SK Hynix and the AI Memory Supercycle: Record Profits, a Falling Share Price, and a Japanese Gamble

There is a particular kind of contradiction that emerges when a company delivers its best-ever financial results and its stock falls anyway. SK Hynix is living in that contradiction now. In the second quarter of 2026, the South Korean memory giant reported revenue of 79.32 trillion won, operating profit of 60.54 trillion won, and net profit of 93.92 trillion won. Operating margin reached 76 percent, and net margin exceeded 118 percent. Those are not the numbers of a company in trouble. They are the numbers of a company that has become indispensable to the artificial intelligence buildout.

Yet the share price has retreated. The stock trades near 1,857,000 won on the Korean exchange, well below its recent peak of 2,987,000 won. The decline reflects a broader reassessment of the memory sector as investors weigh the durability of the current pricing environment against the possibility of new supply coming online. Samsung Electronics and SK Hynix together have seen more than 20 percent of their combined market value erased from peak levels. The market is not questioning whether the AI memory boom is real. It is questioning how long it can last.

The bull case rests on a simple fact: the world does not have enough memory. Inventories at Samsung and SK Hynix have fallen below ten days of supply, a level that a KB Securities analyst described as evidence not merely of demand recovery but of a fundamental shortage of physical supply. The shortage is most acute in high-bandwidth memory, the specialized stacked memory that AI accelerators require. SK Hynix has won approximately 70 percent of Nvidia's HBM4 orders for the Vera Rubin platform, up from earlier estimates of around 50 percent. Counterpoint Research estimates the company will account for 54 percent of the global HBM4 market in 2026. That concentration of supply in a single vendor is a source of pricing power for SK Hynix, but it is also a risk for Nvidia, which is why the chipmaker has signed a multiyear agreement with SK Hynix to co-develop future memory generations and has been working to qualify Samsung and Micron as additional suppliers.

The capital return story adds another layer. In August, SK Hynix's board approved a plan to repurchase and cancel 40 trillion won worth of shares, and the company raised its shareholder return target to more than 50 percent of cumulative free cash flow for the 2025–2027 period. Citigroup has noted that shareholder returns in 2026 could exceed 100 trillion won, and it maintains a highly confident outperform rating with a target price of 3.7 million won. Mirae Asset Securities raised its target to 3.1 million won, while Daishin Securities has a target of 3.9 million won, citing what it calls "super momentum" from the ADR listing and HBM demand.

The company is also expanding its geographic footprint in a way that would have been unthinkable a decade ago. SK Hynix is considering building a memory chip fabrication plant in Miyagi Prefecture, Japan, with an investment that could reach tens of trillions of won. It would be the first Korean memory maker to make a major manufacturing investment in Japan. Miyagi has offered a 300,000-square-meter site along with power and water infrastructure to attract the facility. The logic is straightforward: Japan has a mature ecosystem of semiconductor materials, components, and equipment, and Tokyo has been actively courting foreign chip investment. For SK Hynix, which is already building a four-billion-dollar HBM packaging plant in the United States, the Japanese facility would extend its global production base and reduce its reliance on Korean sites.

What should a careful observer watch from here? First, the trajectory of HBM4 pricing and volume. The transition from HBM3E to HBM4 is the single most important variable for SK Hynix's margins over the next four quarters. Second, the final decision on the Japanese plant. A confirmed investment would signal that the company expects the supply shortage to persist well into the next decade. Third, the share price relative to the fundamental results. The gap between record profits and a falling stock is not unusual in cyclical industries, but it is a signal that the market is looking past the current quarter toward the next turn of the cycle. The memory business has always been a boom-and-bust industry. The question now is whether AI has changed that pattern permanently, or merely delayed the next bust.

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