On June 22, 2026, a definitive shift occurred in the South Korean capital market as SK hynix surpassed Samsung Electronics to become the nation's most valuable public company for the first time since 1999. During trading hours, SK hynix's market capitalization peaked at 208 trillion KRW, approximately $1.35 trillion, narrowly edging out Samsung Electronics, which stood at 206.6 trillion KRW. This event marked the end of a 27-year reign for Samsung as the undisputed leader of the Korean stock market, signaling a profound realignment of corporate power driven by the artificial intelligence revolution. The trajectory of SK hynix, once burdened with $14 billion in debt and facing potential bankruptcy, represents one of the most dramatic turnarounds in modern business history, transforming a distressed entity into a trillion-dollar empire within two decades.

The catalyst for this historic crossover was a strategic pivot toward High Bandwidth Memory (HBM), a component that has evolved from a niche memory category into the critical infrastructure for AI computing. As large language models demand unprecedented data throughput, the specifications for HBM have escalated rapidly; an NVIDIA H100 GPU requires 80GB of HBM, the H200 requires 141GB, and the latest B200 demands 192GB. In this high-stakes race, only three manufacturers globally possess the capability to produce HBM: SK hynix, Samsung, and Micron. Data compiled by Woofun AI shows that SK hynix has secured a dominant 59% share of the global HBM market in 2025, establishing a near-monopolistic position that rivals have struggled to breach. This leadership is particularly pronounced in the high-margin HBM4 sector, where Counterpoint Research forecasts SK hynix will capture 54% of the market in 2026, having already secured over two-thirds of the orders for NVIDIA's next-generation Vera Rubin platform.

Financial metrics underscore the magnitude of this strategic success. In the first quarter of 2026, SK hynix reported consolidated revenue of 52.58 trillion Korean won, representing a staggering year-on-year increase of 198.1% and crossing the 50 trillion won threshold for the first time. Net profit for the period reached 40.35 trillion Korean won, nearly quadrupling compared to the previous year. This performance translates to an average daily net profit exceeding 2 billion RMB during the first three months of 2026. The profitability of the HBM division is exceptional, with operating profit margins ranging from 75% to 83%, significantly outpacing the traditional DRAM business by approximately 10 percentage points. Consequently, HBM now accounts for roughly 40% of total revenue, serving as the primary profit engine and driving an overall operating profit margin of 72%, a figure that even exceeds that of NVIDIA.

In stark contrast, Samsung Electronics faces structural challenges exacerbated by its diversified business model. While Samsung generated 333.6 trillion Korean won in revenue in 2025, far surpassing SK hynix, its broad portfolio spanning smartphones, home appliances, and foundry services has diluted strategic focus and resources. In the critical memory sector, Samsung lags behind in HBM3E and HBM4 customer certification and mass production, missing out on the premium pricing available during the peak of AI demand. Woofun AI notes that this technological gap has been compounded by synchronous struggles in other divisions; the smartphone business saw its market share decline from 54% to 45%, while the foundry business suffers from underutilization due to an inability to secure high-end orders. These headwinds have eroded the memory division's potential profits, further complicated by escalating labor disputes that threaten organizational cohesion while SK hynix employees benefit from record bonuses.

The rise of SK hynix also reflects a broader historical narrative of the South Korean semiconductor industry. Originating from Hyundai Electronics in 1983, the company grew into a major DRAM player before facing a near-collapse in the early 2000s due to a semiconductor winter and massive debt. Government-led consolidation and counter-cyclical investments eventually stabilized the firm, but the true turning point was the early identification of HBM as a future growth vector. This foresight allowed SK hynix to capitalize on the transition of HBM from a specialized component to a foundational element for AI models like ChatGPT. The Financial Supervisory Service has since expressed regret over the proliferation of leveraged ETFs tied to these stocks, as retail investor demand has surged, prompting regulators to consider stabilization measures to mitigate systemic risk.

Looking ahead, the implications of this market cap reversal extend beyond corporate rankings to the national economic model. Lee Ju-yeol, Governor of the Bank of Korea, has highlighted that the semiconductor boom is driving a shift from traditional consumer electronics to an AI infrastructure-led growth strategy. Globally, this marks a transition from the commoditization of traditional DRAM and NAND to high-value specialization, where HBM commands long-term pricing power.

However, the path forward is not without risks. Woofun AI analysis suggests that by 2028, new capacity from Micron's New York fab, SK hynix's Cheongju campus, and Samsung's Pyeongtaek expansion could alter supply-demand dynamics. While TrendForce predicts memory price hikes will persist until the end of 2027, the eventual saturation of capacity may compress the scarcity premium. With Samsung retaining significant advantages in 3D NAND and advanced processes, the current 14 trillion KRW valuation gap remains precarious, ensuring that the competition for the throne will remain intense as the industry navigates the next phase of the AI cycle.