Bank staff work in entrance of a number of screens on the Hana Bank dealing room in Seoul, South Korea, on May 12, 2026.
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Wall Street tech strikes and South Korea’s inventory market are becoming more and more intertwined as synthetic intelligence spending binds collectively the fortunes of U.S. know-how giants and Korean reminiscence chipmakers.
The 60-day correlation between the Kospi and Nasdaq 100 lately climbed to about 0.50, its highest degree since 2021, based on information supplied by Rayliant.
The rising relationship displays the rising dominance of Samsung Electronics and SK Hynix, which collectively account for more than half of the Kospi index. Both corporations sit on the heart of the AI {hardware} provide chain, offering the reminiscence chips wanted for information centres operated by U.S. know-how giants.
“The correlation has increased because the KOSPI has become a semiconductor index,” Rolf Bulk, analyst at Futurum Group, advised CNBC by way of e-mail.
Samsung and SK Hynix more and more rely upon the identical hyperscaler spending that drives earnings at U.S. semiconductor and know-how corporations. Data-center demand rose from round 40% of world DRAM demand final 12 months to more than half this 12 months, based on Bulk, who expects that share to extend additional. DRAM, or dynamic random-access reminiscence, is utilized in AI servers.
That provides buyers in Asia an early learn on the power of the worldwide AI commerce earlier than Wall Street opens.
“Samsung and SK Hynix provide the first liquid market reaction to overnight developments affecting global AI demand,” mentioned Jung In Yun, founding father of Fibonacci Asset Management. “SK Hynix in particular has become an important barometer because of its exposure to high-bandwidth memory, which is one of the most critical components in the AI supply chain.”
Recent buying and selling illustrates that dynamic. On July 13, the Kospi fell more than 8%, dragged by SK Hynix’s 15% plunge and record fall. The Nasdaq 100 adopted swimsuit to finish 1.88% decrease that day. Shares of massive know-how names declined that day. Micron Technology closed 4% decrease, Sandisk shed 12%, Intel pulled again 6%.
Peter Kim, head of world funding technique at KB Financial Group, mentioned the Korean memory-chip rally started later than the Nasdaq’s advance as a result of U.S. buyers initially centered more closely on hyperscalers. The scale and volatility of the current rally, nevertheless, have prompted world buyers to deal with Korea as a bellwether for broader AI trades.
Samsung’s earnings steering may also present one of many first concrete alerts every quarter on the state of AI demand. The firm sometimes reports earnings about two weeks earlier than main U.S. semiconductor corporations.
Analysts cautioned, nevertheless, that Korean and U.S. know-how shares are transferring in tandem, reasonably than one constantly main the opposite.
“The fortunes of U.S. tech stocks and Korean tech stocks are increasingly being driven by a common underlying factor, which is sentiment toward the AI hardware trade,” mentioned Phillip Wool, head of analysis at Rayliant Global Advisors.
When AI-related information breaks whereas U.S. markets are closed, Samsung and SK Hynix can act as proxies for a way buyers could reply when Wall Street reopens. When developments happen throughout U.S. buying and selling, the Nasdaq equally provides a preview of the subsequent Korean session.
The nearer relationship additionally carries dangers. The rising correlation erodes the diversification advantages buyers historically sought by holding U.S. and Korean equities, echoed the trade veterans.
“Korea no longer provides diversification against U.S. tech. With half the index tied to one cyclical theme, a slowdown in hyperscaler capex would hit the Korean market harder than most other markets,” Bulk mentioned.
He added that Korean reminiscence shares are additionally inherently more unstable than many U.S. chipmakers, with swings amplified by leveraged exchange-traded fund flows.
Wool equally highlighted that because the AI theme more and more turns into the dominant driver of each Korean and U.S. know-how shares, buyers are shedding one of many principal causes for holding each markets: geographic diversification.
“When all of these markets are essentially being driven by this one big risk factor, you find that you’ve lost the very benefit — the international diversification — that led you to seek exposure to geographically disparate markets like the US and Korea in the first place.”
That mentioned, there may be better divergence over time. Micron, Samsung and SK Hynix presently profit from the identical rise in DRAM costs, however variations in capital expenditure, product combine and U.S. assist for home chip manufacturing could finally separate their efficiency, mentioned Kim.
China’s enlargement into reminiscence chips can also be one other rising danger, he added. While Chinese producers stay technologically behind their world rivals, their progress has often exceeded investor expectations. Shares of chipmaker Changxin Technology Group soared 466% Monday of their debut on Shanghai’s tech-heavy STAR Market, making CXMT essentially the most priceless China-listed firm.
