South Korean Stocks Plunge Amid DeepSeek Model's Memory Chip Demand Fears
Key Summary
South Korean stocks have slid due to concerns over demand for memory chips, with investors worried about the impact of DeepSeek's V4.1-Flash model on the industry. The model's efficiency gains have sparked fears of reduced prices and market share for memory makers.
Precedent & Market Context
The KOSPI index has experienced a 40% drawdown since its June peak, wiping out an entire year's worth of South Korea's GDP. The decline has sparked concerns about the impact of artificial intelligence on the economy. The finance minister has apologized for introducing leveraged single-stock ETFs, which have contributed to the market's volatility.
Main Event
South Korean stocks fell as investors worried about two things: demand for memory chips, and how much longer the money for AI keeps flowing. The biggest casualties were the country's chip giants, Samsung Electronics and SK Hynix. The trigger came from a Chinese AI lab that says it can do more with less.
A model that eats less memory The spark was DeepSeek's V4.1-Flash model, released on September 10, 2026. Its pitch was efficiency, specifically in high-bandwidth memory, or HBM. HBM is the premium memory stacked next to AI accelerators so they can be fed data fast. Samsung and SK Hynix together dominate global supply.
DeepSeek claims V4.1-Flash needs only a quarter of the HBM its predecessors required during inference. That is the stage where a trained model answers user requests. It also claims the model needs one-eighth of the SSD storage.
Analysis & Market Impact
Analysts reported that the stocks were trading at depressed earnings multiples of roughly 2.6-3.1x, well below global peers. KB Securities went further, describing the recent declines as an "asymmetric investment opportunity." The risks are not imaginary, though. If efficiency gains like DeepSeek's spread across the industry, they could reshape pricing for memory products. Add aggressive competition from CXMT, and market share is not guaranteed either.
Implications & Outlook
Macro conditions matter too. Tighter financing and rising inflation make it harder for companies to justify massive AI infrastructure budgets. Memory makers sit downstream of those budgets, so any slowdown reaches them quickly.
South Korean stocks have slid due to concerns over demand for memory chips. DeepSeek's V4.1-Flash model has sparked fears of reduced prices and market share for memory makers.