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The standard S&P 500 gives the biggest companies the most influence; the equal-weight version gives each constituent roughly the same weight at quarterly rebalances. Choose the standard index if you want large-cap U.S. exposure weighted by company size. Consider equal weight if you deliberately want to reduce the largest firms’ influence and accept different company-size, sector, and factor exposures. Neither weighting method is a dependable performance winner.
How do the two indexes differ?
Both indexes draw from the S&P 500 constituent set, but their weighting rules produce different portfolios. The standard S&P 500 is weighted by float-adjusted market capitalization: companies with more publicly available shares and larger market values receive more weight. In the equal-weight index, each constituent is reset to approximately 0.2% at each quarterly rebalance. S&P Dow Jones Indices describes the latter as a different lens on market performance in its FAQ, published April 20, 2026.
What changes when every company gets an equal weight?
Less influence from the largest companies
Equal weighting cuts the largest constituents’ relative influence after each rebalance, while the cap-weighted index reflects their share of the market’s float-adjusted value. Concentration is a moving target: S&P Dow Jones Indices reported that the top ten constituents made up 37.8% of the standard S&P 500’s weight on August 31, 2026. That is a dated snapshot, not a permanent allocation. The provider’s page reported 503 constituents on that date; the count can differ from 500 because some companies have more than one share class in the index. See the S&P 500 index page for provider details.
Different company-size, factor, and sector exposures
Equal weight is not simply the standard index with concentration removed. Because smaller constituents receive more weight than they would under market-cap weighting, equal weight tends to tilt toward smaller companies, value, and anti-momentum characteristics. Its sector weights also differ. These are tendencies created by the weighting method, not guaranteed or constant exposures; their size and effects can change over time. S&P Dow Jones Indices discusses these distinctions in its equal-weight FAQ.
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More rebalancing activity
Quarterly resets require the equal-weight index to trade as constituent prices move away from their target weights. In S&P Dow Jones Indices’ dashboard data through December 31, 2025, annualized turnover over the preceding 10-year measure was 0.22 for equal weight and 0.03 for the cap-weighted benchmark. These are index statistics for that stated period, not a direct estimate of any fund’s transaction costs. The equal-weight index page provides provider information.
How have their returns compared?
Performance depends on the period measured. S&P Dow Jones Indices’ December 2025 dashboard reports 10-year annualized total returns through December 31, 2025, of 11.7% for the S&P 500 Equal Weight Index and 14.8% for the S&P 500 benchmark. Equal weight’s reported 10-year relative return was -3.1%. These are USD index results for that historical window—not a forecast, and not the return an individual investor necessarily earned. See the provider’s equal-weight index materials.
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The figures illustrate why it is risky to choose a weighting method on the assumption it will outperform. A different start and end date can produce a different comparison. When reviewing performance, use the same dates, currency, and return type for both indexes, and distinguish total return—which includes reinvested dividends—from price return.
Which weighting method may fit your strategy?
The standard S&P 500 may fit if you want
- Conventional large-cap U.S. exposure in which company size determines index influence.
- To track the market’s changing distribution of large U.S. companies without deliberately reducing the biggest firms’ weights.
- A benchmark that is not designed to add equal-weight, smaller-company, value, or anti-momentum tilts.
Equal weight may fit if you want
- Less relative exposure to the biggest constituents than in the cap-weighted index.
- More influence from smaller S&P 500 constituents and are comfortable with the index’s associated factor and sector tilts.
- A strategy that resets constituent weights quarterly, accepting greater turnover and the possibility of wider performance differences from the standard index.
Neither choice is inherently better. They represent different allocations, and your preference should reflect the exposure you intend to hold rather than a prediction about which will lead next.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsWhat should you check before investing through a fund?
An index is not an investable account holding; a fund or other product attempts to track it. After deciding which index exposure you want, compare available products using current issuer information. This comparison does not establish terms for any specific fund.
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- Expense ratio: the fund’s stated ongoing fee.
- Tracking difference: how the fund’s returns have differed from its index over comparable periods.
- Liquidity: trading volume and bid-ask spread, which can affect the cost of buying or selling.
- Account availability: whether the product is available in your account and eligible for your intended use.
- Your own outcome: fund fees, tracking, taxes, and timing affect personal returns; index performance alone does not account for them.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
