Deeply tied to Nasdaq! Korean stock market transforms into a "semiconductor index," sparking investor concerns

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The AI boom has tightly welded the Korean stock market to Wall Street tech stocks, but this connection is becoming a double-edged sword.

On July 28, data provided by Rayliant showed that the 60-day correlation coefficient between the KOSPI and the Nasdaq 100 index recently rose to about 0.50, the highest level since 2021.

The root of this change lies in the market cap expansion of Samsung Electronics and SK Hynix—the two companies together now account for more than 50% of the KOSPI index’s weight. They are core nodes in the AI data center hardware supply chain, specifically providing the necessary memory chips for data centers operated by US tech giants.

Futurum Group analyst Rolf Bulk told CNBC: "The rise in KOSPI correlation is because it has essentially become a semiconductor index."

Korean Stock Market: The "Asian Outpost" of the AI Rally

Samsung and SK Hynix are highly reliant on the capital expenditures of the same batch of hyperscale cloud firms, and these expenditures equally drive the performance of American semiconductor and tech companies.

Bulk pointed out that the proportion of global DRAM demand from data centers has risen from about 40% last year to more than 50% this year, and it is expected to keep growing. DRAM (Dynamic Random Access Memory) is a core component for AI servers.

This structure gives Asian investors a unique advantage: capturing global AI trading signals before Wall Street opens.

Jung In Yun, founder of Fibonacci Asset Management, said: "Samsung and SK Hynix provide the first liquidity market response for events occurring overnight that affect global AI demand. SK Hynix has especially become a key barometer because of its substantial exposure in the high-bandwidth memory (HBM) field, which is one of the most critical components in the AI supply chain."

Recent market moves confirm this logic. On July 13, dragged down by SK Hynix’s single-day crash of 15% (the largest drop in history), the KOSPI plunged more than 8% that day. The Nasdaq 100 subsequently closed down 1.88%. On the same day, Micron Technology closed down 4%, SanDisk fell 12%, and Intel retreated 6%.

Peter Kim, Global Investment Strategy Director of KB Financial Group, said that the rise in Korean memory chip stocks started later than on the Nasdaq because US investors initially focused more on the hyperscale cloud firms themselves. But the scale and volatility of recent rises have prompted global investors to view Korea as a broader AI trading barometer.

Moreover, Samsung’s earnings guidance is typically released about two weeks earlier than those of major US semiconductor companies, making it one of the first concrete signals about AI demand each quarter.

Two-way Transmission, Not One-way Leadership

Analysts also remind that the linkage between US and Korean tech stocks is synchronous, not one consistently leading the other.

Phillip Wool, Head of Research at Rayliant Global Advisors, said: "The fate of US tech stocks and Korean tech stocks is increasingly being driven by the same underlying factor, which is market sentiment on AI hardware trades."

When AI-related news breaks during US market closures, Samsung and SK Hynix can serve as proxy indicators for Wall Street investor reactions upon reopening; conversely, when news occurs during US trading hours, Nasdaq likewise provides predictive clues for the next Korean trading day.

Diversification Value Vanishes, Risk Concentration Rises

The rise in correlation is eroding the diversified returns that investors traditionally sought by holding both US and Korean stocks.

Bulk bluntly stated: "Korea can no longer hedge the risk of US tech stocks. Half the index is tied to a single cyclical theme, and if hyperscale cloud firm capital expenditures slow, the Korean market will be hit harder than most other markets."

He further noted that the volatility of Korean memory stocks themselves is higher than that of many US chip stocks, and leverage ETF fund flows further amplify this volatility.

Wool’s view aligns with this: "When all these markets are essentially driven by the same major risk factor, you find you’ve lost the original reason for seeking exposure in geographically dispersed markets like the US and Korea—international diversification."

Of course, analysts also point out factors that could cause future divergence between US and Korean market trends.

Kim said Micron, Samsung, and SK Hynix are currently all benefiting from rising DRAM prices, but differences in capital expenditure scale, product structure, and US policies supporting domestic chip production could eventually lead to performance divergence.

The expansion of Chinese memory chip makers is another uncertain factor. Kim pointed out that Chinese firms often surpass investor expectations in progress. ChangXin Technologies’ stock price soared 466% on its first trading day on the STAR Market, becoming the highest market cap listed company on China’s A-share market.

Risk Disclosure and DisclaimerThe market has risks; investment requires caution. This article does not constitute personal investment advice, nor does it take into account the special investment objectives, financial status, or needs of individual users. Users should consider whether any opinions, views, or conclusions in this article suit their specific circumstances. Investing based on this is at your own risk. ```