South Korean Chip and Leveraged-Position Selloff Triggers KOSPI Circuit Breaker

South Korean equities have become increasingly tied to a small group of artificial-intelligence and semiconductor heavyweights, while retail investors have amplified market swings through margin borrowing and other leveraged trades. That concentration matters beyond Seoul: South Korea and Taiwan sit at the center of the global chip supply chain, allowing forced selling in Korean technology shares to tighten regional liquidity and pressure Taiwan-listed semiconductor stocks.

During the latest selloff, Korean stock-market volatility climbed above 60%, surpassing Bitcoin, while repeated circuit breakers were triggered as leveraged positions were unwound. The report linked the speculative buildup to policies under President Lee Jae-myung and said the retreat in AI-chip shares set off margin calls and forced deleveraging. The resulting liquidity shock spilled into Taiwan equities. The supplied material did not specify an exact index loss, financing amount or calendar date for the moves.

A renewed escalation in geopolitical conflict in the Middle East sent global financial markets into turmoil. South Korea is a key bellwether for the global semiconductor and technology industries, making its market performance significant for the worldwide electronics supply chain. The selloff showed the direct impact of geopolitical crises on the technology sector and fueled a rapid flight from risk, putting pressure on both the previously buoyant AI chip market and cryptocurrencies.

As tensions in the Middle East escalated sharply on July 15, 2026, South Korea’s benchmark KOSPI plunged more than 8% that day, triggering its seventh circuit breaker of the year. Shares of leading AI memory-chip maker SK hynix tumbled 13% under heavy selling pressure. The cryptocurrency market also declined, with Bitcoin falling below $63,000 as global investors accelerated their retreat from risky assets.

Demand for Nvidia's AI accelerators drives orders for high-bandwidth memory, or HBM. Samsung Electronics and SK hynix together account for nearly half of the KOSPI's market capitalization, magnifying the impact of Nvidia's outlook on South Korean stocks. Samsung's labor dispute also involved 45,000 union members and threatened semiconductor output, making the removal of strike risk another major catalyst for investors betting on the AI supply chain.

After the market closed on May 20, 2026, Nvidia reported FY2027 first-quarter revenue of $81.6 billion, up 85% from a year earlier and above the $79.2 billion market estimate. It issued second-quarter guidance of $91 billion. On May 21, Samsung reached an agreement with labor on an average 6.2% pay increase and called off the strike. The KOSPI closed 8.42% higher at 7,815.59, with Samsung Electronics up 8.51% and SK hynix gaining 11.17%, prompting the Korea Exchange to activate a buy-side sidecar.