US-Iran Tensions Ease and AI Demand Heats Up, Japan and S.Korea Stocks Hit New Highs, Chip Chain Gets Boost
Keywords: US-Iran Relations, Nikkei 225, KOSPI, SK Hynix, HBM4E, Artificial Intelligence, Chip Stocks, Yen Exchange Rate, Bank of Japan
On June 18, Asian financial markets saw a clear recovery in risk appetite. The news of the US and Iran signing a memorandum of understanding continued to ferment, coupled with strong growth in AI demand, pushing Japan and South Korea stock markets to strengthen simultaneously, with both the Nikkei 225 and KOSPI hitting record highs during the session. Meanwhile, global chip stocks generally rose in overnight trading, showing that market optimism toward tech growth sectors is rapidly recovering.
From a macro perspective, this rally is not driven by a single event, but the combined result of easing geopolitical tensions, changing monetary policy expectations, and continued expansion of the AI industry. For capital markets, this means traditional risk-off sentiment is cooling down periodically, and funds are flowing back to high-growth, high-prosperity sectors, especially semiconductors related to AI infrastructure.
Geopolitical Easing Boosts Risk Appetite
Positive market expectations for US-Iran relations became an important external variable for this round of Asian stock market gains. The news of the two sides signing a memorandum of understanding led investors to generally interpret that the Middle East situation may ease periodically, thereby reducing risks of large fluctuations in energy prices and further shocks to the global supply chain. For Japan and South Korea, which are highly dependent on imported energy and have a clear export orientation, this sentiment improvement is particularly crucial.
After risk appetite recovered, funds first flowed to tech and manufacturing sectors with higher valuation elasticity. The Japanese stock market opened high and rose, with the Nikkei 225 surging over 1,300 points at one point, up more than 2%, again hitting a record high; the KOSPI also rose over 1% during the session and hit a new high simultaneously. This shows that the current market rally logic is not a local theme speculation, but carries strong asset allocation revaluation characteristics.
Japan Stock Market Strengthens: Driven by Tech and Manufacturing Dual Engines
Japan's stock market's strong upward momentum benefited from both improved global risk appetite and the continued heat of the AI supply chain. Stocks like SoftBank Group, Kioxia, and Renesas Electronics performed well; Murata Manufacturing surged 17% at one point, while Mitsubishi Heavy Industries, Panasonic, Sumco, and Fujitsu also generally rose. Market funds repricing Japan's manufacturing and tech chains highlights that the AI wave is spreading to broader industry segments.
It is worth noting that Japan's stock market rise in recent years is not entirely dependent on loose monetary environment, but increasingly supported by corporate profit recovery, overseas business growth, and the global tech cycle recovery. Especially in AI servers, memory chips, precision components, and industrial electronics, Japanese companies have strong supply chain positions, making related sectors easier to gain excess returns during industry prosperity.
However, the continued weakening of the yen is also becoming another main line of market attention. On Wednesday, the yen fell to 160.80 against the dollar, and was still fluctuating around 160.62 in early Tokyo trading on Thursday. Behind the dollar's strength, traders are increasing bets that the Fed may still maintain a hawkish stance within the year. Although yen depreciation to some extent improves the overseas revenue conversion of Japanese exporters, it also exacerbates imported inflation pressure and amplifies market concerns about policy intervention.
Monex forex trader Andrew Hazlett noted that the Fed meeting's policy signals leaned hawkish, pushing up the dollar and pushing the yen into a range where "intervention absolutely needs to be considered." This means that if the yen continues to depreciate rapidly, the Japanese government and the Bank of Japan may face greater policy coordination pressure in the future.
After BOJ Rate Hike, Policy Space Still Tested by Market
On June 16, the Bank of Japan raised its policy rate from 0.75% to 1.0%, which is not only an important monetary policy adjustment within the year but also further clarifies the trend of Japan ending the ultra-low interest rate era. The BOJ emphasized in its statement that the rate hike mainly stems from rising risks of accelerating price increases, especially the cost pass-through from rising crude oil, which is spreading faster to the consumer side. The central bank also warned that after excluding temporary factors, price increases may exceed the 2% inflation target risk.
However, the market has not completely relieved concerns about the yen. Deputy Governor Uchida Shinichi's remarks indicate that the monetary tightening cycle is not over; whether further rate hikes follow depends on the economy and inflation trends. Although this statement reflects the BOJ's determination to gradually move away from extreme easing, compared to the pace of rising yields on dollar assets, the rhythm of Japan's policy normalization is still moderate.
