AI spending has moved from market darling to market liability. The Nasdaq Composite fell 2.9% Friday, its largest one-day percentage decline since June 5, as disappointing results from Amazon and Intel sharpened investor concerns over the cost and sustainability of artificial-intelligence infrastructure.

The damage was not confined to U.S. technology shares. The S&P/TSX Composite Index dropped 1.74% on the same day, showing how quickly a technology-led repricing can cross the border and pressure momentum and growth-oriented equities in both markets. This was not merely a bad session for a narrow group of companies; it was a broader challenge to the assumptions supporting the AI trade.

For traders, the most important figure may be the Nasdaq’s distance from its peak. The index is now 7.8% below its all-time closing high reached on October 6. That decline puts recent weakness into a more consequential frame: enthusiasm has given way to questions about whether the enormous capital required to build AI infrastructure can produce returns on a timetable investors will accept.

Results Put the AI Bill in Focus

Amazon and Intel helped bring that debate into the open. Their disappointing results intensified concerns about AI infrastructure spending, particularly the financing and operating costs attached to the buildout. The market’s response suggests investors are becoming less willing to treat every AI-related expenditure as an unquestioned engine of future growth.

That is a meaningful shift in market psychology. In the earlier phase of the AI rally, spending could be interpreted as evidence of competitive ambition. Now, the same spending may prompt a harder question: how much capital must be committed before the commercial payoff becomes visible?

The answer matters well beyond Amazon and Intel. Large technology companies, suppliers and growth stocks are valued partly on expectations of future expansion. When investors begin to challenge the durability of those expectations, high-momentum areas can face pressure even without a single dramatic change in the long-term technology story.

Cross-Border Pressure

The 1.74% decline in the S&P/TSX Composite Index underscores the Canadian implications. Canada’s market is not a mirror image of the Nasdaq, but cross-border capital flows connect the two. When U.S. technology leadership weakens, portfolios with exposure to momentum and growth can feel the effect across North American exchanges.

That connection is especially relevant for traders watching technology-linked names and other equities priced on expansion expectations. A retreat in the Nasdaq can reduce the appetite for risk more broadly, while the pressure on the TSX indicates that the session’s message was not restricted to Silicon Valley. The market may be reassessing the price of growth wherever that growth depends on continued optimism and substantial investment.

Overnight foreign-exchange commentary added another layer to the story, characterizing the Nasdaq’s monthly performance as its weakest since March 2025. That description places Friday’s decline inside a sustained deterioration rather than treating it as an isolated shock. The market is now dealing with both the immediate disappointment in corporate results and the broader question of whether AI infrastructure spending can remain the dominant justification for elevated growth expectations.

The Trader’s Bottom Line

The cross-border selloff suggests a change in the burden of proof. Technology companies may still have powerful opportunities ahead, but investors appear to be demanding clearer evidence that infrastructure costs can be supported by durable returns. Until that evidence emerges, disappointing results may carry more weight than optimistic long-term projections.

For U.S. and Canadian markets, the Nasdaq’s 2.9% slide and the TSX’s 1.74% decline are a reminder that leadership can reverse quickly when a popular theme encounters financial scrutiny. The next phase of trading may be defined less by the promise of AI than by the discipline of paying for it.

Read the market report on the Nasdaq, Amazon and Intel, alongside the overnight market wrap.