📌 U.S. Equity Breadth and Earnings Concentration Are Expanding Simultaneously

The market narrative of “strong indexes, weak breadth, and reliance on a handful of heavily weighted technology stocks” has recently encountered structural counterevidence. The second and third quarters of presidential midterm years have historically been the weakest phase of the four-year cycle, yet this market is displaying unusually strong breadth: excluding utilities, all sectors rose on both market-cap-weighted and equal-weighted bases; the S&P 500 gained 18%, the Nasdaq rose 24%, and the technology sector climbed 40%. This means the advance is not being driven solely by a small number of heavyweight stocks, but rather reflects broad participation across most sectors.

At the same time, earnings concentration is also peaking and declining. The “Magnificent Seven” share of S&P 500 earnings began to fall after reaching 28.4% in the first quarter of 2026, despite Nvidia substantially raising guidance and continuing to increase its own weighting. The timing of this ratio’s peak broadly coincides with the peak in the “Magnificent Seven’s” relative performance.

The simultaneous expansion of price breadth and earnings sources indicates that market leadership is extending outward from a small group of large technology stocks. Concentration risk has not disappeared, but the current market can no longer be characterized solely as being “supported by a handful of technology stocks.” Going forward, it will be necessary to observe whether this expansion can persist and whether earnings growth is truly being transmitted to other sectors.

▌ Sources

• Unusually strong sector breadth in a midterm year by JC_ParetsX
• Magnificent Seven earnings share peaks and declines by GinaMartinAdams