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Market-cap-weighted funds give larger companies more influence; equal-weighted funds target the same allocation for every company in an index. That changes a fund’s concentration and rebalancing needs, but it does not make either approach automatically better or less risky. The S&P 500 offers a clear example: its equal-weight version holds the same constituent companies as the standard S&P 500, but targets 0.2% per company at each quarterly rebalance.
How the two weighting methods work
An index sets rules for which securities it includes and how much each one counts. A fund that tracks the index is an investment vehicle; investors buy shares of the fund, not the index itself.
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Market-cap weighting
In a market-cap-weighted index, a company’s weight is proportional to its market capitalization. Many equity indexes use a float adjustment, which excludes shares not readily available for public trading. As a result, larger companies usually have more influence on the index’s movements. S&P Dow Jones Indices’ explanation of index weighting methods describes both market-cap and float-adjusted approaches.
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Equal weighting
An equal-weighted index assigns each constituent the same target weight, regardless of company size. In the S&P 500 Equal Weight Index, the target is 0.2% for each company at each quarterly rebalance. That figure applies to this index: the target percentage in another equal-weight index depends on how many constituents it contains.
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What changes in an S&P 500 comparison
The standard S&P 500 and its equal-weight version use the same constituent companies, according to S&P Dow Jones Indices. The difference is how much each company counts: the standard index weights companies by market capitalization, while the equal-weight version gives every constituent the same target allocation at the quarterly reset. S&P’s index page describes the equal-weight benchmark.
Equal weighting reduces the largest companies’ relative influence within that shared group and raises the relative influence of smaller constituents. It changes the portfolio’s exposures; it does not guarantee higher returns, lower overall risk, or protection from a market decline.
Why equal-weight funds rebalance
After a rebalance, price changes cause equal-weighted holdings to drift away from their target weights. A constituent whose price rises faster than others becomes a larger share of the portfolio; one that lags becomes a smaller share. The index’s next rebalance resets weights to its target. S&P’s example rebalances quarterly. S&P’s index mathematics methodology explains how price movements affect weights.
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How to compare funds tracking the indexes
Weighting is only one part of the choice. Compare the actual funds and their rules rather than relying on labels alone.
- Index universe and constituent rules: Check what the index holds, how it selects and removes constituents, and whether the funds being compared track the same universe. Equal weighting does not necessarily mean the same companies as a different cap-weighted index.
- Concentration and exposure: Review how much influence the largest holdings have and how the fund allocates to smaller constituents. Equal weighting changes those relative exposures; it is not a guarantee about total portfolio risk.
- Rebalancing and turnover: Check how often the index resets weights and review the fund’s reported turnover. Rebalancing frequency alone does not tell you the resulting trading activity.
- Costs and tracking: Compare current expense ratios, brokerage costs, and tracking difference—the gap between a fund’s performance and its benchmark. An expense ratio is not the only cost, and issuer figures can change.
- Taxes: Consider the tax treatment of fund distributions and trading in your account and jurisdiction. The relevant rules depend on where you invest and the type of account; an index label does not determine your tax outcome.
Example: Invesco’s equal-weight S&P 500 ETF
Invesco identifies its S&P 500 Equal Weight ETF (RSP) as seeking to track the S&P 500 Equal Weight Index. Its product page states quarterly rebalancing and a 0.20% total expense ratio. These are issuer-provided figures, not a comparison with every cap-weighted alternative, and fund expenses can change. Check the current RSP product information and prospectus for current terms. RSP is one implementation example, not a recommendation or the only fund that may track an equal-weight index.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can you tell which approach performed better?
There is no supported, matched return comparison here that establishes a current winner. A meaningful comparison needs the exact indexes or funds, the same start and end dates, a total-return basis, and a clear statement about whether returns are before or after fees. Fund results also reflect expenses and tracking difference; an index comparison does not capture every cost an investor pays.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteCheck whether an index’s history is live or hypothetical. S&P Dow Jones Indices warns that data before an index launch may be back-tested, with limitations that can include hindsight and survivorship or look-ahead bias; past performance does not guarantee future results. Its equal-weight index information sets out these performance caveats.
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