Equal-Weight ETF Strategy: Pros and Cons
Equal weighting hands the smallest S&P 500 company the same stake as Apple. That cuts mega-cap concentration and tilts toward smaller, cheaper stocks — at a price.
Don't have time? Here's what you need to know:
- 1Equal-weight funds like RSP hold the same S&P 500 stocks but give each roughly 0.2%, cutting top-10 concentration from about a third of the fund to around 2%.
- 2The approach creates a built-in tilt toward smaller, cheaper stocks and a contrarian quarterly rebalance that trims winners and buys laggards.
- 3RSP costs about 0.20% versus VOO's 0.03% and tends to lag in concentrated mega-cap bull markets while leading when market breadth is wider.
- 4Equal weight is a deliberate anti-concentration, pro-size-and-value bet — best for investors uneasy about mega-cap dominance, not those seeking the cheapest market exposure.
One Index, Two Very Different Funds
The standard S&P 500 is weighted by market capitalization: the biggest companies get the biggest slice, so a handful of mega-cap technology names can make up a third or more of the entire index. An equal-weight version holds the same 500 companies but gives each one the same weight — roughly 0.2% apiece — regardless of size. The largest company and the smallest get identical stakes.
The most popular equal-weight fund is RSP, which tracks the equal-weighted S&P 500. Owning RSP instead of VOO is a meaningful active decision dressed up as a small tweak: you are deliberately underweighting the giants and overweighting the smaller, often cheaper members of the same index. The result behaves quite differently from the cap-weighted version.
What Equal Weighting Does to Your Exposure
Equal weighting changes your portfolio in three ways. It slashes concentration: instead of a third of your money riding on a few mega-caps, no single stock dominates. It introduces a built-in size and value tilt, because giving small companies the same weight as giants effectively overweights smaller, cheaper stocks relative to the cap-weighted index. And it forces a contrarian rebalancing discipline — to stay equal-weighted, the fund must regularly trim winners and add to laggards.
Those tilts explain RSP's track record relative to VOO. When mega-cap leadership dominates — as in the late 2010s and early 2020s — equal weight tends to lag, because it deliberately underweights the very stocks driving the market. When market breadth is wider and smaller or value stocks lead, equal weight has often pulled ahead. It is essentially a bet against extreme concentration.
| VOO (cap-weighted) | RSP (equal-weight) | |
|---|---|---|
| Largest holding weight | Several percent each | ~0.2% each |
| Top-10 concentration | Roughly a third of the fund | About 2% combined |
| Built-in tilt | Toward mega-caps | Toward smaller / value names |
| Expense ratio | ~0.03% | ~0.20% |
| Rebalancing | Minimal | Quarterly, contrarian |
The Costs Equal Weight Carries
Equal weighting is not free. RSP charges around 0.20% versus roughly 0.03% for VOO — a real, recurring gap of about 0.17% a year. The quarterly rebalancing needed to reset every position back to equal also generates turnover, which adds trading costs and, in a taxable account, more taxable events than a buy-and-hold cap-weighted fund. Equal weight is therefore generally more at home in a tax-advantaged account.
There is also a behavioral cost: equal weight can underperform the headline S&P 500 for years during concentrated mega-cap bull markets, and watching your 'S&P 500 fund' trail the index you read about in the news is a real test of conviction. The strategy only rewards investors who understand they are making a deliberate anti-concentration, pro-size-and-value bet and can hold it through the stretches when concentration wins.
Important: Equal weight is not a free upgrade to the S&P 500. It is a deliberate tilt that can lag the cap-weighted index for years whenever a few mega-caps dominate.
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Who Equal Weight Is For
Equal weight suits investors who are specifically uneasy about concentration — those who look at a cap-weighted index with a third of its money in a few names and want broader exposure to the same 500 companies. It is also a clean, transparent way to add a modest size-and-value tilt without leaving large-cap U.S. stocks. As a partial holding alongside a cap-weighted core, it can diversify your sources of return.
It is a poorer fit for investors who simply want the lowest-cost market exposure and the index's headline return — VOO or VTI does that better and cheaper. The decision comes down to a single question: do you want to own the market as it is, mega-caps and all, or do you want to deliberately bet that today's concentration will eventually unwind? Equal weight is the second choice, with the higher fee that bet costs.
Frequently Asked Questions
What does equal weighting actually change?
It gives every stock in the index the same weight instead of weighting by size. In the S&P 500, that drops each holding to roughly 0.2% and cuts the top-10 concentration from about a third of the fund to around 2%. The effect is a built-in tilt toward smaller, cheaper companies and far less reliance on a few mega-caps.
Is RSP better than VOO?
Neither is universally better — they are different bets. RSP (equal weight) reduces concentration and tilts toward smaller, value-leaning stocks but costs about 0.20% and can lag when mega-caps dominate. VOO (cap weight) is cheaper at about 0.03% and simply owns the market as it is. RSP tends to win in broad markets, VOO in concentrated ones.
Why is RSP more expensive than VOO?
Two reasons. RSP's strategy requires quarterly rebalancing to reset every position back to equal weight, which adds turnover and cost. And as a strategy-index fund rather than a plain cap-weighted one, it commands a higher fee — around 0.20% versus VOO's 0.03%. That 0.17% annual gap is a real hurdle the strategy must overcome.
Does equal weight reduce risk?
It reduces single-stock concentration risk — no mega-cap can dominate your returns. But it adds a tilt toward smaller, often more volatile companies, so overall volatility is not necessarily lower. Equal weight changes the kind of risk you take rather than simply lowering it; it is a bet against concentration, not a low-risk strategy.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.