Recently, significant gains in memory-related stocks have provided a substantial boost to both U.S. and South Korean equity markets. However, financial analysts caution that overlooking the cyclical nature of this market could be risky for investors. The memory sector has experienced a sustained upswing since the launch of ChatGPT in December 2022, which ignited a surge in demand for high-bandwidth memory (HBM). Major players in the market, such as Samsung and SK Hynix, have seen their stock prices climb by 114% and 186% year-to-date, respectively. Additionally, U.S. firms Micron Technology and SanDisk have also reported impressive advances of 141% and 156% in 2026.
The optimism surrounding the memory stock boom is predicated on the idea that the industry has moved past its historical cycles of volatility—characterized by fluctuating demand and constant supply. Industry leaders argue that advancements in AI technology have altered this past pattern of boom and bust, and there exists a structural supply shortage that could keep prices elevated for an extended period.
William de Gale, a portfolio manager at BlueBox Asset Management, expressed skepticism about the long-term viability of the memory sector. He noted that the industry has a history of extreme fluctuations and criticized the notion that the cyclical nature of memory demand has been eliminated, suggesting that such thinking often precedes market downturns.
On the innovation front, memory chip supply is currently tight, yet Alphabet's Google recently introduced TurboQuant, a novel compression technology. This innovation could potentially decrease the memory requirements for operating large language models by a factor of six, aiming to enhance AI model efficiency. This new development is significant, as it may lower the demand for memory chips crucial for training expansive AI models created by companies like Google, OpenAI, and Anthropic. Following the announcement of TurboQuant, Deutsche Bank indicated that investors should remain prepared for ongoing disruptions related to AI technology, which may lead to a decline in the stock prices of major memory chip suppliers. However, analysts caution that it remains uncertain whether TurboQuant will fundamentally alter demand patterns.
Jon Cunliffe, head of an investment office at JM Finn, shared insights on the potential for production increases in the next few years, which may alleviate current supply constraints—especially if AI demand stabilizes. He noted that stock prices today reflect expectations of sustained high prices and disciplined investment strategies among companies, coupled with improved profit margins. Cunliffe also highlighted recent momentum crowding in the sector, which could make it susceptible to volatility.
Andrew Lapping, the chief investment officer at Ranmore Fund Management, pointed out that predicting when supply may outstrip demand in the memory sector is challenging. He advised caution for investors looking into an industry that has historically low returns on capital but is currently priced for high future returns. Lapping remarked, "A leopard does not often change its spots," hinting at the unlikely nature of a significant shift in memory market dynamics.
In South Korea, Samsung and SK Hynix have propelled the Kospi index to remarkable heights in 2025 and 2026, as these companies account for over 50% of the index's value. Steve Brice, global CIO at Standard Chartered, indicated on CNBC's Squawk Box Asia that he anticipates peak optimism for Korean equities is on the horizon. He even advised clients to consider taking profits and diversifying their portfolios. Despite this cautious approach, some financial institutions remain optimistic about the future of these firms, with Nomura projecting that SK Hynix shares could reach 4 million won and Samsung Electronics could escalate to 590,000 won within a year, suggesting a 20% increase for Samsung and potentially doubling SK Hynix’s current share price.
