Last updated: July 2026

This article is for informational purposes only and is not investment advice. See our full Disclaimer for details.

If you’ve spent any time researching index investing, you’ve run into this exact question: VOO or VTI? They’re both run by Vanguard, both charge the same rock-bottom fee, and both are often described as “basically the same fund.” That last part is mostly true — but not entirely, and the difference matters more in some market conditions than others.

This article breaks down exactly what separates these two funds, where they overlap almost completely, and which one tends to fit which kind of investor.

The Quick Answer

VOO tracks the S&P 500 — roughly the 500 largest U.S. companies. VTI tracks nearly the entire U.S. stock market — thousands of companies, including the same large caps in VOO plus mid-cap, small-cap, and micro-cap stocks on top.

Because large-cap companies make up the vast majority of the U.S. stock market’s total value, the two funds move almost in lockstep. Historically, their returns have been correlated at around 0.99 — about as close to identical as two different funds can get. The practical difference comes down to how much exposure you want to smaller companies, and that’s a smaller decision than the “VOO vs. VTI” debate sometimes makes it sound.

VOO and VTI Side by Side

Metric	VOO	VTI
Full name	Vanguard S&P 500 ETF	Vanguard Total Stock Market ETF
Index tracked	S&P 500	CRSP US Total Market Index
Number of holdings	~500	~3,500–4,000
Expense ratio	0.03%	0.03%
Approx. AUM	~$900B+	~$600B+
Top 10 holdings concentration	~37–41% of assets	~32–36% of assets
Dividend yield	~1.2%	~1.2%
Beta (vs. total market)	~0.99	~1.01
Issuer	Vanguard	Vanguard

Figures are approximate and sourced from public ETF data providers as of mid-2026. Holdings counts, AUM, and concentration percentages shift regularly — always confirm current numbers on Vanguard’s official fund pages before making a decision.

Notice that the expense ratio, issuer, and dividend yield are essentially identical. The real differences are in what’s inside each fund and how concentrated that exposure is.

What Each Fund Actually Holds

VOO is built entirely from the S&P 500 Index — a committee-selected list of roughly 500 large, established U.S. companies that meet specific profitability and liquidity criteria. It’s not simply “the 500 biggest companies”; it’s the 500 companies that an S&P index committee has determined represent the large-cap U.S. market.

VTI, on the other hand, doesn’t apply that kind of selection. It aims to hold essentially the entire investable U.S. stock market — every publicly traded U.S. company above a minimal liquidity threshold, weighted by market capitalization. That includes all the same mega-cap names in VOO, plus thousands of mid-cap, small-cap, and micro-cap companies that the S&P 500 leaves out entirely.

Here’s the part that surprises a lot of new investors: because both funds are market-cap-weighted, and because large-cap companies dominate the total value of the U.S. stock market, roughly 80-85% of VTI’s total weight is made up of the same companies that are in VOO. The additional thousands of small and mid-cap stocks in VTI only account for the remaining 15-20% of the fund.

In other words, you’re not choosing between “large companies” and “the whole market” as much as you’re choosing how much of a mid/small-cap sleeve you want layered on top of a portfolio that’s already large-cap-dominated either way.

Concentration: The Real Difference

The most meaningful structural difference between these two funds is concentration at the top.

Because VOO only holds ~500 stocks, its largest positions make up a bigger share of the total fund — recent data puts VOO’s top 10 holdings at roughly 37-41% of total assets. VTI spreads that same mega-cap exposure across a much larger base of holdings, bringing its top 10 concentration down to roughly 32-36%.

In practice, this means:

• When a handful of mega-cap companies (think the largest technology names) are driving the market higher, VOO tends to capture slightly more of that upside, since those companies make up a larger share of the fund.
• When market leadership broadens out and smaller companies start outperforming, VTI has more built-in exposure to capture that shift, since it holds those companies at meaningfully higher weights than VOO does.

Neither pattern holds in every market environment, and past patterns are not a guarantee of what happens next — but this concentration difference is the actual mechanical reason the two funds occasionally diverge in performance, even though they track almost the same underlying companies.

Performance History: How Close Are They Really?

Over the past decade, VOO has posted a slightly higher average annual return than VTI — figures from ETF data providers put VOO’s 10-year average annual return in the neighborhood of 15%, compared to roughly 14.5-14.75% for VTI. That gap is almost entirely explained by the concentration difference above: large-cap, and especially large-cap technology stocks, have been the strongest-performing segment of the U.S. market for most of the past ten years, and VOO simply has more exposure to that segment per dollar invested.

That’s a look backward, not a forecast. Small and mid-cap stocks have led the market during other multi-year stretches in market history, and there is no reliable way to predict which fund will “win” over your own specific investment horizon. A one-percentage-point historical gap over a decade is also small enough that it can flip depending on the exact time period measured.

