Key takeaways
- S&P 500 and Nasdaq decline as chipmakers slide
- Micron falls nearly 6% amid Chinese competition concerns
- Strong bank earnings prevent a broader market selloff
The U.S. stock market fell on Tuesday, October 13, as renewed selling in artificial intelligence stocks dragged down the S&P 500 and Nasdaq Composite following a sharp technology rout across Asia.
The S&P 500 declined approximately 0.1%, while the Nasdaq lost 0.4% during the session. Meanwhile, the Dow Jones Industrial Average gained around 300 points, or 0.6%, supported by stronger earnings from major financial and healthcare companies.
The divergence highlights growing concerns about AI valuations, semiconductor competition and whether enormous investments in computing infrastructure will generate sufficient returns.
Why Are the S&P 500 and Nasdaq Falling Today?
Semiconductor stocks led the latest market decline, extending losses that began earlier this week.
Micron Technology shares fell approximately 5.8%, while Nvidia declined 1.3% and AMD lost 3.3% during Tuesday's trading. Broadcom also slipped 1.3%, reflecting widespread pressure on companies exposed to AI infrastructure spending.
The weakness follows growing concerns about China's ChangXin Memory Technologies, which recently announced progress in developing more advanced memory chips.
Investors worry that increased Chinese competition could threaten the pricing power of established semiconductor suppliers, particularly companies benefiting from the surge in AI server demand.
The latest Micron stock decline extends Monday's losses, when Chinese memory technology developments first weighed heavily on U.S. chipmakers.
Broadcom CEO's AI Warning Adds to Market Concerns
The selloff also followed comments from Broadcom CEO Hock Tan, who compared speculative investing in artificial intelligence to casino gambling.
Speaking at a technology event in Singapore, Tan warned that investors were committing capital to AI businesses without fully understanding their financial prospects.
His remarks added to existing concerns about whether massive infrastructure investments can deliver the profitability currently reflected in technology valuations.
Those fears have already contributed to a broader AI stock selloff, with all 30 Philadelphia Semiconductor Index constituents declining during Monday's session.
Asian markets experienced particularly severe losses on Tuesday, with Samsung Electronics falling 7.4% and SK Hynix losing approximately 10%.
Why Is the Dow Jones Rising While Nasdaq Falls?
Despite weakness in technology stocks, other sectors provided support for the broader market.
Goldman Sachs shares rose after stronger-than-expected quarterly earnings, while JPMorgan also advanced. UnitedHealth gained approximately 2.6%, helping offset losses elsewhere.
This contrast demonstrates how market concentration can produce sharply different outcomes across major U.S. indices.
