SK Hynix (SKHY) stock fell as much as 11.3% in Seoul on Thursday, with its Nasdaq-listed ADR dropping around 9%, reversing nearly all of Wednesday’s sharp rebound.
The Korean shares had surged nearly 13% on Wednesday. The ADR had jumped 27% in that same session. Thursday erased most of that in one day.
The immediate trigger was a broad US chip sell-off. Micron (MU) fell about 8% on Wednesday. Dell dropped nearly 10%. SanDisk, Western Digital and other storage names all took heavy losses as investors rotated toward large-cap tech platforms and away from infrastructure suppliers.
David Russell, global head of market strategy at TradeStation, said investors may have already “priced in years of growth.” That kind of positioning leaves little room for error.
SK Hynix has become one of the clearest proxies for the AI memory trade. Its Seoul shares had more than tripled in 2026 before this latest bout of turbulence.
The Nasdaq listing on July 10 added a new layer of volatility. Options and leveraged single-stock ETFs now mechanically amplify moves in both directions — up and down. The boom-bust swings have become almost mechanical.
The broader Korean market context made things worse. The KOSPI dropped 7.3% on Thursday. The Korea Exchange triggered a sell-side sidecar — suspending program sell orders for five minutes near the open. It was the 19th such halt this year.
Samsung Electronics dropped more than 7% in the same session. Seoul Semiconductor fell over 5%. The weakness was sector-wide.
South Korea also raised interest rates for the first time in more than three years, adding pressure. Geopolitical concerns around fresh US military strikes on Iran added further risk-off sentiment.
Quarterly earnings are due on July 22, and pre-result uncertainty is keeping investors cautious. Regulators also flagged plans to address volatility linked to leveraged single-stock ETFs.
The bull case is built on high-bandwidth memory. HBM chips are more complex to produce and harder to scale quickly. They’re essential to Nvidia and other AI accelerators, which limits supply expansion.
Barclays analyst Simon Coles initiated coverage with an Overweight rating and a $330 price target. He expects the memory shortage to intensify in 2027, with SK Hynix holding more than half the HBM market.
IBK Securities analyst Kim Woon-ho raised his Korean share target to 4 million won, forecasting an 11th consecutive quarterly earnings beat as demand spreads from HBM into conventional DRAM and NAND. Hanwha Investment & Securities sits even higher at 4.3 million won.
On the other side, BNK Investment & Securities analyst Lee Min-hee holds a more cautious view, with a Hold rating and a 1.85 million won target. Lee acknowledges strong AI-server demand but warns that hyperscaler spending momentum could slow if financing costs rise or AI returns disappoint.
New capacity being built to address today’s supply crunch could start easing constraints in 2027 and 2028 — potentially repeating the memory industry’s familiar cycle of oversupply following a boom.
SK Hynix reports quarterly results on July 22.
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