Samsung, SK hynix suffer worst weekly stock rout since 2008

Samsung Electronics and SK hynix suffered exceptionally sharp weekly share-price declines. Samsung fell 17.8%, from 262,000 won to 215,500 won. SK hynix dropped 24.3%, from 1.681 million won to 1.272 million won. The declines showed how quickly investor confidence weakened across South Korea’s major memory-chip companies.

Samsung’s fall was its steepest weekly decline since the fourth week of October 2008. It then lost 19.3% during the global financial crisis. SK hynix’s decline was its worst since the third week of November 2008, when it plunged 31.9%. Thus, both companies approached, but did not exceed, their worst reported weekly falls from 2008.

The comparison highlights the seriousness of the latest selloff. However, the article links it to current concerns rather than a repeat of the 2008 crisis. Investors were worried about US interest rates, the value of massive AI investments, stronger Chinese competition, and additional uncertainty around SK hynix’s Solidigm subsidiary.

Foreign investors sell shares when overseas funds, institutions, or individuals reduce their ownership of a company. Their trades are part of the market’s normal buying and selling, but their impact can be large when many investors act together. The article describes foreign investors as the main force behind the chip-stock selloff.

Selling puts pressure on a stock because every completed sale needs a buyer. If sellers greatly outnumber buyers at the current price, they may accept lower prices to complete their trades. Those falling prices can also influence other investors, creating further selling and faster declines. This is a market mechanism, not proof that a company’s business has suddenly collapsed.

In this case, foreign investors sold 11.21 trillion won of Kospi-listed stocks in one week. Samsung Electronics accounted for 3.47 trillion won and SK hynix for 5.35 trillion won. Their concentrated selling helped drive both shares to their steepest weekly falls since 2008.

The selloff was broad but heavily concentrated in South Korea’s two biggest chipmakers. Foreign investors sold a net 11.21 trillion won worth of Kospi-listed stocks from Monday through Friday. Samsung Electronics represented 3.47 trillion won of those sales, while SK hynix represented 5.35 trillion won. Together, the companies accounted for 78.8% of total net foreign selling.

The selling also reduced the proportion of each company held by foreign investors. Foreign ownership of Samsung Electronics fell to 45.98% by Friday. At SK hynix, it declined to 48.85%. These figures describe the ownership levels after the week’s selling, not the exact percentage-point drop from the previous week.

Samsung’s foreign ownership reached its lowest level since July 2009. SK hynix’s reached its lowest since December 2021. The scale and concentration of the trades show that overseas investors were responding strongly to risks affecting the chip sector and the wider market.

Investors look beyond a company’s latest earnings when pricing shares. Strong results can matter less if markets expect future profits, growth, or competitive strength to weaken. That happened here. The article says both Samsung Electronics and SK hynix had strong earnings, but investors focused on mounting external risks instead.

One concern was uncertainty over US interest rates, which contributed to an unfavorable macroeconomic environment. Investors also questioned whether enormous AI investments would produce adequate returns. At the same time, Chinese memory-chipmakers were becoming more ambitious. These issues could affect expected demand, profit margins, and the prices investors are willing to pay for chip shares.

The reaction shows that stock valuations reflect expectations, not only reported results. SK hynix faced another specific concern over a possible US listing of its NAND subsidiary, Solidigm. Analysts said market volatility could persist, and that the concerns were unlikely to ease in the short term.

ChangXin Memory Technologies, or CXMT, is identified in the article as China’s largest DRAM maker. It recently announced plans to introduce next-generation server memory by the end of 2026. The planned products would use a denser 4F-squared cell architecture, signaling that CXMT wants to compete in advanced memory rather than only lower-end segments.

The challenge comes from technology and market expectations. Denser memory architecture could allow more memory capacity in a given design. If CXMT can manufacture such products economically and at scale, customers could gain another supplier and Korean chipmakers could face stronger competition. That possibility can reduce confidence in Samsung and SK hynix’s future market position.

CXMT has not yet demonstrated economical mass production of the technology. It has also not disclosed detailed product specifications or manufacturing yields. Therefore, the announcement raises long-term questions, but it does not yet prove that CXMT can match the Korean companies commercially.

Stronger Chinese competition could pressure Samsung and SK hynix by threatening their position in advanced memory. If Chinese products become capable and economical, buyers may have more supplier choices. That could weigh on Korean companies’ market share, pricing power, or expected future earnings. The article says CXMT’s plans already raised questions about their long-term competitive position.

Uncertainty about US interest rates can make the broader economic environment less favorable and increase market volatility. Doubts about AI investment returns create a different concern: huge spending on AI systems may not generate profits quickly enough. If investors lower their expectations for future chip demand or earnings, they may sell shares even when current results are strong.

Together, these pressures could reduce stock valuations and keep prices unstable. The article does not quantify future losses or valuation changes. It reports that analyst Park Jae-hwan expected concerns to persist in the short term amid an unfavorable macroeconomic environment.

DRAM is a fast, temporary memory used while a device or server is actively working. It holds data and instructions that processors need quickly, but its contents disappear when power is removed. NAND is nonvolatile flash memory. It keeps data without power and is widely used for storage, including in solid-state drives and smartphones. These definitions use established technology knowledge beyond the article.

Servers and computers use DRAM for active programs and calculations, while NAND stores operating systems, applications, and files. Smartphones need both types for responsive operation and long-term storage. AI systems also depend on memory: they must hold large amounts of data and model information while processing demanding workloads. Memory performance and capacity can affect how efficiently these systems operate.

The article focuses on Samsung Electronics and SK hynix as major memory-chip companies. It specifically discusses DRAM competition from CXMT and uncertainty over SK hynix’s NAND subsidiary, Solidigm. That connection makes memory central to the companies’ earnings, competitive position, and stock valuations.