S&P 500 sets another record as the Magnificent Seven recover, while Goldman Sachs warns of froth

What this means

Equities are being valued as if the 30-year Treasury did not yield nearly 5.7%. That leaves a thin margin between the return on stocks and the return on long-term government debt. The rally is concentrated in a few AI platforms whose capital spending increasingly relies on debt, so higher yields raise the return those projects must earn. Index funds, passive retirement savers and markets outside the US with large AI hardware weightings are most exposed. The Paramount bond drop is a small but direct sign that credit investors price leverage more harshly than equity investors do. The precedent is 1999–2000, when tech-led equity highs coincided with rising yields and the gap between the leaders and the rest of the market widened before the peak. The desk's read: over the next several weeks, the index will likely depend on third-quarter results and spending guidance from the largest AI spenders. If those results show capital spending growing faster than operating cash flow while yields stay near current levels, a correlated pullback in the megacaps is the likelier outcome. Broader participation by the rest of the index, or a sustained fall in long-term yields, would prove that read wrong.