iShares MSCI USA Equal Weighted ETF (EUSA)

The iShares MSCI USA Equal Weighted ETF (EUSA) holds the same American stocks as a traditional market-cap-weighted index, but with a twist: each stock gets an identical weight in the portfolio. If the index contains six hundred stocks, each one represents a six-hundredth of the fund. That simple change creates enormous consequences for how the fund behaves.

A market-cap-weighted index, like the S&P 500, gives larger weights to larger companies. Apple, Microsoft, and Nvidia—the three largest firms—make up a fifth or more of the index. In contrast, EUSA gives each stock, regardless of size, one equal slice. This means EUSA systematically overweights smaller companies and underweights megacap giants. It is not a small-cap fund; it is a full-market fund with a small-cap lean.

The intellectual case for equal weighting rests on a simple observation: in a market-cap-weighted index, the largest, most-expensive stocks get the most weight. If those stocks are overvalued and the smallest, cheapest stocks are undervalued, then equal weighting captures a value premium by tilting toward the latter. Over long stretches, value stocks have outperformed growth stocks, and EUSA was designed to capture that advantage systematically. It has also accumulated a secondary tilt toward cyclical sectors like financials and industrials, which tend to be smaller and cheaper than technology.

The structure of equal weighting creates a constant tension. As stocks perform differently, the fund drifts out of balance. A stock that has surged in price becomes overweight; a stock that has fallen becomes underweight. To maintain true equal weighting, EUSA must rebalance regularly—selling the winners and buying the losers. This is the opposite of the buy-and-hold mentality; it is a disciplined commitment to “sell high, buy low” at the index level.

Rebalancing is costly. Every trade incurs a small spread, and in large funds with billions of dollars, shifting that capital to rebalance incurs opportunity costs and market impacts. The fund’s expense ratio runs around 20 basis points per year, which is a touch higher than market-cap-weighted rivals, and the rebalancing drag can cost an additional few basis points per year depending on market conditions.

Over the past two decades, EUSA has delivered returns that are largely in line with the broad US market, sometimes outperforming, sometimes lagging. In years when small stocks and value stocks have done well, EUSA outperforms the S&P 500. In years when megacap growth stocks have dominated—as they did in 2017, 2019, and 2023—EUSA has lagged considerably. This performance pattern is not a bug; it is precisely what the equal-weighting structure delivers.

The cyclicality of equal weighting is pronounced. In bull markets, investors favor large, proven winners, and market-cap weighting pulls further and further into the mega-cap names. In bear markets, when investors flee growth and seek stability, the smaller, cheaper stocks can lag initially, but as sentiment recovers, they can catch up and outpace. In sideways markets with high volatility, EUSA’s rebalancing discipline—selling strength, buying weakness—can create an edge.

During periods of economic strength and low volatility, like the early 2010s or the 2017 mega-cap rally, equal weighting has trailed. During periods of rotation and volatility, like 2016 or 2021-2022, it has outperformed. This is the rhythm of the equal-weighting strategy: it waits patiently for rotations and volatility to reward the rebalancing discipline, and it suffers patiently during long runs of mega-cap outperformance.

EUSA’s constituency is highly relevant to its behaviour. It includes all large and mid-cap US stocks in the MSCI universe, plus many smaller names. The largest components—which still represent only a sixth of a percent of the fund each after rebalancing—span every sector: banks and insurance firms are overweight relative to market-cap weighting, as are energy companies and commodity producers. Technology is underweight. This is a broad, diversified fund, but with a clear tilt toward cyclical, value-oriented stocks.

One subtle advantage of equal weighting is that it sidesteps the concentration risk of market-cap weighting. If the US market becomes heavily concentrated in a handful of mega-cap technology firms, EUSA is automatically hedged against that concentration. If those firms stumble, EUSA suffers less. If they surge, EUSA benefits less. This may sound like a drawback, but over long periods, it has proven to be a stabilizing force.

The costs and drags of rebalancing are real, and they mean EUSA is not the lowest-cost way to own the US market. For an investor seeking the cheapest possible exposure, a market-cap-weighted index ETF at 3 to 5 basis points is unbeatable. But for an investor who believes that rebalancing discipline and a small-stock tilt can add value over a decade or more, EUSA offers a structured, transparent way to implement that belief. It is most useful for investors who are genuinely convinced that smaller stocks will outperform over their holding period and who are comfortable with the volatility that comes from that bet.

EUSA is not a hedge or a tactical allocation. It is a long-term strategic position, a permanent tilt toward value and cyclicality rather than growth and mega-cap momentum. In that role, it has delivered reasonable returns with a different risk and return profile than the S&P 500—sometimes better, sometimes worse, always with the philosophical coherence of equal weighting.