Equal-Weight S&P 500 Takes Center Stage as Market Broadening Shifts Investor Focus Beyond Mega-Cap Dominance

Traders celebrated at the New York Stock Exchange on April 15, 2026, as the S&P 500 closed above the 7,000 level for the first time.

NYSE

Equal-weight ETFs are experiencing a surge in popularity. While the strategy is not new, it has gained significant traction this year as many of the large-cap stocks that previously drove a disproportionate share of core stock market index performance have begun to lag. By allocating to equal-weight ETFs—which assign the same weight to every company in the underlying index rather than mirroring market-capitalization-weighted benchmarks—investors can maintain broad market exposure while mitigating concerns around concentration risk.

The Invesco S&P 500 Equal Weight ETF (RSP), the oldest, largest, and most widely recognized ETF employing this approach, leads a relatively small group of approximately 30 equal-weight ETFs that span broad market indexes as well as specific sectors. The fund has attracted over $12 billion inflows this year, pushing assets under management past $100 billion for the first time while outperforming its market-weighted counterpart, the S&P 500, by roughly 3% year-to-date through August 21.

“All of a sudden, people are paying attention,” said Cinthia Murphy, director of research at VettaFi, highlighting that the equal-weight strategy often fades from view when the market is dominated by a narrow theme, as was the case in recent years when the Magnificent 7 delivered outsized returns.

The Mag 7—a cohort of mega-cap U.S. technology and growth companies comprising Alphabet, Amazon, Apple, Meta, Microsoft, Nvidia, and Tesla—collectively represent about one-third of the S&P 500. These firms dominated the U.S. market for years. However, their momentum has cooled recently as heavy AI-related capital expenditures have weighed on investor sentiment. In the first half of 2026, the Mag 7 posted flat returns compared to the S&P 500’s 9.3% gain.

Performance of the Equal-Weight S&P 500 Index as measured by the RSP ETF vs. the Market-Weight S&P 500 Index as measured by the IVV ETF in 2026.

“Investors have grown increasingly concerned about the concentration risk embedded in major indices such as the S&P 500, where the top 10 names account for nearly 40% of the index. This exposure is particularly concentrated in the AI theme and the major hyperscalers, where investors are raising questions about elevated valuations and whether the heavy capital spending will ultimately be justified,” said Nathan Geraci, president of NovaDius. “At the same time, market performance has broadened beyond the mega-cap names, with a wider range of sectors and market segments participating in the rally. Equal weighting addresses the challenge of concentration risk and enables investors to participate more fully if market leadership continues to diversify,” he added.

Despite strong inflows, RSP and its peers still have considerable ground to make up against the dominant trio of S&P 500 funds. The largest ETFs in existence—the Vanguard S&P 500 ETF (VOO), the iShares Core S&P 500 ETF (IVV), and the State Street SPDR S&P 500 Trust (SPY)—manage nearly $3 trillion in combined assets, with VOO alone holding approximately $1 trillion.

However, more investors are embracing equal-weight and smart-beta strategies, using them both as tactical plays to capitalize on shifting market dynamics and as long-term tools to remain diversified and fully invested in the broader market, according to Murphy. “The market has been discussing the need to diversify away from the Mag 7 for years, and now we’re seeing that approach pay off. It’s no longer solely about the Mag 7. Other stocks are catching up, earnings growth remains robust among the other 493 constituents of the S&P 500, and future earnings projections for those companies are strong. This environment supports equal weighting,” she explained. “With equal weighting, investors achieve consistent diversification. Rather than backing one winner, they’re essentially betting on the entire field.”

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