South Korean Investors Pivot to AI Chips as Samsung and SK hynix Ride Surging HBM Demand

South Korea’s equity market is heavily influenced by Samsung Electronics and SK Hynix, making the semiconductor cycle and foreign investor sentiment central to the KOSPI’s direction. Moody’s said second-quarter economic growth may slow, adding to concerns over the broader outlook. Still, AI-driven semiconductor exports remain a key source of support for the trade-dependent economy and a potential counterweight to weaker domestic momentum.

The KOSPI plunged 5% on July 20 as Samsung Electronics and SK Hynix led declines. Morgan Stanley cut its bearish-case target to 6,000 points, while Citi and Goldman Sachs also issued cautious assessments the same day. The selloff contrasted with longer-term industry optimism: SK Hynix’s chairman forecast that global demand for AI chips will surge 60% to 100% next year.

Explosive growth in global demand for AI chips and high-bandwidth memory is making South Korea’s semiconductor industry increasingly strategic to the global supply chain. Chailease Securities Investment Advisory said the South Korean government’s push for special semiconductor legislation and stock-market reforms is providing policy benefits to the country’s technology giants. The industry shift is reshaping the global technology supply chain and offers investors an important avenue into the long-term AI trend, drawing market attention to the medium- and long-term prospects for South Korean equities.

In its latest assessment released in July 2026, Chailease Securities Investment Advisory said South Korean chip leaders SK hynix and Samsung Electronics have strong medium- and long-term growth momentum as they benefit from the AI chip boom. With the government rolling out a 26 trillion won semiconductor support plan and recently stepping up efforts to advance special legislation, the firm advised investors to build positions gradually through regular fixed-amount investments or by adding holdings on market declines to capture the long-term trend.

Demand for high-bandwidth memory, or HBM, from AI data centers has pushed profits at Nvidia suppliers Samsung Electronics and SK hynix to record highs, helping the Korea Composite Stock Price Index, or KOSPI, nearly triple within 12 months. Employee bonuses and stock-market gains are being converted into home down payments, spreading the chip boom from financial markets to Seoul and semiconductor hubs while widening disparities in wealth and housing affordability.

Samsung’s union and management reached an agreement in May 2026 under which employees are expected to receive average bonuses of 600 million won in early 2027. SK hynix pledged to allocate 10% of its 2026 operating profit, with brokerages estimating that each employee would receive at least 400 million won. KB Real Estate data for June showed that the average price of a three-bedroom home at Dongtan Lotte Castle in Hwaseong was 1.6 billion won, up 28% from a year earlier. The average price across 11 prime Seoul districts reached 1.96 billion won in May, up from 1.68 billion won a year earlier, while transaction volume doubled over six months to 8,245 deals.

South Korea is a global memory-chip powerhouse, with Samsung Electronics and SK hynix leading supplies of DRAM and high-bandwidth memory. Surging demand from AI data centers has made advanced memory central to national competitiveness. The investment is equivalent to about 17% of the global cryptocurrency market’s total value, underscoring the vast amount of capital flowing into AI infrastructure.

On June 29, 2026, the South Korean government unveiled a national semiconductor ecosystem plan under which Samsung Electronics and SK hynix will invest a combined 800 trillion won, or about $518 billion. The companies will build four fabrication plants in the country’s southwest and double DRAM output within five years. The Chungcheong region will focus on packaging, while other regions will expand capacity for components, materials and data centers.

SK Hynix is a major supplier of high-bandwidth memory (HBM) to AI chipmakers including NVIDIA. The expansion of AI data centers by Microsoft, Google and Meta has driven up memory demand and prices. As of 2025, SK Hynix held 61% of the global HBM market, far ahead of Samsung Electronics’ 17%, making it a key force reshaping South Korea’s semiconductor industry.

