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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchVOO is still a compelling S&P 500 ETF, but it is not the automatic best choice for every investor. Vanguard reports a 0.03% expense ratio for VOO; IVV reports the same fee, while SPYM reports a lower 0.02% gross expense ratio. SPY also tracks the S&P 500, but has a different fund structure. The practical choice depends on more than a small fee difference: consider each fund’s stated objective, structure, trading needs and the features available in your brokerage account.
What does VOO own, and what is it designed to do?
VOO is Vanguard’s exchange-traded fund designed to track the S&P 500 Index, a benchmark dominated by large U.S. companies. Vanguard’s official product page describes the fund as seeking to track the investment performance of that index: Vanguard VOO product page. Its fact sheet listed 504 stocks as of March 31, 2026. The stock count is a snapshot, not a promise that the fund will always hold exactly that many securities.
Because VOO follows a broad large-cap index rather than selecting stocks through an active manager, it gives investors exposure to many of the largest publicly traded U.S. companies in a single fund. It is still an equity investment: its value can fall when the underlying market falls, and an S&P 500 fund is not a complete portfolio by itself for every investor.
How do VOO, IVV, SPYM and SPY compare?
| ETF | Benchmark or objective | Reported expense ratio | Structure detail established by cited source |
|---|---|---|---|
| VOO | Seeks to track the S&P 500 Index. | 0.03%, as of April 28, 2026 (Vanguard). | Not stated in the cited product fact sheet. |
| IVV | Seeks to track the S&P 500 Index. | 0.03%, in BlackRock/iShares’ current prospectus as shown on its product page when captured in 2026. | Not stated in the cited product page. |
| SPYM | Seeks, before fees and expenses, to generally correspond to the total returns of the S&P 500 Index. | 0.02% gross, in State Street Investment Management’s March 2026 fact sheet. | Not stated in the cited fact sheet. |
| SPY | Tracks the S&P 500. | Not stated in the cited source. | Its SEC filing describes SPY as a unit investment trust that holds substantially all index component stocks in substantially the same weights. |
Sources: Vanguard VOO product page and fact sheet; iShares IVV product page; State Street SPYM product page and March 2026 fact sheet; SPY SEC filing.
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#1 Best Overall
VOO and IVV: a close fee-and-benchmark match
VOO and IVV both seek to track the S&P 500 and both report a 0.03% expense ratio in the cited 2026 materials. That makes them close direct substitutes on the basic measures shown here. The published figures do not establish that one will outperform the other, and they do not resolve which is a better fit for a particular brokerage account.
SPYM: the lowest reported fee in this comparison
State Street’s March 2026 fact sheet reports a 0.02% gross expense ratio for SPYM, one basis point below the reported 0.03% ratios for VOO and IVV. The fact sheet states an objective of generally corresponding to the S&P 500’s total returns before fees and expenses. Fee schedules and product details can change, so check the current fund materials when making a decision.
Rank #2
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SPY: same broad index, distinct trust structure
SPY is another direct S&P 500 alternative. Its SEC filing describes it as a unit investment trust holding substantially all component stocks of the index in substantially the same weights. That is a meaningful structural distinction from the other alternatives considered here; the cited sources do not provide enough consistent detail to compare all four structures point by point.
How much should the expense ratio matter?
An expense ratio is an ongoing fund expense expressed as a percentage of assets. On a hypothetical $10,000 investment, a 0.03% annual expense ratio corresponds to about $3 for a year, while 0.02% corresponds to about $2, before considering changes in investment value or other costs. These are simple illustrations of the stated rates, not estimates of total investor cost or a forecast of returns.
Vanguard’s March 31, 2026 fact sheet lists VOO’s 0.03% expense ratio alongside a 0.41% average for S&P 500 index funds. The latter is Vanguard’s stated S&P 500 index-fund average; it should not be read as an ETF-only average. The comparison can give context for VOO’s fee, but it does not show that VOO is cheaper than every ETF alternative listed above.
A one-basis-point difference, such as 0.03% versus 0.02%, is a small annual difference in percentage terms. It does not guarantee a meaningfully different result for an individual investor, and fees alone do not determine returns. For exact current terms, consult the fund’s own prospectus or fee information: Vanguard, iShares and State Street.
Rank #4
Trading costs and account features can change the practical choice
The expense ratio is not the only cost of owning an ETF. Investors may also encounter trading costs, including the bid-ask spread: the difference between the price buyers are offering and the price sellers are asking. It varies with trading conditions and can affect the price at which an investor buys or sells.
Vanguard’s ownership-cost example estimated one-year costs of $35.15 for VOO and $96.86 for SPY per $100,000 invested, using average bid-ask spreads from 2022 and the assumptions stated in its paper. These are historical estimates, not current cost forecasts, and they should not be used as a present-day ranking of the funds’ trading costs. See Vanguard’s ETF ownership-cost paper.
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Current, comparable evidence here does not establish a reliable liquidity ranking across all four funds. If you trade often or place a large order, check live bid-ask quotes and consider using a limit order rather than assuming that a fund’s expense ratio tells the whole cost story. Also check whether your brokerage offers features you value, such as fractional ETF investing or commission-free ETF trades; availability and terms depend on the brokerage and account.
How to choose among the four
- Choose by benchmark first. If your goal is S&P 500 exposure, each fund is presented as a direct alternative, though SPYM’s stated objective is phrased as generally corresponding to the index’s total returns before expenses.
- Compare current fees on the same basis. Confirm each fund’s current expense ratio and whether a quoted rate is gross or otherwise qualified. The figures above come from materials with different dates.
- Consider structure and trading needs. SPY’s unit investment trust structure is documented in its SEC filing. For any fund, assess current trading conditions if your expected trade size or frequency makes spreads important.
- Check your account mechanics. Availability, fractional-share support and brokerage terms may matter more to your experience than a one-basis-point annual fee difference.
- Do not choose based on a promised winner. The cited facts do not establish that any one fund will outperform the others or deliver a personalized tax advantage.
This is general fund-comparison information, not individualized investment advice. Fund fees and details can change; review current official materials before investing.
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