South Korea’s memory chip giant SK Hynix is reportedly evaluating plans to build a large-scale memory wafer fabrication plant in Miyagi Prefecture in northeastern Japan, with preliminary discussions pointing to an investment of up to tens of trillions of Korean won (equivalent to tens of billions of U.S. dollars). If the plan is ultimately confirmed, it would mark the first time a South Korean semiconductor company has made a major investment to establish a production base in Japan, reshaping the landscape of the Northeast Asian semiconductor supply chain.
Industry sources revealed that SK Group Chairman Chey Tae-won recently visited Miyagi Prefecture in person to conduct an on-site assessment of the local investment environment. Miyagi Prefecture, alongside Kyushu and Hokkaido, is one of three semiconductor industry hubs that the Japanese government is prioritizing for development, and has received substantial government subsidies in recent years.
Compared with the hundreds of trillions of won-scale semiconductor industrial clusters SK Hynix is planning in Yongin and the Honam region of South Korea, the Miyagi plant is expected to be relatively smaller in production scale, positioned as a new overseas production site. Market observers interpret the move as a response to the persistently tight global memory chip supply, with the company seeking to expand capacity through preemptive investment and seize the first-mover advantage in meeting explosive demand for High Bandwidth Memory (HBM) from AI server and enterprise storage markets.
If the plan materializes, SK Hynix would become the third overseas company to operate a semiconductor manufacturing facility in Japan, following Micron and TSMC. Samsung Electronics, South Korea’s other memory giant, currently operates only a next-generation semiconductor packaging research institute in Yokohama and has yet to establish a large-scale production line in Japan.
The Tohoku region of Japan is home to a dense concentration of semiconductor materials and equipment manufacturers, with well-developed power infrastructure and an ample pool of skilled industrial workers—key factors attracting SK Hynix to consider Miyagi Prefecture as an overseas fab site candidate. By tapping into Japan’s local materials and equipment supply chain, SK Hynix could reduce the risk of over-concentrating production capacity in a single region of South Korea and achieve a more diversified global production network.
However, the investment plan still faces multiple obstacles before it can move forward.
The primary risk stems from pressure from the United States. The U.S. government has been continuously pressuring the South Korean government and domestic companies to build memory fabs in America. Once SK Hynix’s investment in Japan is formally confirmed, Washington is likely to further demand expanded fab construction on U.S. soil, complicating the calculus for South Korean companies in choosing investment locations.
Secondly, public sentiment in South Korea regarding investment in Japan in the strategic semiconductor sector remains guarded. Semiconductors are viewed as a strategic industry for South Korea, and placing critical production capacity in Japan could raise domestic concerns about technology outflow and industrial hollowing-out. Political uncertainty also constitutes another variable.
SK Hynix has been highly active in capacity expansion recently. In addition to advancing construction of a new NAND flash memory fab in Cheongju, South Korea, the company has also resumed work on the No. 2 plant at its NAND production base in Dalian, China. Facing an AI-driven memory supercycle, SK Hynix is clearly and aggressively seeking the most cost-effective capacity allocation options on a global scale.
In response to reports about building a fab in Japan, SK Hynix responded cautiously, stating only: “Any region with supporting infrastructure could be included in the scope of evaluation, but no decision has been made regarding building a fab in Japan or the specific site selection.”
Market analysts noted that in the short term, establishing a fab in Japan would help SK Hynix diversify geopolitical risks and move closer to its upstream supply chain. However, given that neither the investment scale nor the construction timeline has been finalized, the tens of trillions of won investment plan and the Miyagi Prefecture site selection still warrant further observation.