Asian stock markets came under renewed pressure Wednesday, Aug. 19, as technology and semiconductor shares led a broad regional selloff, extending Wall Street’s retreat and raising fresh questions about the durability of the AI-driven market rally.
The downturn was fueled by a combination of surging government bond yields, higher oil prices, persistent inflation concerns and fading hopes of an agreement that would allow oil tankers to move freely through the Strait of Hormuz.
South Korea takes the biggest hit
South Korea’s Kospi was among the hardest-hit major Asian benchmarks, plunging 5.2% to 6,515.97, according to AP. Semiconductor giants Samsung Electronics and SK Hynix fell 6.9% and 7.9%, respectively, as investors pulled back from companies closely tied to the global AI boom.
Japan’s Nikkei 225 also dropped 2.6% to 65,703.78, while Taiwan’s Taiex declined 1.4%. Hong Kong’s Hang Seng slipped 0.4%, Shanghai’s Composite fell 1.5%, and Australia’s S&P/ASX 200 lost 0.4%.
CNA reported that markets in Manila, Singapore, Sydney and Jakarta were also lower, underscoring how widely the risk-off mood spread across the region.
Wall Street’s tech selloff sets the tone
The Asian decline followed another difficult session on Wall Street.
On Tuesday, the S&P 500 fell 0.69%, the Nasdaq Composite dropped 1.33%, and the Dow Jones Industrial Average slipped 0.22%. The Nasdaq and S&P 500 recorded their biggest daily percentage declines since July 29.
Technology and semiconductor companies bore much of the damage.
Nvidia fell 2.3%, Micron Technology dropped 7%, and Broadcom declined 3.2%. The Philadelphia Semiconductor Index plunged about 5%, reflecting the sharp reversal in investor appetite for chip stocks that had benefited enormously from the AI investment boom.
The selling was particularly notable because many AI-related stocks had recently staged a strong recovery.
Why rising bond yields matter for AI stocks
At the center of the latest market anxiety is the global bond market.
The yield on the U.S. 30-year Treasury reached 5.3371% on Tuesday, its highest level in nearly 20 years, before easing to around 5.28% during Asian trading Wednesday, Reuters reported. Japan’s 10-year government bond yield was also approaching 3%, while yields in parts of Europe climbed to multi-year highs.
Higher yields can make expensive growth stocks less attractive because investors can earn more from relatively lower-risk fixed-income assets. They also increase the cost of borrowing.
That is particularly important for the technology industry, where companies and AI infrastructure operators are committing enormous sums to data centers, chips and computing capacity.
CNA cited analysts who warned that higher borrowing costs could put pressure on hyperscalers’ capital spending and, in turn, affect companies supplying AI infrastructure.
Oil prices add another layer of pressure
The bond-market turmoil is closely linked to energy prices.
Brent crude climbed to around US$91.83 a barrel, while U.S. crude reached about US$84.88, according to AP. Reuters said Brent remained above US$90 as investors saw little progress toward reopening the Strait of Hormuz to oil tankers.
Higher oil prices can intensify inflation because energy costs feed into transportation, manufacturing and consumer prices.
That creates a difficult environment for central banks: if inflation remains elevated, policymakers have less room to reduce interest rates aggressively.
For stock investors, that combination can be especially painful for high-valued technology companies whose future earnings are more sensitive to changes in interest rates.
AI rally faces another test
The latest decline does not necessarily mean the AI investment story is over.
AI-related companies remain among the biggest market winners this year. AP noted that Micron, despite its latest decline, has more than tripled in value this year.
But investors are becoming increasingly selective.
The question is shifting from whether companies will spend on AI to whether the enormous investments being made today will generate enough revenue and profit to justify current valuations.
Reuters also reported that broader technology and semiconductor shares were under pressure amid market concerns surrounding AI demand and expectations for the sector.
Markets now await the Fed
Attention is now turning toward the U.S. Federal Reserve.
Minutes from the Fed’s July meeting were due Wednesday and could provide investors with clues about how policymakers view inflation, economic conditions and the future path of interest rates.
Investors are also watching upcoming corporate earnings, with Nvidia’s next quarterly report emerging as a particularly important test for the AI-driven rally.
The broader message from markets is becoming harder to ignore: AI enthusiasm remains powerful, but rising financing costs, oil-price shocks and inflation risks are making investors less willing to pay any price for future growth.
For Asian markets, that means the performance of semiconductor and technology stocks could remain highly sensitive to every move in U.S. Treasury yields, crude oil and expectations for interest rates.
And with the Strait of Hormuz uncertainty still unresolved, investors may not get the relief they are looking for anytime soon.
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