Volatility and Risk

VOO and VTI are both diversified, low-cost, broad-market funds — neither is a “risky” fund in the way a single stock or a thematic ETF would be. That said, there are small differences worth knowing:

• Beta: VTI’s beta (~1.01) is marginally higher than VOO’s (~0.99), meaning VTI tends to be slightly more sensitive to overall market moves. This mostly reflects the added volatility that smaller companies typically carry relative to large caps.
• Drawdowns: Depending on the measurement period, small and mid-cap-heavy funds like VTI can see somewhat sharper drawdowns during broad market downturns, since smaller companies are often hit harder in a sell-off than mega-cap, balance-sheet-heavy companies.
• Recovery behavior: The flip side is that when the market recovers, the additional small/mid-cap exposure in VTI has, at times, also participated more strongly in the rebound.

None of this makes one fund meaningfully “safer” than the other in a day-to-day sense — both will fall and rise with the broader U.S. market. The differences show up at the margins, not at the core.

Dividends and Tax Considerations

Both funds pay dividends quarterly, and their yields track very closely — typically within a tenth of a percentage point of each other, since the same large dividend-paying companies dominate both funds’ income.

Neither fund is designed with tax efficiency as a differentiator versus the other; both are run using Vanguard’s standard ETF share-class structure, which is generally considered tax-efficient compared to traditional mutual funds. If you’re investing through a Roth IRA, traditional IRA, or 401(k), this distinction matters less, since those accounts shelter you from annual dividend taxation either way.

Liquidity and Trading

Both VOO and VTI are among the most heavily traded ETFs in the world, with tight bid-ask spreads and deep daily volume. For the vast majority of individual investors — including anyone making regular, long-term contributions rather than actively trading in and out — this difference is not something you’re likely to notice in practice. Both are liquid enough that trading costs are a minor consideration relative to the expense ratio and your own contribution schedule.

Should You Hold Both?

Because VOO and VTI are correlated at roughly 0.99, holding both in the same portfolio provides very little additional diversification. You’d effectively be doubling up on the same large-cap core while adding unnecessary complexity — more tickers to track, more rebalancing decisions, without materially changing your risk exposure.

If your goal is broader diversification, a more meaningful complement to either fund is something outside U.S. large/total-market equities entirely — for example, an international fund or a bond fund — rather than owning both VOO and VTI at once.

Which One Fits Your Situation?

VOO may be a more natural fit if:

• You want direct, simple exposure to the large, established companies most people mean when they talk about “the stock market”
• You’re comfortable with a fund that’s somewhat more concentrated in its largest holdings
• You want the S&P 500 specifically, as a widely quoted, familiar benchmark

VTI may be a more natural fit if:

• You want the broadest possible slice of the U.S. stock market in a single fund, including small and mid-cap companies
• You’d rather not make an active bet on large-caps continuing to lead the market
• You like the idea of a true “own the entire market” one-fund approach

For many long-term, buy-and-hold investors, the honest answer is that either choice is reasonable, and the decision matters far less than simply investing consistently and keeping costs low — which both funds do equally well.

Frequently Asked Questions

Is VOO or VTI better for beginners? Both are widely considered strong “starter” core holdings because of their low costs, broad diversification, and simplicity. Neither requires ongoing stock-picking decisions. The choice between them is a secondary detail compared to the decision to start investing consistently in a low-cost index fund at all.

Can I switch from one to the other later? Yes, though doing so in a taxable brokerage account could trigger a capital gains tax event if the position has grown in value. Selling to switch between two funds that are 99% correlated is rarely worth the tax cost for most investors — inside a tax-advantaged account like an IRA or 401(k), switching has no tax consequence.

Does VTI include international stocks? No. Despite the name “Total Stock Market,” VTI is U.S.-only. For international exposure, investors typically pair a U.S. fund like VOO or VTI with a separate international fund such as VXUS.

Which fund has performed better recently? Recent performance shifts depend on whether large-cap or small/mid-cap stocks have been leading the market in that specific stretch of time. Because this leadership rotates, “which fund performed better” can look different depending on the exact window you measure — check current data before drawing conclusions from any single time period.

Is there a meaningful cost difference between VOO and VTI? No. Both currently charge a 0.03% expense ratio, among the lowest of any ETF on the market. Cost is not a differentiating factor between these two funds.

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This article reflects publicly available fund data as of the “last updated” date above and is provided for informational purposes only — it is not a recommendation to buy or sell any security. Expense ratios, holdings, AUM, and performance figures change over time; always verify current data directly on Vanguard’s official fund pages before making an investment decision. Read our full Disclaimer and Privacy Policy for more information.