Global stocks fell on Tuesday as renewed concerns over competition in the artificial intelligence industry hit high-flying semiconductor companies, prompting investors to seek shelter in government bonds.
Asian markets bore the brunt of the selloff, with South Korea’s benchmark index suffering its steepest daily decline since mid-August, as investors reassessed whether years of AI-driven gains had left chipmakers vulnerable to disruption and excessive valuations.
Reports of progress by Chinese memory chipmaker CXMT intensified concerns that China’s expanding semiconductor industry could challenge established suppliers sooner than investors had anticipated. The unease was compounded by comments from Broadcom chief executive Hock Tan, who likened some of the money flowing into the broader AI sector to “casino gambling,” adding to questions about whether investment enthusiasm has run ahead of sustainable commercial returns.
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The MSCI All Country World Index fell 0.14%, while its broadest index of Asia-Pacific shares outside Japan dropped more than 2% to its lowest level since late July. The declines highlighted the concentration of risk in markets that have benefited disproportionately from the global AI investment boom, particularly those with large semiconductor manufacturers and suppliers.
South Korea’s KOSPI plunged more than 5%, while Samsung Electronics fell 7.4% and SK Hynix lost 10%. Taiwan Semiconductor Manufacturing Company, the world’s largest contract chipmaker, declined 1.8%, while Japan’s SoftBank, a major investor in AI-related businesses, dropped 8%.
The pressure extended to US markets, where Nasdaq futures fell 0.5%. Micron Technology, a major memory chip producer, declined 2.5% in premarket trading, while Nvidia, the leading supplier of AI accelerators, fell 0.6%.
European equities moved in the opposite direction. The pan-European STOXX 600 rose 0.5% to a one-week high, supported by the region’s relatively limited exposure to the technology sector and a retreat in oil prices. The divergence suggested that the selloff was concentrated in markets and companies most closely associated with the AI trade rather than representing a uniform retreat from global equities.
The immediate catalyst was concern that progress by CXMT could intensify competition in memory chips, a critical component of AI infrastructure. As AI developers and cloud providers build out computing capacity, demand for advanced memory has become an important part of the semiconductor investment cycle. Any indication that additional suppliers could compete more effectively threatens assumptions about how long existing manufacturers can sustain exceptional demand, pricing power, and profits.
For investors, the concern extends beyond the arrival of another competitor. Semiconductor companies have benefited from expectations that AI-related spending will continue to expand, supporting earnings growth and justifying elevated share prices. If technological progress or new capacity changes the competitive landscape faster than expected, forecasts for future revenue, margins and returns on investment may need to be revised.
Julien Lafargue, chief market strategist at Barclays Private Bank, said investors were increasingly recognizing that the memory chip business remains cyclical, despite the extraordinary demand associated with AI.
“People were potentially expecting the sector to remain undisrupted maybe for another couple of years,” Lafargue said. “It looks like the news overnight means that maybe this timeline has to shrink and the competition could be more fierce as soon as next year.”
His comments point to a central vulnerability in the current AI investment cycle: the assumption that strong demand will translate into durable profitability for the companies supplying the infrastructure. Memory chips are essential to AI computing, but suppliers remain exposed to shifts in capacity, pricing, and competition. Strong demand today does not guarantee that margins will remain elevated as manufacturers expand production and new competitors improve their capabilities.
The scale of the market reaction also indicates how concentrated investor exposure has become. South Korea’s sharp decline was particularly significant because its leading technology companies sit at the center of the global semiconductor supply chain. When investors question the sustainability of earnings growth or the durability of competitive advantages, those markets can experience outsized moves.
Tan’s warning about “casino gambling” added another dimension to the selloff by raising concerns about capital allocation across the wider AI sector. Massive investment in computing infrastructure has supported corporate earnings and economic growth over the past four years, but investors are increasingly weighing the cost of that spending against the timing and scale of the returns.
AI adoption may continue to expand even if some of the companies supplying the technology face weaker margins or investors become less willing to pay premium valuations. The market is therefore confronting two related but separate questions: whether demand for AI infrastructure will endure and whether the businesses attracting the most capital can generate returns sufficient to justify their valuations.
