South Korea’s KOSPI smashed through its all-time record on Tuesday, surging 2.72% to close at 6,388.47 — a fresh 52-week and all-time high. The driver was unmistakable: a roaring AI-linked semiconductor rally fueled by SK Hynix and Samsung Electronics, layered on top of easing Mideast tensions and South Korean chip exports hitting their own record. Elsewhere in Asia, markets were more subdued — gains in Tokyo and Hong Kong, but a near-flat session in Shanghai as Iran diplomacy remained unresolved.
South Korea: KOSPI Hits All-Time Record on AI Semiconductor Surge
The KOSPI opened at 6,302.54 and never looked back, reaching an intraday high of 6,388.47 before closing there — marking the first time the index has ever closed at this level. Nikkei Asia attributed the move to easing Middle East tensions and a sustained rally in the tech sector, with AI-linked companies at the center of the story.
Samsung SDI was the standout large-cap name, rocketing +19.89%. Solus Advanced Materials surged +26.07% on battery materials demand. HD Hyundai Marine Solution climbed +17.53%. Construction also participated — Daewoo Engineering & Construction rose +16.90%, the most actively traded stock on the day with 94.2 million shares changing hands.
The backdrop for the tech outperformance is structural. SK Hynix filed for a U.S. stock market listing to fund its AI-chip capacity expansion — a signal of how aggressively Korean memory makers are betting on AI-driven demand. Meanwhile, industry analysts now expect the memory shortage to persist until 2027 as chipmakers divert capacity toward AI processors. That supply-demand math has investors pricing Korean chip stocks at a significant premium.
The KOSPI’s 1-year gain now stands at +156.73% — one of the strongest performances among major global equity benchmarks.
Japan: Nikkei Gains 0.89% Led by Semiconductors and SoftBank
The Nikkei 225 rose 524.28 points (+0.89%) to 59,349.17, with a session range of 59,004.76 to 59,611.91. The move was tech and semiconductor-led, echoing the Korean surge.
Ibiden led Nikkei gainers at +10.29% — the packaging substrate maker is a key supplier to Nvidia and Intel, making it a direct beneficiary of AI server demand. Kioxia Holdings (the NAND flash giant that recently listed) gained +7.31%, and memory-adjacent name Resonac Holdings rose +6.64%. SoftBank Group surged +8.53%, the most actively traded stock on the Tokyo exchange, buoyed by its deepening AI investments via OpenAI. Cable maker Fujikura added +6.51% on data center infrastructure demand.
On the downside, software firm Shift fell -6.33% and healthcare IT company M3 Inc. declined -4.10%. Regional bank Chiba Bank dropped -4.01% as financials lagged the rally. Dentsu lost -3.90%.
The Nikkei’s performance lagged KOSPI, in part because Japan’s market has a broader mix of sectors — utilities, financial, and export names that are more exposed to energy costs from the ongoing Hormuz disruption. TSMC’s warning that higher gas prices could impact its profit margins also reminded investors that even the semiconductor rally is not immune to energy cost pressures.
China and Hong Kong: Modest Gains as Diplomacy Drags
The Hang Seng Index added 126.41 points (+0.48%) to close at 26,487.48. Contemporary Amperex Technology (CATL) was the standout, surging +4.77% after its Hong Kong listing continued to attract institutional flows. ZTO Express gained +3.40% and Xinyi Solar climbed +3.25%. Chinese banks were broadly steady — ICBC, CCB, and Bank of China all ended marginally higher among the most active names.
The Shanghai Composite essentially flatlined, adding a negligible +0.07% to 4,085.08. The near-standstill in Chinese mainland equities reflects the unresolved nature of U.S.-Iran negotiations, which keeps crude oil pricing unpredictable — a direct input cost risk for China’s energy-intensive manufacturing sector.
One significant policy development: China cut its domestic gasoline price for the first time this year, easing pressure on refinery margins. The move follows a gradual softening in crude oil prices after Iran’s declaration that the Strait of Hormuz is “completely open” — though in practice, tanker traffic remains disrupted and ship operators are still avoiding the strait.
The Macro Picture: AI Mania Versus Geopolitical Friction
Two competing forces drove Asia’s mixed session on Tuesday:
- AI/semiconductor demand cycle: The structural driver remains AI. HBM supply is tight, NAND and DRAM capacity is being redirected to AI processors, and the resulting memory shortage is forecast to run through 2027. Markets that are heavily weighted to this theme — Korea above all — are outperforming sharply.
- Geopolitical uncertainty: The VIX rose modestly to 19.07 (+1.06%), indicating that despite the equity euphoria, options markets are still pricing residual geopolitical risk. U.S.-Iran talks continued through the weekend without a final deal. The ceasefire remains in force but Hormuz shipping lanes are not fully operational.
India’s BSE Sensex rose +0.96% to 79,273.33, outperforming the Chinese market and tracking the broader Asian tech narrative. The S&P 500 closed at 7,129.53 (+0.29%) on Monday, providing a soft tailwind into Asia’s Tuesday open.
What to Watch the Rest of This Week
- SK Hynix U.S. listing progress: The IPO filing is a major event for Korean chip sentiment. Any pricing news or roadshow updates will move both SK Hynix and Samsung.
- Warsh Fed hearing: Kevin Warsh’s Federal Reserve chair hearing this week is a pivotal macro event. Markets are pricing in a hawkish lean, but any dovish signal could accelerate the Asia rally further. Watch the Fed funds rate page for real-time updates.
- U.S.-Iran diplomacy: A ceasefire extension — or breakdown — will immediately reprice oil and regional equity risk. Energy stocks in Japan and Hong Kong are the most exposed.
- TSMC earnings: Taiwan Semiconductor’s quarterly results are in focus. The company flagged higher gas costs as a profit risk — the guidance on margins and AI chip demand will set the tone for regional semis.
- China stimulus signals: With Shanghai barely moving despite broader Asia gains, watch for any fiscal or monetary signals from Beijing. The LPR is already on hold — additional targeted support for manufacturing or property could break the stalemate.
Track the KOSPI, Nikkei, and all key Asian indices in real time on ECONPLEX Indicators. Check this week’s key economic events — including the Warsh hearing and TSMC results — on the economic calendar.