Equal-weight S&P 500 funds outperform cap-weighted peers as big tech lags
The Invesco S&P 500 Equal Weight ETF (RSP) has surged nearly 16% in 2026, surpassing the cap-weighted S&P 500's 12% gain. The fund crossed $100 billion in assets as investors seek to reduce concentration risk from mega-cap tech stocks. Analysts see room for growth, though liquidity in smaller holdings may become a constraint.
The performance gap stems from structural weighting: cap-weighted funds concentrate holdings in mega-cap tech, while equal-weight funds rebalance quarterly to give each S&P 500 member similar influence. In 2026, several large tech names underperformed the broader sector, while smaller index constituents posted strong gains—benefiting RSP’s diversified approach. The fund’s $100 billion milestone follows over $12 billion in net inflows this year, reflecting investor demand for reduced concentration risk. However, analysts note that as assets grow, trading the smallest holdings becomes less liquid; a quadrupling to roughly $400 billion could strain rebalancing efficiency.
This shift could reshape how retail and institutional investors approach core equity exposure. If equal-weight funds continue to outperform, more savers may diversify away from cap-weighted benchmarks, potentially reducing the market’s outsized reliance on a few tech giants. Yet this trend may also amplify volatility in smaller stocks as inflows grow, and a rebound in mega-cap tech could quickly reverse the gap. Ultimately, investors gain more choice, but must weigh liquidity and sector concentration trade-offs.