Semiconductor Stocks Plunge 9%: AI Oversupply Fears and Market Outlook
Domestic semiconductor stocks plunged over 9% following a US tech sell-off, collapsing the KOSPI 8,000 level. We analyze the impact of Meta-driven AI oversupply fears and the market outlook.
Fears of AI Supply Glut Trigger Global Tech Sell-off
On July 2, 2026, the stock prices of major domestic semiconductor companies plummeted, leading a broader market decline. The primary trigger for this sell-off was a tech stock rout in the US. Reports that Meta is considering leveraging its data center infrastructure to offer cloud services to external customers were interpreted by the market as a sign of oversupply in AI computing resources.
Fears that the expansion of AI infrastructure may have reached its limit caused major semiconductor stocks like Micron (-10.57%) and SanDisk (-10.62%) to plunge overnight in New York. The Philadelphia Semiconductor Index (SOX) also dropped by over 6%, acting as a direct headwind for the domestic market. (Source: Yonhap News TV, 2026-07-02)
Samsung, SK Hynix Plunge as Sell Sidecar Activates
The US market shock directly impacted domestic semiconductor leaders. Samsung Electronics fell 9.06%, relinquishing the 300,000 won mark at the close, while SK Hynix plummeted 14.57% to the 2.1 million won level. Due to the sharp decline in top-tier market cap stocks, the KOSPI index closed at 7,648.09, down 7.89% from the previous trading day, breaking down the psychological support level of 8,000.
- Supply and Demand: Foreign investors net sold over 4 trillion won on the KOSPI market, marking their 10th consecutive session of net selling. While retail investors countered with massive net purchases, it was not enough to defend the index.
- Sell Sidecar: Due to extreme intraday volatility, a 'sell sidecar'—temporarily suspending program sell orders—was activated on both the KOSPI and KOSDAQ markets. (Source: FO Economy, 2026-07-02)
Outlook: Fundamental Damage or Market Overreaction?
Market analysts suggest that this semiconductor stock weakness is more likely an overreaction to the 'AI infrastructure peak theory' rather than fundamental damage to the industry. While capital expenditures by Big Tech may face short-term adjustments, the long-term demand for AI remains robust.
Investors should avoid being swept up in short-term volatility and instead take a cautious approach, verifying the reality of the demand slowdown through the upcoming earnings reports and forward guidance of major domestic and international semiconductor companies.