SK hynix is earning more than ever, shipping next-generation AI memory and returning an unprecedented amount of capital to shareholders. Its stock, however, is heading in the opposite direction.
Shares traded in South Korea under ticker 000660 stood near KRW 1.25 million on October 19, 2026 — approximately 58% below the 52-week high of KRW 2.99 million, and roughly one-third lower since the start of October.
The decline doesn’t mean demand for AI memory has disappeared. It means the market has moved past the question of whether AI needs more memory. Investors are now asking whether SK hynix can defend its unusually high prices, margins and market position once competitors add capacity.
That question will dominate the company’s next earnings report.
Why Is SK Hynix Stock Falling?
SK hynix shares rose rapidly as spending on AI data centers created a shortage of high-bandwidth memory, or HBM. The company became a central supplier to the AI hardware industry, benefiting from demand for products used alongside advanced processors from NVIDIA and other chip designers.
The rally eventually pushed expectations to an extreme level. Once investors began anticipating record earnings before they were reported, merely delivering strong numbers was no longer enough. The company had to keep beating increasingly ambitious forecasts while convincing the market that current profit margins were sustainable.
That is a difficult standard for any semiconductor manufacturer. Memory remains a cyclical industry, and higher prices eventually encourage manufacturers to build more capacity. Investors are therefore looking beyond the present shortage and attempting to price the market that could exist in 2027 and 2028.
The recent decline has also occurred alongside broader volatility in semiconductor stocks. Higher interest rates, concerns about AI infrastructure spending and profit-taking in previous market leaders have made investors less willing to pay for growth that may already be reflected in the share price.
As of October 19, SK hynix shares were trading around KRW 1.25 million, compared with a 52-week high of KRW 2.99 million.
The Business Has Not Collapsed
The contrast between the stock and the company’s results is striking.
SK hynix reported second-quarter revenue of KRW 79.32 trillion and operating profit of KRW 60.54 trillion. Revenue increased 257% from the previous year, while operating profit rose 557%. The company attributed the performance to rising memory prices and stronger sales of HBM, AI-server DRAM and enterprise solid-state drives.
HBM4 also entered commercial shipments during the quarter. According to the company, the product met customer requirements for operating speed, power efficiency and cost competitiveness. SK hynix had also completed long-term supply agreements with approximately 10 key customers, giving it more visibility than memory manufacturers usually enjoy during a cyclical expansion.
These results confirm that SK hynix remains one of the clearest corporate beneficiaries of AI infrastructure spending. They do not, however, guarantee that its current operating margin will last indefinitely.
The company is spending heavily to expand production, while Samsung Electronics and Micron are competing for a larger share of the HBM market. If supply grows more quickly than demand, customers could gain greater negotiating power and HBM pricing could weaken. That possibility explains why the stock can fall even while current earnings continue to rise.
A KRW 40 Trillion Buyback Was Not Enough
SK hynix has responded to the valuation decline with one of the largest shareholder-return programs ever announced by a Korean company.
In August, its board approved the repurchase and cancellation of KRW 40 trillion worth of common shares. Based on the share price used in the announcement, the program covered approximately 24.07 million shares, equal to around 3.3% of total shares outstanding.
Cancellation is important because the shares are not merely held in the company’s treasury. Once cancelled, they permanently reduce the number of shares among which future earnings are divided.
SK hynix also raised its shareholder-return target from within 50% to more than 50% of cumulative free cash flow generated between 2025 and 2027. Dividends, further repurchases and special distributions remain possible.
Yet the share price has fallen below the KRW 1.662 million reference price used when the buyback was announced. That tells investors something important: even an enormous repurchase cannot fully support a stock when the market is reducing its assumptions about future earnings.
The buyback strengthens earnings per share and signals that management considers the company undervalued. It cannot prevent a decline if investors expect memory prices or profit margins to normalize.
HBM4 Is Still the Center of the Investment Case
HBM solves one of the biggest problems in AI computing: processors can perform calculations faster than conventional memory can deliver data. By stacking DRAM vertically and placing it close to the processor, HBM provides substantially greater bandwidth.
The transition from HBM3E to HBM4 gives SK hynix another opportunity to defend its technological lead. HBM4 offers more input-output connections, higher data-transfer capacity and improved energy efficiency, all of which matter as AI models become larger and data centers face rising power constraints.
SK hynix recently displayed its HBM4 alongside a model of NVIDIA’s Vera Rubin platform at the 2026 OCP Global Summit. The presentation reinforced the commercial relationship between advanced AI processors and the memory required to operate them.
The investment risk is not that HBM suddenly becomes unnecessary. The real risk is that HBM becomes a larger but more competitive market. Samsung and Micron do not need to eliminate SK hynix’s lead to affect its economics. Additional qualified supply could narrow pricing premiums and make future customer contracts less profitable.
Investors should therefore pay attention to HBM4 shipment growth, production yields and contract pricing—not just announcements that a product has entered mass production.
SK Hynix Is Building Beyond HBM
The latest OCP presentation also showed that SK hynix does not want its AI strategy to depend on one product category.
The company introduced a second-generation 256GB CXL 3.2 memory module designed to let several servers access a shared pool of memory. It offers bandwidth of 80GB per second, more than double the previous generation, while improving energy efficiency by approximately 30%.
CXL pooling could help data centers avoid leaving expensive memory capacity unused inside individual servers. If adoption grows, SK hynix could sell not only the memory attached directly to AI accelerators but also the larger shared-memory systems surrounding them.
The company is pursuing a similar opportunity with high-bandwidth flash, or HBF. This technology applies vertical stacking techniques to NAND flash, combining greater capacity with faster data access. HBM is suited to workloads that prioritize speed, while HBF could support inference applications that need to store large volumes of data for many simultaneous users.
SK hynix also showcased server DRAM, SOCAMM2 modules and enterprise SSDs. Together, these products support a broader “memory-centric” strategy in which the company captures more value from each AI server or rack.
This is a credible direction, but investors should distinguish product demonstrations from revenue. CXL and HBF will become meaningful to the stock only when customers adopt them at scale.
Is SK Hynix Stock Undervalued?
A decline of nearly 60% from the 52-week high makes the stock look cheaper, but a lower price is not the same as a low-risk valuation.
The bullish case rests on SK hynix maintaining its HBM leadership, increasing HBM4 shipments and expanding into CXL memory, HBF and enterprise storage. Long-term customer agreements and the cancellation of repurchased shares add support to that case.
The bearish case is that the market is already near peak memory profitability. Competition could reduce HBM pricing power, large investments could weaken free cash flow, and a slowdown in AI capital expenditure could arrive just as new capacity enters production.
The stock’s next sustained move will probably depend less on another AI product announcement and more on whether management can demonstrate that current earnings are structural rather than cyclical.
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Frequently Asked Questions
What is the SK hynix stock symbol in South Korea?
SK hynix trades on the Korea Exchange under ticker 000660. Its Korean-listed shares are priced in South Korean won and trade during Korean market hours.
Why has SK hynix stock fallen despite record earnings?
The market is looking beyond current profits. Investors are concerned that new memory capacity, greater competition and potentially weaker pricing could reduce earnings after the present AI-driven shortage eases. The earlier rally also left little room for results that merely met elevated expectations.
How much has SK hynix stock fallen?
At approximately KRW 1.25 million on October 19, 2026, the stock was around 58% below its 52-week high of KRW 2.99 million. Prices can change quickly, so readers should check a live market source before making decisions.