From market pricing, overnight index swaps show an about 80% probability that the BOJ will act again by year-end. Survey results also show that most economists expect the BOJ to further raise the benchmark rate before the December meeting. In other words, although Japan has entered a rate hike cycle, whether its policy strength is sufficient to stabilize the exchange rate and curb inflation remains to be verified over time.
South Korea Stock Market Hits New High, SK Hynix Becomes Focus
Compared to the Japanese market, the strength of the South Korean stock market more directly reflects the heat of AI semiconductor demand. The KOSPI hit a record high during the session, with SK Hynix becoming one of the most watched core stocks. The company's stock price rose over 4% at one point; the latest news shows that the company has delivered 12-layer next-generation HBM4E chip samples to core customers. This progress is seen by the market as an important sign that it continues to maintain its lead in the AI memory race.
HBM, or High-Bandwidth Memory, is a key component for AI training and inference systems. As large model parameter scales expand and computing demand continues to rise, memory has been upgraded from a "supporting device" to critical infrastructure determining AI system performance. Whoever can first establish advantages in HBM product performance, power consumption, and mass production stability will likely hold stronger bargaining power in the future AI hardware ecosystem.
SK Hynix's release of the 12-layer HBM4E sample means the company has taken another step in the next-generation AI memory race. The company said the 12-layer HBM4E has improvements in single-pin data processing speed, power efficiency, and thermal management, better supporting AI training and inference tasks. Especially in high-performance computing environments, improvements in thermal resistance and stability will directly affect deployment efficiency and long-term operational reliability of large-scale data centers.
HBM Competition Intensifies, Storage Chip Chain Faces Revaluation
Currently, HBM has become one of the most strategically valuable sub-sectors in the global storage industry. Unlike traditional storage, HBM emphasizes high bandwidth, low latency, and high energy efficiency, directly serving GPUs, AI accelerators, and large data center servers. As AI applications deepen, market demand for HBM is not just "growing," but may enter a structural expansion cycle lasting several years.
SK Hynix emphasized that its HBM4E product adopts advanced MR-MUF technology, achieving 48GB capacity in a 12-layer stack while balancing structural stability and heat dissipation. These technical details are highly valued by capital markets because HBM is not simply about competing on capacity, but a system-level competition integrating materials, packaging, thermal management, and yield control. Companies with first-mover advantages can often lock in top clients earlier and build technical barriers through continuous iteration.
It is worth mentioning that SK Hynix's client list includes AMD, Nvidia, and Google, meaning its product iteration not only affects single company revenue but also directly impacts the hardware configuration of the global AI computing ecosystem. A month ago, Samsung Electronics began shipping HBM4E samples; the competition among global leading storage manufacturers on next-generation products is now fully underway. Who can mass-produce first, who can improve yield faster, who can dominate in energy efficiency ratio will determine the new ranking in the storage industry.
US Chip Segment Also Rises, Global Tech Cycle Resonates
The positive reaction in Asian markets quickly transmitted to US tech stock futures and overnight trading. Nasdaq futures expanded gains to 1.4%, with chip stocks like Nvidia, ARM, Micron, Intel, and Broadcom generally rising, showing global investors are re-adding tech growth assets.
This phenomenon indicates that the market's logic for the AI supply chain has gradually shifted from "theme-driven" to "performance delivery-driven." Nvidia remains the core beneficiary of the computing wave, while companies like Micron, Intel, and Broadcom play key roles in storage, computing, and network connectivity. As HBM demand rises, the entire chip supply chain is expected to continue seeing both price and valuation recovery.
From an investment perspective, AI infrastructure construction is still in the early to middle stage. Whether for large model iteration on the training side or commercial landing on the inference side, continuous expansion of computing and storage configurations is needed. Therefore, areas like memory chips, advanced packaging, server components, and high-performance interconnection are expected to remain important focal points for capital markets in the coming period.
Conclusion: Risk Easing and Industry Upgrade Resonate, Market Focus Continues to Tilt Toward Tech
Overall, this round of Japan and South Korea stock market hitting new highs is both a result of improved risk appetite from periodic easing of geopolitical tensions and a fundamental revaluation driven by continuous expansion of the AI industry. The Japanese market benefits from the resonance of the export chain, manufacturing, and tech sectors, while the South Korean market stands out due to technological breakthroughs by storage chip leaders. At the same time, factors like yen depreciation, BOJ policy path, and Fed hawkish expectations add more variables to the market.
Looking ahead, if US-Iran relations continue to ease and AI demand remains strong, global funds will likely continue to favor tech and semiconductor assets. Especially in high-barrier tracks like HBM, technology iteration and mass production progress may continue to be important catalysts for stock price volatility. For investors, understanding the linkage between macro risk changes and industry trends will be key to capturing future market opportunities.
