SK Hynix's Record 15.4% Drop: Is the AI Memory Trade Starting to Crack?
$SK hynix(SKHY)$ suffered its worst trading day since its 1996 listing on Monday, plunging 15.4% in its largest one-day decline on record. The broader KOSPI fell 8.95% and triggered a 20-minute trading halt, while Samsung Electronics dropped more than 10%.
The scale of the selloff cannot be explained by geopolitics alone. Higher oil prices provided the immediate shock, but the deeper pressure came from profit-taking after SK Hynix's Nasdaq debut, softer earnings upgrades and rising concerns over the sustainability of AI infrastructure financing.
Geopolitical Tensions and Oil Shock
Renewed US-Iran hostilities pushed Brent crude up more than 4%, reviving concerns over supply through the Strait of Hormuz, inflation and higher interest rates. Global technology stocks weakened, but Korea was hit particularly hard because of its dependence on imported energy and the KOSPI's heavy exposure to semiconductor stocks.
Still, geopolitics was the trigger rather than the full explanation. Before Monday, the KOSPI had already fallen more than 20% from its June 22 record, as doubts over AI earnings sustainability and leveraged investment products pressured chipmakers.
SK Hynix: HBM Is Diluting the Q2 ASP Upside
The more important marginal change is an earnings mix issue. Korea Investment & Securities forecasts Q2 revenue of KRW80.9 trillion and operating profit of KRW60.4 trillion, respectively 4.6% and 7.1% below consensus.
The report estimates that non-HBM DRAM ASP rose 34.2% quarter on quarter, while HBM ASP increased only 5.0%. HBM shipments also fell 18.2%, pushing HBM revenue down 14.1%. Because SK Hynix has a higher HBM mix than its peers, the slower repricing of HBM diluted total DRAM ASP growth to 28.9% and pulled the projected operating margin down to 74.7%, versus the 76.7% consensus.
This does not mean HBM has become structurally less profitable. The issue is timing: conventional DRAM prices surged in Q2, while HBM pricing lagged. Korea Investment expects HBM4 mass shipments to begin in Q3, with HBM ASP growth accelerating to 19.7% quarter on quarter in Q3 and 52.0% in Q4, which should lift blended ASP and restore earnings momentum.
The report also argues that three-to-five-year long-term agreements could extend the duration of high profitability. The near-term trade-off is slower quarterly HBM repricing, but potentially greater earnings visibility over the full cycle.
Leverage was another important amplifier. Retail investors' borrowed positions in KOSPI stocks stood at KRW29.7 trillion, just below the late-June record of KRW29.8 trillion, while new 2x single-stock ETFs linked to Samsung and SK Hynix made the market more vulnerable to accelerated deleveraging once prices reversed.
AI Credit Risk Is Starting to Reprice
The Goldman Sachs hyperscaler bond basket spread has widened from roughly 105 basis points to nearly 150 basis points, while the VIX remains close to 15.
That divergence suggests the stress is not yet a broad equity-market panic. Instead, credit investors are demanding more compensation for financing the companies behind the AI capital-expenditure boom.
For memory stocks, the transmission mechanism is straightforward:
Higher financing costs → tougher return requirements → greater CapEx scrutiny → slower growth in accelerator orders → weaker incremental HBM demand.
There is no evidence yet that hyperscalers are about to cut spending sharply. But the credit market is beginning to price more uncertainty around AI monetisation and funding sustainability, while semiconductor earnings expectations remain close to peak levels. Reuters also cited concerns that AI adoption is accelerating faster than the visibility on profits and long-term financing.
What to Watch Next
The technical setup is deeply oversold, so a short-term rebound would not be surprising. However, Monday's long bearish candle closed near its low, downside momentum is still expanding and volume did not show a clear capitulation extreme.
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