South Korea's government has unveiled a significantly scaled-back semiconductor investment plan, pegging the official figure at 800 trillion won ($518.3 billion)—roughly 40% of the 2,000 trillion won ($1.3 trillion) group-level number that had been floated ahead of Monday's presidential briefing. The revised headline, while still representing a massive bet on AI infrastructure, failed to reassure investors, sending shares of Samsung Electronics (KRX:005930) down 4.86% and SK Hynix (KRX:000660) down 1.68% in Seoul trading.
The plan, which aims to build four new fab sites in the southwestern region of the country, includes contributions from Samsung, SK Hynix, and their suppliers. Each company is expected to establish two large fabrication facilities. Additionally, the government is exploring an extra 81 trillion won investment for a new advanced packaging cluster in the Chungcheong region, closer to Seoul. This cluster is seen as a critical component for high-bandwidth memory (HBM) stacking and advanced packaging technologies.
The gap between the earlier 2,000 trillion won estimate and the official 800 trillion won figure matters because shareholders pay for capacity with cash, not just headlines. The fab pledge is where memory supply, equipment orders, and later depreciation show up. The larger numbers had included data centers, physical AI projects, and plans from conglomerates that might fall outside listed memory or could run through the next chip cycle. The official plan now provides a more direct line to DRAM and HBM supply risk.
Market reaction was swift. The KOSPI closed down 0.2% at 8,394.65, with foreign investors selling a net 7.73 trillion won of local equities. Samsung shares fell to 323,000 won, while SK Hynix slipped to 2.62 million won. The moves came even though traders did not get a clear sign of stronger demand. Lee Kyoung-min, an analyst at Daishin Securities, noted that the AI infrastructure plan is a long-term boost for semiconductors but provides "only limited support for chip stocks" because price worries continue to hang over the sector.
Despite the market's lukewarm reception, South Korea's chip exports remain robust. Semiconductors accounted for 41.2% of the country's exports in the first 20 days of June, with chip shipments surging 188.4% year-over-year. A Reuters poll suggested exports likely jumped 61.0% in June, the fastest since October 1978, primarily driven by chip demand. An Ki-tae, economist at NH Investment & Securities, said memory chip exports will probably stay strong, while Park Sang-hyun at iM Securities pointed to more support for non-chip shipments from a global rebound and cheaper oil.
Execution remains a key hurdle. SK Group Chairman Chey Tae-won told investors that supply is set to lag demand, stating, "Demand will continue to outstrip supply." He also pitched an initial 5 gigawatts of AI data centers, expanding later to 10 gigawatts. However, Chey highlighted the challenges, noting that "a chip factory requires massive land, power, water and talent," and that it took SK nine years to get its Yongin cluster done. Samsung Chairman Jay Y. Lee called Gwangju the candidate site with "the greatest potential" due to power, water, labor, and state support, while noting that Samsung's high-bandwidth memory spending will center on Cheonan and Onyang.
Looking ahead, the next market moves are unlikely to be driven by ceremony numbers. Investors are now closely watching Samsung and SK Hynix capex schedules, permits, utility deals, and tool orders linked to the four southwest fabs. The focus has shifted from headline figures to tangible execution, as the market seeks clear signals of capacity expansion and demand sustainability.
