SK Hynix Loses $89B in Market Cap in a Single Day; A-Share Memory Stocks Hit Limit Down While Domestic GPU Hits Record High
Claire Weston
SK Hynix's Korean-listed shares plunged 15.4% — erasing over $89 billion in market cap — and A-share memory chips hit limit-down across the board, yet domestic GPU leader Moore Threads (沐曦股份) surged past 13% intraday. Two opposite moves on the same day signal the market is repricing supply structure, not demand logic.
Why did SK Hynix lose $89 billion in one day?
SK Hynix's Korean shares fell 15.4%, the steepest single-day drop in its history. Samsung Electronics slid nearly 11%; the KOSPI closed down 8.9%, triggering its seventh circuit breaker of the year.
This means → the sell-off hit the entire Korean semiconductor complex, not just one stock.
According to HuaBao Fund, the direct catalyst was SK Hynix's US listing: institutions shifted holdings from Korean shares to American depositary receipts, creating a one-way rebalance — sell Korea, buy the US.
Photon Capital attributed the move to three supply-side forces: profit-taking after the US debut's nearly 13% first-day pop, dilution from a $26.5 billion new-share offering, and a repricing gap between the Korean and US listings.
What role did Korea's credit squeeze play?
Korean media reported that the country's five major commercial banks consumed over 85% of their full-year household-loan quotas in the first half; two banks exceeded regulatory ceilings, leaving almost no room for new credit in the second half.
In plain terms = Korean retail investors' borrowing power has shrunk sharply — even those wanting to "buy the dip" have no ammunition.
A brokerage's overseas research team found that deployable retail capital across the Korean market has fallen roughly 20%, with bank-to-brokerage fund flows stalling completely.
This reflects a deeper dynamic: the sell-off was amplified not just by position-switching but by a liquidity drought.
Has AI memory demand actually weakened?
Analysts broadly agree: the demand thesis is intact. The crash was not driven by softer AI memory demand.
Photon Capital stated explicitly: "Structural AI memory demand continues to exceed supply. The broader trend of rising memory prices, growing demand, and tight supply did not disappear overnight."
SK Hynix CEO Kwak Noh-jung said on the Nasdaq debut day that the global memory industry is heading toward the most severe supply shortage in its history, peaking in 2027 and potentially lasting beyond 2030. Micron CEO Sanjay Mehrotra previously gave a consistent assessment.
Korea Investment & Securities forecast SK Hynix's Q2 operating profit could miss consensus by 8%, because a high share of HBM — high-bandwidth memory, ultra-fast memory designed specifically for AI chips — revenue constrains average selling-price upside. This means → it is an earnings-estimate revision, not a demand collapse.
A-share memory stocks hit limit-down — so why did domestic GPUs hit a record high?
A-share memory chips bore the brunt: Shannon Chip (香农芯创) hit 20 cm limit-down; GigaDevice (兆易创新) and Demingli (德明利) locked limit-down; Biwin Storage (佰维存储) and others fell over 10%.
Meanwhile, Moore Threads (沐曦股份) touched ¥1,033 intraday, closed up nearly 7%, and crossed ¥400 billion in market cap.
Two drivers underpinned its strength: a forthcoming debut of the "Xijing" S-series super-node product at the 2026 World AI Conference, and a mass-substitution window opened by booming inference-side demand and constrained overseas high-end chip supply.
Donghai Securities data show domestic AI accelerator market share rose from 30% in 2024 to 41% in 2025; China's AI accelerator chip market is projected to grow 59% YoY to ¥381.4 billion in 2026.
Why did bank stocks rally while tech sold off?
Bank of Suzhou rose 6.15%, leading city commercial banks higher. CCB gained 3.56%; BoCom and ICBC also advanced.
Wind data show 41 listed banks will pay aggregate dividends exceeding ¥645.6 billion for 2025 — a record — with nearly ¥345.9 billion in final dividends landing in recent weeks.
The CSI Dividend Low-Volatility Index carries a trailing 12-month yield of 5.2%, while its turnover accounts for just 1.23% of total A-share volume — a far healthier trading structure than tech.
This means → as tech whipsawed, capital rotated toward high-dividend, low-volatility defensive assets. HuaTai-PineBridge data show market-wide dividend ETFs attracted net inflows of ¥9.8 billion in May and ¥9.2 billion in June.
What comes next?
Korea's Financial Supervisory Service (FSS) has ordered asset managers to submit volatility-suppression and remediation plans for single-stock leveraged ETFs. A senior coordination mechanism comprising the Ministry of Economy and Finance, the Financial Services Commission, the Bank of Korea, and the FSS has stepped in.
FSS Governor Lee Chan-jin publicly said he "regrets not doing everything possible to block" the product's launch. In plain terms = the regulator has acknowledged its mistake; further restrictions on leveraged ETFs are all but certain.
Golden Eagle Fund argues the tech pullback is a trading-level cool-down, not a reversal of the industry thesis: "AI compute demand is still growing; domestic compute, memory, and semiconductor equipment and materials remain on an upgrade and import-substitution trajectory."
This reflects the key verification point ahead: whether the supply-side disruption can be digested, or whether it will transmit further into the demand side.
Content is for reference only, not financial advice.