDAQ’s cheaper valuation may attract re-entry.
  4. Brent crude direction: A Brent move back toward $95+ would reintroduce inflation risk and pressure the Fed rate outlook. Conversely, if the ceasefire holds and oil retreats, risk assets should continue benefiting.

Sources:

Track the tech rally in real time: Monitor KOSPI, Nikkei, and Brent crude on ECONPLEX. Don’t miss this week’s key market events on the Economic Calendar.

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