KOSPI Falls 3.59% as AI Spending Fears Hit Samsung and SK Hynix

South Korea's KOSPI fell 3.59% on November 3 as renewed concerns about the profitability of artificial intelligence investments triggered heavy selling in semiconductor and technology stocks.

The benchmark index closed at 5,648.79, losing 210.29 points and erasing the previous session's gains. Samsung Electronics and SK Hynix led the decline, with both companies facing pressure as investors reassessed the outlook for the global AI infrastructure boom. 

Samsung Electronics dropped 4.15% to 219,500 won, while SK Hynix declined 5.03% to 1,398,000 won. Other technology-related stocks also weakened, including Samsung Electro-Mechanics, which fell 7.38%.

The sell-off reflected concerns spreading from Wall Street that massive spending on AI infrastructure may not translate into sufficient returns for technology companies.

Samsung and SK Hynix Lead the Market Decline

Semiconductor stocks were among the biggest contributors to Tuesday's market weakness.

Samsung Electronics and SK Hynix have benefited from growing demand for memory chips used in AI servers. However, their share prices came under pressure as investors questioned whether the current pace of AI investment can be sustained.

The weakness followed a difficult session for U.S. technology stocks. The Nasdaq Composite fell 1.07%, while the Philadelphia Semiconductor Index dropped 3.4%. Those declines added pressure to Asian technology shares when markets opened. 

The decline also extended beyond the two largest chipmakers. SK Square, the parent company of SK Hynix, lost 5.37%, while LG Energy Solution fell 5.06%.

The broad selling suggests that investors were reducing exposure across several technology and growth-related sectors rather than reacting to one company's earnings or business outlook.

Oracle's $20 Billion Funding Plan Raises Questions

A major concern behind the sell-off was the growing cost of building AI infrastructure.

Oracle announced plans to raise approximately $20 billion through a combination of stock and corporate bonds to support its AI infrastructure expansion. The plan renewed questions about how large technology companies will finance the data centers, computing capacity and other infrastructure needed to support AI demand. 

Investors are increasingly looking beyond revenue growth and asking whether companies can generate enough cash flow and profits to justify their spending.

The concern is particularly relevant for semiconductor manufacturers. Companies such as Samsung Electronics and SK Hynix supply memory products used in AI systems. Their growth prospects are tied partly to continued investment by cloud providers and other technology companies.

If those customers slow infrastructure spending or become more selective about new projects, expectations for future chip demand could change.

However, the funding announcement does not prove that AI investment is slowing. It highlights the financing requirements behind the expansion and the growing importance of returns on that capital.

Foreign Investors Sell ₩1.53 Trillion in Korean Shares

Investor flows added to the pressure on the Korean market.

Foreign investors were net sellers of approximately ₩1.53 trillion worth of KOSPI shares on November 3. Institutional investors also sold around ₩514.7 billion.

Individual investors moved in the opposite direction, buying approximately ₩1.66 trillion worth of shares. Their purchases were not enough to offset the selling from foreign and institutional investors. 

The KOSPI recorded 656 declining stocks against 220 advancing stocks, showing how broadly the selling spread across the market. 

The figures point to a difference in positioning between foreign investors and domestic retail buyers. While individual investors stepped in to buy shares during the decline, larger institutional flows remained negative.

Is the AI Rally Losing Momentum?

Tuesday's decline highlights a growing debate over the sustainability of the AI investment cycle.

Demand for AI computing remains an important growth driver for semiconductor companies. Samsung and SK Hynix are major suppliers of memory products used in data centers, including high-bandwidth memory and server-related components.

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But investors are increasingly examining the financial commitments behind the AI expansion. Large infrastructure budgets, debt issuance and uncertain returns could make markets more sensitive to future spending announcements.

The distinction is important: weaker share prices do not necessarily mean demand for AI chips has collapsed. They may instead reflect a reassessment of how much investors are willing to pay for future growth.

For the KOSPI, the performance of Samsung Electronics and SK Hynix will remain important because of their influence on the benchmark index.

The next signals to watch include earnings updates from major technology companies, new AI infrastructure spending plans and evidence that demand for advanced memory chips remains strong.

For now, Tuesday's sell-off shows that investors are no longer looking only at how much companies are spending on AI. They also want to know when that investment will translate into sustainable profits.