S&P 500 trades at lowest forward valuation since April despite near-record highs

The S&P 500 index is trading at a forward price-to-earnings ratio of 19.4, the lowest level since the tariff-induced sell-off in April 2025, even as the benchmark sits near all-time highs. This valuation compression is driven by earnings growth that has outpaced stock price increases for several of the largest technology companies.

Despite multiple major sell-offs, the S&P 500 has more than doubled since the start of 2023 and is up 13.1% year-to-date. This performance exceeds the index's long-term annual total return average of 9% to 10%. While higher stock prices often signal more expensive valuations, the current market dynamic shows that forward P/E ratios can compress when earnings estimates rise faster than share prices.

Nvidia (NVDA), Alphabet (GOOG, GOOGL), and Amazon (AMZN) illustrate this trend. Nvidia trades at 24.4 times forward earnings, Amazon at 20.1, and Alphabet at 17.2. These figures reflect rising earnings and forward estimates that have grown more quickly than their respective stock prices. These three companies are among the five most valuable in the world, alongside Microsoft (MSFT) and Apple (AAPL). Apple's forward P/E is higher than its mega-cap peers because it has not projected as rapid earnings growth, despite a recent rally. Microsoft's valuation has remained more consistent.

The low index valuation suggests uncertainty regarding whether hyperscalers and chip giants will meet lofty expectations. Amazon and Alphabet are hovering around valuations comparable to the broader index, despite being higher-quality companies than the typical S&P 500 component. The underlying business performance, rather than short-term ticker fluctuations, drives these valuations.

Nvidia reported record profits and high margins in its second-quarter fiscal 2027 results in late August, even with soaring memory chip costs. The company buys memory chips from suppliers to include in its rack-scale data center solutions, which are plug-and-play offerings containing graphics processing units, central processing units, and networking hardware. Nvidia is guiding for a 70% year-over-year increase in fiscal 2028 revenue. Its latest platform, Vera Rubin, began shipments in August with sales visibility extending into fiscal 2028. Nvidia's stock is up 21.9% year-to-date and 38.9% last year, yet its valuation has compressed due to faster earnings growth.

Amazon and Alphabet are reinvesting heavily in artificial intelligence, turning their free cash flow negative to fund compute capacity purchases from companies like Nvidia. Amazon has a history of aggressive reinvestment rather than stock buybacks, while Alphabet has been consistently profitable and used buybacks in the past. Both view AI as a massive opportunity. Hyperscaler margins could increase once capital investments in AI data centers generate revenue.

Chip stocks like Nvidia, Broadcom, and Advanced Micro Devices face risks if top customers reduce spending, but they also benefit from infrastructure upgrades and demand from non-hyperscalers like AI start-ups. Nvidia views the opportunity outside its core hyperscaler base as significant and is partnering with a consortium of financial institutions to raise $500 billion for AI infrastructure.

Valuing stocks based on forward P/E puts pressure on companies to meet high expectations. A slip-up or reduced spending by key customers could deflate valuations. Investors who believe AI spending will yield solid returns may find current valuations compelling, while skeptics may prefer hyperscalers to return to capital-light models before buying.