The S&P 500 Is Near an All-Time High but Trading at Its Lowest Valuation in a Year. Nvidia, Alphabet, and Amazon Help Explain Why.

The S&P 500 sits near an all-time high with a 13.1% year-to-date gain, yet it trades at a forward P/E of 19.4, its lowest valuation in a year. Price strength and cheapening multiples are arriving together.

The explanation, per the source, lies in the mega-cap growth names. Nvidia (NVDA), Alphabet (GOOGL), and Amazon (AMZN) have become cheaper on forward earnings because their earnings growth is outpacing their stock price gains. When the "E" in P/E rises faster than the "P," the multiple compresses even as the shares climb.

These companies are also spending heavily on AI infrastructure. The source argues that margins could expand meaningfully once those capital investments begin generating returns. That is a forward-looking thesis, not a realized result: the payoff depends on spending converting into revenue.

Interpretation: a 19.4 forward multiple at index highs suggests the rally has been backed by earnings expectations rather than pure multiple expansion. That reading is ours, drawn from the supplied figures, not a claim made by the source.