US stock markets declined on the 17th (local time) as semiconductor stocks faced heavy selling pressure. The Dow Jones Industrial Average fell 406.55 points (0.77%) to close at 52,146.42, the S&P 500 dropped 76.08 points (1.01%) to 7,457.69, and the Nasdaq Composite declined 361.70 points (1.40%) to 25,520.24. The sell-off was driven by concerns over whether massive AI infrastructure investments will yield returns and intensifying competition from Chinese AI models. The Philadelphia Semiconductor Index entered bear market territory, falling 20% from its peak on the 22nd of last month.
Major US Stock Indices Post Broad Declines on the 17th
On the 17th at the New York Stock Exchange, the Dow Jones Industrial Average closed 406.55 points (0.77%) lower at 52,146.42. The S&P 500 fell 76.08 points (1.01%) to 7,457.69, while the technology-heavy Nasdaq Composite declined 361.70 points (1.40%) to 25,520.24.
On a weekly basis, the S&P 500 dropped 1.6% and the Nasdaq fell 2.9%. The Philadelphia Semiconductor Index declined 1.63% on the 17th, marking its third consecutive day of losses.
Philadelphia Semiconductor Index Enters Bear Market Territory
The Philadelphia Semiconductor Index entered bear market territory after falling 20% from its peak of 14,634.72 (closing basis) reached on the 22nd of last month.
Nvidia declined 2.21%, while Micron fell 0.5%, AMD dropped 1.03%, and Intel decreased 2.0%. SK Hynix American Depositary Receipts (ADR) rebounded 1.13%.
The memory semiconductor sector led the stock market rally in the second quarter, but concerns about whether massive AI infrastructure investments will bear fruit have triggered profit-taking sell-offs.
Taiwan's TSMC recorded surprise earnings in the second quarter that significantly exceeded market expectations, driven by surging AI semiconductor demand. However, the market maintains skepticism about whether the memory semiconductor bull cycle can continue long-term.
Chinese AI Model Competition Pressures US Tech Stocks
Chinese AI startup Moonshot AI's latest AI model "Kimi K3," released for free, has demonstrated strong performance and is narrowing the gap with top models from OpenAI and Anthropic. This development has cast a shadow over the profitability outlook for major US AI companies.
Wall Street experts analyze that companies may prefer developing their own customized AI models based on Chinese open-source models rather than paying expensive fees to use closed AI models from OpenAI or Anthropic.
Earlier, in early last year, Chinese AI startup DeepSeek launched a powerful AI model at low cost, shaking the stock prices of major AI-related companies including Nvidia.
David Morrison, senior market analyst at Trade Nation, stated: "While earnings and demand trends remain solid, recent profit-taking suggests some investors are beginning to question how much longer the current growth pace can be sustained."
FAQ
What caused US stocks to decline on the 17th?
US stock markets fell on the 17th (local time) due to heavy selling pressure in semiconductor stocks. The Dow Jones Industrial Average dropped 406.55 points (0.77%), the S&P 500 fell 76.08 points (1.01%), and the Nasdaq declined 361.70 points (1.40%). The sell-off was driven by concerns over AI infrastructure investment returns and competition from Chinese AI models.
Why did the Philadelphia Semiconductor Index enter bear market territory?
The Philadelphia Semiconductor Index fell 20% from its peak of 14,634.72 reached on the 22nd of last month, entering bear market territory. The index declined 1.63% on the 17th, marking three consecutive days of losses. Major semiconductor stocks including Nvidia (down 2.21%), Intel (down 2.0%), and AMD (down 1.03%) all posted declines.
