Bank of Korea flags AI chip boom as systemic financial stability risk

South Korea's economy is booming on demand for artificial intelligence (AI) chips, with nominal GDP growing 21.9% in the first half of 2026.

Almost 70% of that expansion comes from semiconductors alone.

How the AI Chip Boom Is Powering South Korea

The KOSPI is South Korea's benchmark stock index, dominated by semiconductor giants Samsung Electronics and SK Hynix. Both companies now concentrate close to half of their market cap and most of their earnings growth in the first six months of 2026.

The Bank of Korea confirms a scale of chip revenues not seen since the 1970s. Semiconductor exports exceed 40% of the country's total shipments in some months during 2026. Real GDP growth forecasts have been revised upward to 3.3%-3.5% for the year.

Global demand for high-bandwidth memory (HBM) and advanced DRAM chips is the direct trigger of the rally. Nvidia, AMD, Microsoft, Google, Amazon, Meta, and Oracle all depend on Samsung and SK Hynix for AI accelerator memory. Along with Micron, they are the only large-scale global suppliers of these advanced chips.

The rally has also reshaped market structure across the region. Leveraged ETFs listed in Hong Kong tied to major Korean tech names multiplied more than 20-fold during the first half of 2026 alone, according to the Bank of Korea report published this week.

What Happens if the AI Chip Cycle Turns?

Analyst David K. Williams described the concentration bluntly after the Bank of Korea report. The trade has become so large that the central bank treats it as a financial stability issue, not merely an equity rally driven by strong fundamentals.

A slowdown in global AI infrastructure spending expected for 2027 or 2028 would hit the Korean economy systemically. Rising Chinese competition in memory chips could compound the damage. Exposure runs through supply chains, financial markets, and consumer wealth simultaneously across the country.

The Bank of Korea already flags signs of vendor financing similar to the dot-com era. Excess liquidity is flowing into real estate and leveraged products, raising bubble risk. Traditional manufacturing, youth employment, and domestic demand remain weak while chips dominate the narrative.

Structural problems compound the medium-term challenge for the country. South Korea has the world's lowest fertility rate near 0.7 and an aging population profile. Household debt remains high and external shocks like oil above $100 or trade tensions would multiply the vulnerability further.