South Korea Rides AI Chip Boom to Rare China Trade Surplus

South Korea has emerged as an unlikely beneficiary of China’s artificial intelligence boom, achieving a rare trade surplus with its largest trading partner as surging demand for memory chips reshapes regional trade dynamics. The country’s trade position swung from a US$764 million deficit with China in December 2025 to a US$3.8 billion surplus in May 2026, according to data from South Korea’s Ministry of Trade, Industry and Resources, as reported by the South China Morning Post.

The AI Chip Boom Reshapes Trade

The turnaround has been driven almost entirely by semiconductor shipments. South Korea’s semiconductor exports to China jumped 243% year-over-year in May 2026, fueled by the global AI boom’s insatiable demand for high-bandwidth memory (HBM) and other advanced memory chips essential for AI training and inference. Memory chip prices have soared dramatically, with 16GB DDR5 memory chips up 682% and NAND flash memory prices up 807%, according to Morgan Stanley.

South Korea’s total exports for May 2026 hit a record US$87.75 billion, up 53.2% year-over-year, with semiconductors accounting for 42.3% of that total at US$37.16 billion, as reported by Financial Today. Exports to China alone reached US$18.9 billion, up 80.9% year-over-year.

The scale of the boom is unprecedented. South Korea’s cumulative trade surplus for January through May 2026 reached US$101.91 billion, already surpassing the previous annual record of US$95.2 billion set in 2017 — and doing so in less than half the year.

Korean Chip Giants Double Down on China

Samsung Electronics and SK Hynix, the world’s dominant memory chip suppliers, are ramping up investments in their Chinese fabrication plants to meet the surge in demand. Samsung invested 465.4 billion won (US$308.8 million) in its Xian chip plant in 2025, a 67.5% increase year-over-year. SK Hynix invested 581.1 billion won in its Wuxi plant — up 102% — and 440.6 billion won in its Dalian facility, a 52% increase, according to annual reports filed with Korea’s Financial Supervisory Service and reported by the SCMP.

“Since building new plants typically takes three to five years, optimising operations at existing production bases in China enables a much faster supply response,” said Lee Byung-chul, a visiting research fellow at the Sejong Institute and a former Samsung Electronics executive vice-president who worked at its China subsidiary for 15 years.

Samsung’s Xian facility, its only overseas memory chip fab, accounts for about 40% of its NAND output. SK Hynix’s Wuxi plant produces more than 30% of its total DRAM output.

A Stark Regional Contrast

South Korea’s improving position stands in sharp contrast to other East Asian economies. Japan’s export volumes to China have fallen 10% since 2022, while its imports from China remain elevated, pushing Japan’s trade deficit with China to a record 1.2% of GDP, according to Marcel Thieliant, head of Asia-Pacific at Capital Economics.

This divergence highlights how the AI chip boom is reshaping regional trade dynamics in a highly uneven manner, creating clear winners and losers across East Asia.

The US Export Control Paradox

The surge in South Korean chip exports to China creates an ironic dynamic. US export controls, first imposed in October 2022 and progressively tightened since, have restricted American companies like Nvidia from selling advanced AI chips to China. Yet these restrictions have redirected Chinese demand toward memory chips — a category where South Korea dominates and which remains less restricted. The result is that US policy has indirectly boosted a key ally’s economy while failing to fully contain China’s AI ambitions.

However, this dynamic faces significant uncertainty. The US recently closed a loophole that allowed Chinese firms to access Nvidia AI chips through foreign subsidiaries, as reported by The Outpost. Meanwhile, proposed legislation like the MATCH Act could extend controls to block China from accessing deep ultraviolet (DUV) lithography tools, directly impacting South Korean chipmakers operating in China.

Outlook and Risks

Analysts warn that South Korea’s AI-driven trade surplus with China may be temporary. The memory chip cycle is inherently cyclical, and prices could normalize as supply catches up with demand. China is also aggressively pursuing semiconductor self-sufficiency, targeting 70% domestic wafer production and aiming for 80% chip self-sufficiency by 2030, as Tech Wire Asia reports.

Kim Jeong-gwan, South Korea’s Minister of Trade, Industry and Energy, acknowledged the uncertainties ahead. “Uncertainties in the trade environment remain, including the end of the Middle East war, US tariffs, and EU steel import quotas,” he said. “We will actively support corporate production and export activities through stable introduction of key imported raw materials and supply chain inspections.”

For now, South Korea is riding a wave that has transformed its economic relationship with China. The question is how long the wave will last — and what happens when it recedes.