Treasury Bonds Attract Buyers, but Inflation Remains a Threat
As technology stocks weakened, investors moved towards government bonds following a recent surge in yields. The benchmark 10-year US Treasury yield slipped to 5.193%, retreating from the 24-year high of 5.364% reached last week.
The decline offered some relief after a series of bond-market selloffs pushed borrowing costs to multi-decade highs across major economies. Rising yields have become a source of pressure for financial markets because they increase the cost of financing for households, businesses and governments while making future corporate earnings less valuable in present terms.
The recent selloff has been driven by a difficult combination of inflationary pressure from elevated energy prices and concerns about expanding government debt. Higher oil prices can feed into consumer and business costs, complicating central banks’ efforts to contain inflation. At the same time, heavy government borrowing increases the volume of debt investors must absorb, potentially requiring higher yields to attract sufficient demand.
Charu Chanana, chief investment strategist at Saxo Bank, said investors were returning to US Treasuries after the sharp rise in yields but cautioned that the move could be temporary.
She described the rebound as “a tactical rally,” adding that “sticky inflation, elevated oil prices and heavy government borrowing remain obstacles to a sustained bond recovery.”
That warning suggests the fall in yields should not yet be interpreted as a decisive change in the bond-market outlook. Investors may be taking advantage of higher yields to buy government debt, but persistent inflation or further increases in borrowing requirements could quickly renew selling pressure.
Wednesday’s US consumer price index report is the next major test. Traders are pricing in an 80.6% probability that the Federal Reserve will leave interest rates unchanged later this month, up from 51% a month earlier, according to the CME FedWatch tool.
The increase in expectations for a pause indicates that investors have become less convinced that the Fed will deliver another immediate rate increase. However, the inflation report could alter that assessment. A stronger-than-expected reading would reinforce concerns that price pressures remain entrenched, potentially pushing Treasury yields higher again and placing additional pressure on equities. A softer result could strengthen expectations that policymakers can afford to wait for more evidence before tightening further.
The relationship between bonds and technology stocks is getting stronger in the current environment. Higher yields can reduce the appeal of growth stocks by increasing the discount rate applied to expected future earnings. A sustained decline in yields could ease that pressure, although it would not resolve the competitive and valuation concerns confronting semiconductor companies.
Bank Earnings and Oil Prices Add to Market Uncertainty
Investors are also preparing for results from major US banks, which could reveal how the recent increase in Treasury yields has affected lending, funding costs and dealmaking.
JPMorgan Chase, Goldman Sachs, Citigroup and Wells Fargo, four of the six largest US lenders, were due to report earnings later on Tuesday. Their results and management commentary are likely to offer insight into the effects of higher borrowing costs on credit demand, loan growth and capital markets activity.
For banks, higher rates can support income from some lending activities, but the benefits are not uniform. Rising funding costs can squeeze margins, while expensive credit may discourage borrowers and weigh on loan demand. Higher market yields can also complicate corporate financing and investment decisions, making banks’ assessments of credit quality and economic conditions important signals for investors.
Oil prices, meanwhile, eased as traders assessed the risks posed by attacks on Saudi Arabia and the possibility of additional Russian diesel supplies entering global markets. Brent crude futures fell 1.7% to $104.78 a barrel, remaining just below the two-week high reached a day earlier.
The decline in oil offered some relief to inflation-sensitive assets, although crude remained elevated enough to sustain concerns about energy costs. The prospect of additional Russian diesel supplies could help ease pressure on fuel markets, but the broader outlook remains vulnerable to geopolitical disruptions.
The dollar also retreated from its 18-month high as Treasury yields and oil prices declined. The euro traded at $1.1182, while the Japanese yen stood at 157.97 per dollar.
Tuesday’s market movements exposed the competing forces shaping global asset prices. The AI investment boom continues to support demand for advanced computing, but progress by Chinese chipmakers and warnings about speculative capital flows are forcing investors to reassess the durability of returns. Meanwhile, elevated energy prices, government borrowing, and the prospect of further monetary tightening continue to constrain the broader market outlook.