VOO vs VTI: S&P 500 vs Total Market
VOO gives you the 500 largest U.S. companies; VTI adds the mid- and small-caps on top. They share the same 0.03% fee and roughly 85% of the same portfolio. Here's which to pick.
Don't have time? Here's what you need to know:
- 1VOO holds the S&P 500's ~500 large caps; VTI holds the whole U.S. market of ~3,600 stocks.
- 2Both charge 0.03% and overlap by roughly 85% because both are cap-weighted.
- 3Long-run returns are nearly identical; VTI leads when small caps run, VOO when mega-caps do.
- 4Own one, not both — pick VTI for total-market simplicity or VOO for pure S&P 500 exposure.
What Each Fund Actually Holds
VOO tracks the S&P 500 — roughly 500 of the largest U.S. companies, selected by a committee and weighted by market cap. VTI tracks the CRSP US Total Market Index, which holds essentially every investable U.S. stock: large, mid, small, and micro caps, totaling around 3,600 holdings. So the real question is not "which index is better" but "do you want only large caps, or the whole market?"
Here is the part that surprises people. Because both funds are capitalization-weighted, the giant companies dominate each one. The S&P 500 already makes up about 85% of total U.S. market value, so VTI is roughly 85% the same stocks as VOO. The extra ~15% in VTI is the long tail of mid- and small-cap names that VOO leaves out. That tail is what creates whatever difference exists between them.
Cost and Structure: A Genuine Tie
On fees, there is nothing to separate them. Both VOO and VTI carry a 0.03% expense ratio — $3 a year per $10,000 invested. Both are Vanguard open-end funds that reinvest dividends efficiently and are highly tax-efficient in taxable accounts thanks to the ETF in-kind redemption mechanism. Neither has a structural advantage over the other.
Both are also among the largest and most liquid ETFs in existence, with penny-wide bid-ask spreads. For a typical investor buying a few hundred or few thousand dollars at a time, trading costs are effectively zero for either fund.
| VOO | VTI | |
|---|---|---|
| Issuer | Vanguard | Vanguard |
| Index | S&P 500 | CRSP US Total Market |
| Holdings | ~500 | ~3,600 |
| Market-cap coverage | Large cap only | Large + mid + small + micro |
| Expense ratio | 0.03% | 0.03% |
| Structure | Open-end ETF | Open-end ETF |
Performance: Closer Than the Marketing Suggests
Over long stretches, VOO and VTI post nearly identical total returns — usually within a fraction of a percent annually. When small caps have a strong run, VTI edges ahead; when mega-cap tech leads (as it did through much of the 2010s and early 2020s), VOO's heavier large-cap tilt nudges it in front. Neither pattern is permanent, and over a full cycle they tend to converge.
On risk, VTI is very slightly more volatile because small caps swing harder than large caps, but the effect is muted — small caps are such a thin slice of VTI's cap-weighted portfolio that they barely move the needle. In practice, you should expect the two funds to feel almost the same day to day.
Tip: If you already own a separate small-cap or extended-market fund, VOO can be the cleaner large-cap building block. Pairing VTI with a small-cap fund double-counts the small caps VTI already holds.
Which One Is Right for You
Choose VTI if you want a true "own the whole U.S. market" holding in one ticker and prefer not to think about which slices you're missing. It is the natural core of a three-fund portfolio and the simplest single-fund U.S. equity position there is.
Choose VOO if you specifically want the S&P 500 — for example, to match a 401(k) benchmark, to pair cleanly with a dedicated small-cap sleeve, or simply because you prefer the index's quality screen (S&P requires positive earnings for inclusion, which VTI's total-market index does not). For most people, though, the honest answer is that either is an excellent choice and the difference will be small enough that you shouldn't agonize over it.
Important: Don't hold both VOO and VTI expecting diversification. They overlap ~85%; owning both just complicates your tax lots without meaningfully changing your exposure.
Frequently Asked Questions
Is VOO or VTI better for long-term investing?
Both are excellent and cost the same 0.03%. VTI owns the entire U.S. market (~3,600 stocks), so it's the more complete single-fund holding. VOO owns just the S&P 500's large caps. Because the S&P 500 is ~85% of U.S. market value, their long-run returns are very close. Pick VTI for total-market simplicity, VOO if you specifically want the S&P 500.
How much do VOO and VTI actually overlap?
By weight, roughly 85%. Both are cap-weighted, and the S&P 500 already represents about 85% of total U.S. stock-market value. VTI's distinct exposure is the remaining ~15% in mid-, small-, and micro-cap stocks that VOO doesn't hold.
Should I own both VOO and VTI?
Generally no. They duplicate each other by about 85%, so holding both adds complexity without real diversification. Pick one as your U.S. equity core. If you want more small-cap exposure than VTI provides, add a dedicated small-cap fund rather than stacking VOO on top of VTI.
Does VTI's small-cap exposure make a real difference?
Less than most people expect. Small and micro caps are a thin, cap-weighted slice of VTI, so they only modestly affect returns and volatility. VTI outperforms when small caps lead and lags slightly when mega-caps dominate, but over full market cycles the gap with VOO is usually a fraction of a percent.
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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.