Samsung Electronics Stock Plunges Amid AI Spending Fears and Rising Chinese Competition

Samsung Electronics (KS:005930) shares plunged 13.4% on Tuesday, part of a broad and severe selloff in the semiconductor sector driven by dual concerns over heightened competition from China and the sustainability of the artificial intelligence spending boom.

Dual Headwinds Batter Chip Sector

The sharp decline was triggered by two main factors that shook investor confidence. First, the successful market debut of Chinese DRAM maker CXMT revived fears of increased global competition and potential downward pressure on memory chip prices. According to the report, CXMT held approximately 7.7% of global DRAM revenue and 9% of shipments in the first quarter of 2026.

Second, skepticism is growing about the durability of the massive AI infrastructure investments that have propelled chip stocks to historic highs. These concerns were amplified by a report questioning Nvidia's AI financing model, further undermining sentiment for major AI hardware suppliers like Samsung, a leading producer of high-bandwidth memory (HBM) chips for AI servers.

Broad Market Rout

The selloff extended across the South Korean market, dragging down related technology stocks. Shares in SK Hynix (KS:000660), another key memory chip supplier, plummeted more than 14%.

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The widespread selling pressure caused South Korea's benchmark KOSPI index to fall over 10%, triggering a 20-minute circuit breaker for the eighth time this year. The rout in Seoul followed a weak session on Wall Street, reflecting a global retreat from semiconductor equities.

Context: A Sharp Reversal

Tuesday's dramatic downturn marks a sharp reversal for Samsung, whose shares had rallied more than 200% in the first half of 2026. That extraordinary performance was fueled by surging demand for AI infrastructure and rising memory chip prices.

However, the combination of a new competitive threat from China and uncertainty surrounding the AI demand cycle proved overwhelming for a sector with elevated valuations, leading to one of Samsung's worst single-session declines in recent memory.