A market long dominated by a narrow band of mega-cap technology names is showing signs of redistribution. In a recent Indexology Blog post, Broadening the Base1, Anu Ganti, Head of U.S. Index Investment Strategy at S&P Dow Jones Indices, examines the structural shifts behind the S&P 500's recent performance, and finds that the evidence for genuine breadth expansion is compelling, timely, and consequential for how advisors and investors should be thinking about equity positioning.
The Headline: More Stocks Are Winning
The catalyst for the piece is a data point that deserves attention. Despite renewed geopolitical headwinds pulling equities back near-term, the S&P 500 hit two all-time closing highs last week, supported by softening rate expectations and a strong earnings season. More telling than the index level itself is what is driving it. Ganti notes that "more than 60% of stocks beat the S&P 500 in June and July," a figure that represents a meaningful departure from the concentrated AI-driven leadership that defined much of the prior market cycle. That is not a rounding error. It is a structural signal.
Equal Weight Tells the Story
The S&P 500 Equal Weight Index, which assigns identical weight to all 500 constituents regardless of market capitalization, is the analytical lens Ganti uses to diagnose the breadth story. Equal weight strategies have historically lagged when a handful of mega-caps carry the index. The reversal of that dynamic is therefore significant. The Equal Weight Index outperformed the cap-weighted S&P 500 in June and July, and while it has given back a small portion of that advantage in August, the year-to-date performance picture is instructive at the sector level.
Information Technology is perhaps the most striking example. Ganti observes that "the S&P 500 Equal Weight Information Technology Index outperformed its cap-weighted counterpart by 19% year-to-date," a gap that reflects the diffusion of AI-related investment returns beyond the largest hyperscalers and into mid-sized semiconductor and technology companies. This is a theme the team at S&P DJI has been tracking: the rewards of AI infrastructure spending are moving down the value chain.
Energy has also contributed. The Equal Weight Index carries a structural overweight to the Energy sector, which Ganti notes "outperformed the S&P 500 Ex-Energy by 17% year-to-date," driven by rising crude oil prices tied to ongoing Middle East tensions. The confluence of technology breadth and energy strength is a rare combination, and it has materially supported the equal-weight case.
Earnings as Confirmation
The most persuasive validation of broadening breadth is not index math. It is earnings. Ganti points to the Q2 earnings season as evidence that winner stocks are "no longer housed solely in the Information Technology or Energy sectors." Of the S&P 500 companies that have reported, roughly 85% have beaten analyst estimates, consistent with Q1 results and ahead of the three prior quarters. Health Care, Industrials, and Real Estate have all produced notable outperformers. That kind of broad-based earnings delivery does not happen in a market where only a few names are doing the heavy lifting.
Dispersion: The Signal Inside the Signal
A natural consequence of rising breadth is rising dispersion, and Ganti's analysis here warrants close attention. Dispersion measures the degree to which individual stocks deviate in performance from one another. When dispersion is high, individual security selection and sector allocation carry more consequence. Ganti notes that "S&P 500 dispersion has reached historically high levels," and that the Equal Weight Index has tracked closely with its cap-weighted peer on this measure. The implication is clear: in an environment where stocks are behaving more differently from one another, the structure of a portfolio matters more than it did when a handful of names were pulling everything in one direction.
This is not an environment where passive exposure to a handful of mega-caps provides the coverage it once did. Nor is it one where broad index exposure alone tells the full story.
5 Key Takeaways for Advisors and Investors
1. Breadth is real and data-confirmed. More than 60% of S&P 500 stocks outperformed the index in June and July. That is a market-level signal, not a seasonal fluctuation, and it has been corroborated by earnings data.
2. Equal weight deserves reconsideration. The S&P 500 Equal Weight Index has demonstrated meaningful outperformance in this environment, particularly in Information Technology, where smaller-cap constituents have benefited directly from AI capex diffusion.
3. Sector diversification is being rewarded again. Energy, Health Care, Industrials, and Real Estate have all contributed to market breadth. Concentrated sector exposure, particularly to a narrow set of AI platform names, carries more relative risk than it did during the hyperscaler-dominated phase.
4. Rising dispersion rewards active positioning. When individual stocks diverge significantly in performance, the case for thoughtful sector and security-level differentiation strengthens. Dispersion at historically elevated levels is an environment where structure matters.
5. The AI story is evolving, not ending. The broadening of AI-related returns toward semiconductors and infrastructure providers represents a maturing of the investment thesis, not its conclusion. Advisors should be tracking where value creation is migrating within the AI value chain, not simply whether AI exposure is present in a portfolio.
Footnote:
1 Ganti, Anu. "Broadening the Base." Indexology Blog, S&P Dow Jones Indices, 11 Aug. 2026, https://www.indexologyblog.com/2026/08/11/broadening-the-base/.
