AI demand is driving South Korea’s biggest semiconductor expansion yet.
Samsung Electronics and SK Hynix are set to invest a combined 911 trillion won (about $590 billion) in a semiconductor expansion to boost South Korea's chip production and spread industrial growth beyond the Seoul metropolitan area.
The investment, announced Monday as part of President Lee Jae Myung's "Three Mega Projects for the Great Leap Forward," will fund new memory chip fabrication plants, advanced chip packaging facilities, and long-term semiconductor research, according to the Financial Times.
New chip hubs outside Seoul
Under the plan, Samsung and SK Hynix will each build two new semiconductor fabrication plants in South Korea's southwestern region, where the government hopes to establish a second major chipmaking belt. Another 81 trillion won will be invested in an advanced chip-packaging cluster in the country's central region.
President Lee said South Korea is "at a turning point for a new great leap forward" and added, "We must swiftly complete the chip production hubs under construction and secure overwhelming manufacturing capacity through large-scale investment in the south-west," according to the Financial Times.
The government will also invest around 30 trillion won over the next 15 years to develop next-generation memory, AI server chips, on-device AI processors, and defense semiconductors.
Why the expansion matters
The announcement comes as AI continues to fuel unprecedented demand for memory chips, particularly high-bandwidth memory (HBM), a critical component used in AI accelerators and data centers.
Samsung and SK Hynix together control roughly 80% of the global HBM market, placing them at the center of the AI infrastructure race. Major technology companies are spending heavily on AI data centers, increasing pressure on chip suppliers to expand production.
The South Korean government also sees the project as a way to reduce the country's economic dependence on the Seoul region by encouraging large-scale manufacturing in less-developed areas.
Challenges remain
While the investment underscores confidence in long-term AI demand, analysts warn that rapidly adding production capacity carries risks.
Morningstar analyst Jing Jie Yu cautioned that new factories could eventually create excess supply if AI spending slows after the new facilities come online. "Demand outpaces supply initially as fresh capacity takes two to three years at the minimum to come online but often leads to oversupply in tail years as peak capacity is brought up at the moment demand tapers off," Yu wrote in a note cited by the Financial Times.
Some industry observers have also questioned whether relocating production farther from South Korea's established semiconductor ecosystem near Seoul could complicate supply chains and make it harder to attract skilled workers.
Investors reacted cautiously to the announcement. Samsung shares fell around 4% to 5% on Monday, while SK Hynix also closed lower amid a broader pullback in semiconductor stocks, according to CNBC.
A high-stakes game of chicken
This is a strategic hedge against the AI cycle. Seoul is prioritizing national industrial dispersal over immediate corporate efficiency. However, the memory industry is brutally cyclical; the two- to three-year lag to bring these fabs online means they are essentially betting on sustained hyperscaler demand through the late 2020s.
If AI capital expenditure tapers off as these massive facilities reach peak output, South Korea risks a glut that could erase the very profits funding this expansion.
Moreover, while SK Hynix currently leads as Nvidia's primary HBM supplier, Samsung is aggressively investing to close the technology gap. This massive expansion forces both rivals to compete not just on transistor density, but on logistics, infrastructure, and human capital in regions where they lack established ecosystems.
With the US pushing chipmakers to build on American soil and China aggressively expanding its own semiconductor ambitions, South Korea is staking its claim as the indispensable memory chip supplier of the AI era.
For consumers, more capacity could eventually ease the chipflation squeezing device prices. But if AI spending cools before the fabs come online, the bill for this bet could be steep.