US equities closed sharply lower on Thursday, 5 November 2026, as selling in semiconductor and artificial-intelligence infrastructure shares spread into the wider market. The Nasdaq Composite lost 5.5% to 24,315, the S&P 500 fell 4.4% to 7,353.73, the Dow Jones Industrial Average dropped 3.4% to 51,523.06, and the Russell 2000 fell 4.4% to 2,729.89, according to Associated Press US closing-index figures.

Those are 5 November US closing levels, not current or pre-market quotes. Reuters' separate closing report listed precise falls of 4.36% for the S&P 500, 5.52% for the Nasdaq and 3.44% for the Dow. The difference from AP's one-decimal percentages reflects rounding, not competing closes. Reuters market report.

AI infrastructure moves from growth story to policy risk

The decline was concentrated in stocks linked to chips, cloud infrastructure and the buildout of data centres. Reuters reported pressure on semiconductor businesses, including Nvidia, AMD and other hardware suppliers, and flagged concerns that political opposition to new data centres could slow the investment pipeline.

Investors were also digesting the aftermath of the US midterm elections. The prospect of tighter data-centre rules and permitting restrictions featured in market commentary following Democratic gains in Congress. That is a reported investor concern, not proof that legislation has passed or that every stock fall was caused by a particular policy.

Why the distinction between the indices matters

The Nasdaq Composite's heavier technology weighting made it particularly exposed to weakness in AI-linked companies. The S&P 500 captures a broader range of US large-cap businesses. The Russell 2000's fall showed the retreat was not confined to a handful of giant technology names, even though the heaviest selling originated in that area.

The session reversed the prior day's post-election rise. The speed of the two-day change illustrates how quickly markets can reprice expectations about growth spending, future regulation and the cost of capital. An index fall alone does not establish a recession, a sustained bear market or a direct causal effect on Bitcoin, gold or the dollar.

NetNapz assessment: what to monitor next

NetNapz assessment: Watch for company guidance on AI capital expenditure, the actual text and timing of any data-centre restrictions, upcoming US economic releases, and evidence of whether selling broadens further beyond AI suppliers. A confirmed change to permitted construction or procurement would be more consequential than speculation about future rules.

Verification: US closing levels and rounded changes are from AP's 5 November index close; market context and more precise percentage changes were cross-checked with Reuters. This report contains no unverified real-time share prices, trading advice or claims about future market direction.