The Invesco S&P 500 Equal Weight ETF (NYSEMKT: RSP) is quietly outpacing the broader market, gaining 16% year to date compared to the S&P 500’s (SNPINDEX: ^GSPC) 13% return.
The secret behind RSP’s edge lies in its construction, which treats every S&P 500 stock identically regardless of market capitalization.
While the traditional S&P 500 is market-cap weighted, the equal-weight version gives Nvidia (NASDAQ: NVDA) the same influence as Domino’s Pizza (NYSE: DPZ) or Clorox (NYSE: CLX).
Nvidia carries a $5.5 trillion market cap, while Domino’s sits at just $11 billion, yet both receive identical weighting inside the equal-weight index.
This structural difference has profound implications depending on which segment of the market is driving gains at any given time.
In bull markets dominated by a handful of mega-cap companies, as seen from 2023 through 2025 with AI stocks, the cap-weighted S&P 500 tends to outperform its equal-weight counterpart.
However, when the rally broadens across more sectors and smaller companies, the equal-weight index gains the upper hand, which is precisely what is happening in 2026.
The so-called Magnificent Seven stocks that powered markets in recent years have collectively underperformed the S&P 500 so far this year, signaling a meaningful rotation underway.
Sectors like financials and materials, which have historically been underweighted in cap-weighted indexes relative to their growth potential, are now presenting strong investment opportunities.
The top eight companies in the traditional S&P 500 still account for nearly 36% of the index’s cumulative weight, and all are closely tied to artificial intelligence spending.
If concerns about AI overspending begin appearing in the income statements, revenue growth, or management commentary of megacap companies, the cap-weighted index faces outsized risk.
That scenario would weigh disproportionately on the large tech stocks that dominate the standard S&P 500, once again favoring the equal-weight approach.
The equal-weight index is rebalanced quarterly, coinciding with when the S&P 500 adds and removes constituents, keeping exposure fresh and diversified across the full index.
Investing in RSP allows investors to maintain meaningful exposure to leading AI names while simultaneously capturing upside from undervalued companies across the broader index.
The combination of broader market participation, lower concentration risk, and reduced volatility makes RSP a compelling consideration for portfolios heading into the remainder of 2026.
