The S&P 500 remains one of the most widely held investments in the world, but its market-cap weighting structure has created a significant concentration problem for investors.
Because the index weights companies by market capitalisation, years of enormous gains in megacap technology stocks have pushed the index’s biggest names to historically outsized positions.
Today, roughly 37% of the Vanguard S&P 500 ETF (VOO) is concentrated in just its top 10 holdings, a level of concentration rarely seen throughout the index’s long history.
Nvidia and Apple alone account for around 14% of the S&P 500, and adding Microsoft and Alphabet pushes that figure to more than 25% tied to just four major tech companies.
An investor buying an S&P 500 ETF today isn’t making the same investment someone made 10 to 20 years ago, given how dramatically the index’s composition has shifted toward its largest names.
The Invesco S&P 500 Equal Weight ETF (RSP) offers a direct solution to this problem by owning the same 500 companies while assigning each component an equal share of the portfolio.
At the time of rebalancing, that means Nvidia, Microsoft, Apple, and the rest of the Magnificent Seven each receive a roughly 0.2% weighting, dramatically reducing megacap concentration risk.
RSP’s current top sector holdings are industrials, financials, tech, and healthcare, with each of those sectors receiving at least a 12% allocation, reflecting a more balanced exposure across the economy.
In 2026, a visible rotation out of the Magnificent Seven stocks has already taken hold, with RSP outperforming VOO by nearly 4% year-to-date as a result of that shift.
Several macroeconomic forces are supporting the case for this rotation to continue, including inflation remaining well above target, the possibility of multiple Federal Reserve interest rate increases before year-end, and a labor market showing signs of slowing.
Investors paying closer attention to valuations in this environment may find equal-weight exposure a more attractive way to maintain broad index participation without the heavy dependence on a handful of tech giants.
The trade-off with RSP has historically been its underweighting of tech, meaning the fund is likely to lag a traditional cap-weighted S&P 500 ETF if megacap giants resume market leadership.
For investors who believe the current rotation is more than a short-term trend, RSP presents a way to stay invested in S&P 500 companies while meaningfully spreading risk across a wider range of industries and sectors.
