Shares of South Korean chipmakers surged on Thursday, June 24, as Micron’s quarterly earnings beat all major financial metrics and sent AI memory demand expectations materially higher. SK Hynix rose as much as 12% in early trade, closing up 9.21%. Samsung Electronics gained 2.68%. The Kospi benchmark rose 4.8%. The rally follows SK Hynix’s landmark session on Monday, June 22, when it became South Korea’s most valuable publicly listed company for the first time, surpassing Samsung Electronics with a market capitalisation of approximately $1.35 trillion after a 5.6% daily gain – ending Samsung’s 26-year hold on the top spot. SK Hynix’s stock is up more than fourfold year-to-date, while Samsung has roughly tripled. The two chipmakers together account for more than 40% of the Kospi index. YourNewsClub views the SK Hynix surpassing Samsung event as more structurally significant than its 5.6% daily move – the first time a non-Samsung company has led South Korea’s market since 2000 marks a fundamental revaluation of what the Korean economy’s most important asset is.
The HBM story is the whole story. High-bandwidth memory, or HBM, is the specialised chip architecture that AI training and inference hardware requires to move data fast enough to avoid bottlenecking the GPU. SK Hynix built its dominant position in HBM over years when memory prices were depressed and Samsung invested elsewhere. As Nvidia’s H200, B200, and now Rubin GPU architectures have driven HBM into structural shortage conditions, SK Hynix’s strategic patience during the downturn has translated into a market positioning that competitors including Samsung and Micron have been attempting to close. SK Hynix reported a record operating profit of 23.5 trillion won in 2024. That is the direct commercial consequence of investing in HBM capacity during the 2023 memory downturn, when the company posted an operating loss of 7.73 trillion won, rather than cutting investment to preserve short-term margins.
South Korea’s government is now running to keep pace with the commercial momentum. A presidential policy adviser confirmed that the government is in active discussions with both Samsung and SK Hynix over a major new semiconductor cluster, with a formal announcement expected soon. Presidential adviser Kim Yong-beom described AI chip demand as “exponential and explosive” and said the cluster’s completion timeline could be compressed by more than a decade to a revised target of 2034 to 2035. SK Hynix separately plans to raise more than $29 billion through a Nasdaq listing, potentially as soon as July 10. Analyst Douglas Kim of Douglas Research Advisory described the likely effect: the ADR listing could narrow the valuation discount SK Hynix has long carried in the Korean domestic market. YourNewsClub signals the Nasdaq listing, if it proceeds in July, as the most consequential single capital markets event for the Korean semiconductor sector since Samsung’s ADR programme launched in the late 1990s.
Maya Renn, whose work focuses on the ethics of computation and access to power through technology, frames what the concentration means for the Kospi: “When two companies account for more than 40% of a national stock index, and both companies’ revenues depend on a single technology cycle – AI HBM demand – the index has effectively become a sector ETF with national branding. That concentration heightens every systemic risk, including supply chain disruption, customer concentration in Nvidia, and a slowdown in AI infrastructure investment.” Alex Reinhardt, who tracks financial systems and settlement infrastructure through digital protocols, draws the capital inflow dynamic: “Micron’s earnings beat functions as a sector repricing event for all HBM suppliers. Every institutional investor running a semiconductor overweight sees SK Hynix and Samsung as the highest-beta expression of that thesis in a market that has already priced in significant AI optimism. The Thursday rally is rational given the Micron signal.” YourNewsClub tracks the SK Hynix Nasdaq ADR filing as the next discrete event that changes the investment structure for global AI semiconductor exposure.
Your News Club counts the July 10 listing target as the timeline against which all the current price momentum is running – and the Samsung buyback announcement, which Yonhap reported at approximately 90 trillion won but has not yet been confirmed in size or timing, as the secondary capital event that could drive a second leg of the rally independently of the ADR.