SK Hynix shares closed 5.6% higher on June 22, 2026, lifting its market capitalization to 2,080.4 trillion won, or about $1.35 trillion. That surpassed Samsung Electronics’ 2,066.7 trillion won valuation excluding preferred shares, ending Samsung’s reign as South Korea’s most valuable company since 2000. SK Hynix also plans to issue about $27 billion of American depositary receipts on Nasdaq as early as mid-to-late July.

The expansion of AI data centers has fueled memory-chip demand, making Samsung Electronics and SK Hynix the main engines of South Korea's stock market. Together, the companies account for 54% of the KOSPI's market capitalization and nearly three-quarters of its gains this year. That has left South Korea's $4.9 trillion stock market highly concentrated, with both the index and leveraged retail-investor positions at risk if AI capital spending cools.

As of June 4, 2026, the KOSPI had risen more than 100% for the year, but it plunged as much as 7% intraday on June 5. Foreign investors have sold a net 15.8 trillion won since the start of June. The Korea Financial Investment Association said margin-financing balances hit a record 38 trillion won on May 29. Although Goldman Sachs raised its index target to 12,000 from 9,000, the market still faces a liquidity test from a potential Bank of Korea interest-rate increase in July.

SK Hynix is a major South Korean memory-chip maker and a key supplier of high-bandwidth memory, or HBM, to NVIDIA. As generative AI and high-performance computing expand, HBM has become a critical component in AI accelerators, prompting investors to reassess the company’s growth potential and industry position.

In the latest trading as of July 2026, SK Hynix’s market capitalization exceeded $1 trillion, making it the third Asian company to cross that threshold. Its shares have doubled so far this year and reached a record high, bringing its market value close to that of Samsung Electronics. Micron also crossed the $1 trillion mark over the same period, while UBS raised its price target for the company to $1,525.

Demand for Nvidia's AI accelerators drives orders for high-bandwidth memory, or HBM. Samsung Electronics and SK hynix together account for nearly half of the KOSPI's market capitalization, magnifying the impact of Nvidia's outlook on South Korean stocks. Samsung's labor dispute also involved 45,000 union members and threatened semiconductor output, making the removal of strike risk another major catalyst for investors betting on the AI supply chain.

After the market closed on May 20, 2026, Nvidia reported FY2027 first-quarter revenue of $81.6 billion, up 85% from a year earlier and above the $79.2 billion market estimate. It issued second-quarter guidance of $91 billion. On May 21, Samsung reached an agreement with labor on an average 6.2% pay increase and called off the strike. The KOSPI closed 8.42% higher at 7,815.59, with Samsung Electronics up 8.51% and SK hynix gaining 11.17%, prompting the Korea Exchange to activate a buy-side sidecar.

Generative AI has fueled demand for high-bandwidth memory (HBM) and server chips, putting Samsung Electronics and SK Hynix at the center of the global AI supply chain. Hedge funds are bullish on South Korea’s leadership in the memory market, betting that AI investment can continue to generate steady cash flow. Semiconductor stocks have consequently become the main engine driving South Korean equities higher.

Since the start of 2026, shares of Samsung Electronics and SK Hynix have risen 128% and 188%, respectively, helping the KOSPI surge about 80% and break above 8,000 for the first time. As South Korean retail investors chase the rally, margin-financing balances have climbed to 36 trillion won, boosting brokerage interest income while underscoring growing leverage and the rising risk of buying at elevated prices.

High-bandwidth memory (HBM) delivers large volumes of data to AI accelerators with high bandwidth and low power consumption, making it a critical component in the race for generative AI computing power. After a downturn in the memory market, SK hynix rebounded through technology investment and its supply partnership with Nvidia, becoming a key company in the global AI semiconductor supply chain.

South Korean broadcaster KBS was granted access to SK hynix’s M16 wafer fabrication plant for the first time. Its program “The World Seen for the First Time” showed the company’s secret HBM production line operating around the clock, along with employees at work. The report did not specify an air date, investment amount or production capacity, but footage from the facility showed the company working at full speed to meet demand for AI memory.