SK Hynix Crashes 14%, Samsung Down 12%: The Semiconductor Selloff Shaking Asia

It has been a brutal session for Asia's semiconductor stocks. SK Hynix, the world's second-largest memory chipmaker and Nvidia's primary supplier of high-bandwidth memory, plunged as much as 14% on Monday. Samsung Electronics — the largest — fell over 12%. SoftBank Group, Japan's AI proxy through its dominant stake in Arm Holdings, slid 6.3%. Tokyo Electron dropped nearly 11%. Advantest, which makes chip-testing equipment, shed more than 10%.

The South Korean benchmark KOSPI index, where Samsung and SK Hynix together account for nearly half the weighting, fell approximately 9.4%. It was one of the worst single-day declines for Asian chip stocks in recent memory, and it extended a selloff that had already been building across Wall Street. SK Hynix's U.S.-listed shares, which only recently debuted at $149 per share in a high-profile IPO, closed at $143.02 — below their IPO price for the first time.

What Is Driving the Selloff?

This is not a single-cause event. The semiconductor selloff of July 28 is the product of at least three distinct pressures arriving simultaneously — and the market is repricing risk across the entire chain in response.

1. China's DUV lithography breakthrough. Just one day before this session, The Information reported that a Shanghai state-backed company had successfully begun mass-producing homegrown immersion DUV lithography machines — the first time China has achieved production-scale domestic lithography. We covered this development in detail yesterday (see: China Cracks DUV Lithography). That news dragged ASML, Applied Materials, Lam Research, and KLA Corp lower. Today, the contagion has spread to memory makers and the broader Asia chip ecosystem.

2. AI financing and valuation concerns. The AI infrastructure build-out that has powered semiconductor stocks for the past two years requires enormous capital. Reports of hedge-fund stress and growing investor anxiety about whether hyperscaler capex can sustain current chip valuations have been circulating for weeks. SK Hynix, as Nvidia's exclusive HBM supplier, is directly in the crosshairs of any AI spending slowdown narrative. The stock had rallied extraordinary percentages from its lows — that kind of run makes it the first thing institutional investors sell when risk appetite deteriorates.

3. Chinese AI competition. Reports emerged that DeepSeek, China's leading AI lab, is developing its own proprietary chip design that could reduce its dependence on Nvidia hardware. If DeepSeek — and by extension other Chinese AI developers — can run large models on domestic chips, it removes one of the key incremental demand drivers for HBM memory. Samsung SDI, LG Innotek, and LG Chem — all suppliers to the AI and EV ecosystems — also fell sharply, underscoring how broad the contagion has become.

The Full Damage — Asia Chip Stocks on July 28

Why SK Hynix Is the Most Exposed Name

Of all the companies caught in this selloff, SK Hynix deserves the closest attention because of its unique position in the AI supply chain. The company currently supplies virtually all of Nvidia's HBM3E memory — the high-bandwidth memory stacked inside every H100 and B200 GPU that powers the global AI build-out. This dominance has been the stock's superpower during the AI boom. It is also its greatest vulnerability when that narrative wobbles.

SK Hynix generates approximately 65% of its revenue from U.S. hyperscaler customers — primarily through Nvidia. That concentration is extraordinary. When investors start to question whether AI capex is peaking, or whether Chinese AI development could reduce the addressable market for HBM, SK Hynix is the first stock they exit. The 14% single-session decline is an expression of that concentrated exposure being rapidly repriced.

The U.S.-listed share price falling below the IPO level adds another layer of pressure. Recent IPO buyers — often retail investors who bought at or above $149 — are now underwater. That group tends to sell quickly when losses mount, creating additional supply pressure in the near term.

The Samsung Angle: Different Risk, Same Selloff

Samsung's 12% fall is significant for a different reason. Unlike SK Hynix, Samsung's exposure to the AI trade is more balanced — it makes DRAM, NAND flash, logic chips under contract, and consumer electronics. Samsung has actually been losing HBM market share to SK Hynix over the past year, meaning it is less directly exposed to the Nvidia relationship.

The selloff in Samsung is therefore more of an index-driven, sentiment-driven move than a fundamental reassessment. Because Samsung accounts for roughly 25% of the KOSPI index, foreign investors selling Korea broadly — as a proxy for risk-off on Asian tech — sell Samsung first and ask questions later. This is the mechanical side of index concentration: when the market panics, the large-cap index heavyweights get hit hardest regardless of their specific fundamentals.

SoftBank and the Japan Angle

SoftBank's 6.3% decline reflects its role as the most direct AI proxy in Japan. Through its ownership of Arm Holdings — the chip architecture company whose designs power virtually every smartphone processor and an increasing share of data centre chips — SoftBank has become a high-beta expression of AI optimism. When AI sentiment deteriorates, SoftBank sells off disproportionately. Tokyo Electron and Advantest, which supply semiconductor manufacturing and testing equipment respectively, are being hit by the same ASML contagion that affected U.S. equipment stocks yesterday.

Bull and Bear Case from Here

What Investors Should Watch Next

The most important data point to watch in the near term is Nvidia's earnings — due in late August — and specifically any commentary on HBM orders and Blackwell production ramp. If Nvidia reaffirms its supply commitments from SK Hynix and flags no slowdown in hyperscaler demand, this selloff will look like an overreaction and both SK Hynix and Samsung will recover sharply. If Nvidia signals any caution, the selloff will deepen.

The second thing to watch is whether the Chinese DUV story develops further detail. A mass-production capability for mature-node chips (28nm and above) in China is a real structural shift, but it does not immediately threaten HBM production — HBM is made at advanced DRAM nodes that require leading-edge lithography far beyond what China has demonstrated. The overlap between China's DUV achievement and the addressable market for SK Hynix and Samsung HBM is limited in the near term.

The third factor is the broader U.S. market and risk appetite. Semiconductor stocks globally trade as high-beta expressions of AI optimism. If U.S. markets stabilise and tech sentiment recovers, Asia semis will follow. If Wall Street continues to sell AI names, today's Asian session is just the beginning of a larger unwind.

Our base case: the fundamental AI demand story — record hyperscaler capex, Nvidia Blackwell ramp, HBM shortage continuing through 2026 — remains intact. The selloff is driven more by sentiment, positioning, and China-related narrative risk than by any actual deterioration in orders. For investors with a 12–18 month horizon, days like today are the days that create the best entry points in the best businesses.