The market is riding high on an AI spending boom - but what could crack this rally?

The stock market is riding high on an AI spending boom, with earnings growth reported by firms surpassing analysts' expectations, but the rally is highly concentrated in a few stocks. The fate of the stock market is heavily leveraged to the continued growth of corporate profits and AI-related spending.
The stock market has reached record highs as investors focus on an artificial-intelligence spending boom, with Wall Street analysts raising their expectations for corporate profits in 2026. The S&P 500, Nasdaq Composite, and Russell 2000 indexes all closed at record highs, with the S&P 500 and Nasdaq posting their largest five-week percentage gains since 2020. Earnings growth has been concentrated in stocks with strong ties to the AI trade, particularly the 'Magnificent Seven' and semiconductor names. For the rally to continue, companies will face a high bar for corporate profit growth to meet or exceed analysts' expectations. The market's biggest vulnerability is that earnings momentum will continue to improve and AI-related spending will pay off. If the conflict in the Middle East escalates, it could push up bond yields and dent corporate profits.
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