VTI vs VOO 2026: Total Market or S&P 500 — Which Vanguard ETF Wins?

Short answer: VTI and VOO are both Vanguard index funds charging 0.03%, and they have delivered near-identical returns because the S&P 500 makes up roughly 85% of VTI by weight. VTI adds around 3,000 mid- and small-cap names on top; VOO holds the 500 largest US companies only. If you want one fund for the entire US market, buy VTI. If you want the benchmark everyone quotes and the cleanest pairing with other funds, buy VOO. Owning both is redundant.

VTI vs VOO at a glance

Metric	VTI (Vanguard Total Stock Market ETF)	VOO (Vanguard S&P 500 ETF)
Index tracked	CRSP US Total Market Index	S&P 500
Approx. holdings	~3,600 stocks	~500 stocks
Coverage	Large, mid, small and micro cap	US large cap only
Expense ratio	0.03%	0.03%
Launched	2001	2010
Structure	Open-end fund (1940 Act)	Open-end fund (1940 Act)
Dividends	Quarterly	Quarterly
Overlap with the other	~85% of VTI's weight is the S&P 500	~100% of VOO sits inside VTI
Best suited for	One-fund total US equity exposure	Benchmark large-cap core, easy pairing

The only real difference: what sits outside the S&P 500

VOO buys the S&P 500 — the 500 largest, profitable, US-listed companies chosen by a committee at S&P Dow Jones Indices. VTI buys effectively the entire investable US stock market via the CRSP US Total Market Index, which currently runs to somewhere around 3,600 constituents.

That sounds like a huge difference in diversification. In practice it is not, because both are market-capitalisation weighted. The extra ~3,100 companies in VTI are, by definition, the smallest ones — collectively they account for roughly 12–15% of the fund. The top 10 holdings in both funds are the same handful of megacap technology names, in almost the same weights.

So the honest framing is this: VTI is VOO plus a 12–15% sleeve of US mid-, small- and micro-cap stocks. Everything else about the two funds is functionally the same.

Performance: why the returns look almost identical

Because of that overlap, VTI and VOO have a correlation of roughly 0.99 and their annual returns typically land within a fraction of a percentage point of each other. Neither has a structural cost advantage — both charge 0.03%, both use the same open-end structure, both engage in securities lending, and both benefit from the in-kind creation/redemption mechanism that keeps ETF capital gains distributions near zero.

Which one leads in a given year comes down entirely to whether small caps beat large caps:

• Large-cap leadership (the dominant pattern of the last decade, driven by the AI capex cycle) — VOO edges ahead, because VTI's small-cap sleeve drags on returns.
• Small-cap rotation (typically early-cycle, after rate cuts, when credit conditions loosen) — VTI edges ahead.

Over very long periods the gap has been small in either direction. Anyone claiming one of these funds decisively beats the other is usually cherry-picking a start date.

The concentration problem both funds share

Adding 3,000 small caps does not solve VTI's biggest risk, because those small caps carry almost no weight. Both funds are heavily exposed to a small group of megacap technology and AI-linked companies. If that group derates, both funds fall together.

This is the single most important thing to understand before buying either one. Our NVIDIA stock forecast for 2026 covers how much of the index's direction now hinges on one AI capex cycle, and if you are also weighing the trading-vehicle question, our VOO vs SPY comparison explains why the same index can come in two very different wrappers.

When VTI is the better choice

• You want one fund and nothing else. VTI is the cleanest single-ticker US equity allocation available. No decisions about whether to bolt on a small-cap fund later.
• You believe small caps are due a cycle. Historically, small caps have outperformed after rate-cutting cycles begin and credit spreads narrow. VTI gives you that exposure automatically.
• You dislike index-committee risk. S&P 500 membership is decided by a committee with discretionary criteria including profitability. CRSP's rules-based total-market approach removes that judgement layer — and means VTI owns companies before they are promoted into the S&P 500.

When VOO is the better choice

• You want the benchmark. The S&P 500 is the number quoted on every news broadcast and the reference for nearly every performance comparison. Owning it removes tracking-error anxiety.
• You are building a multi-fund portfolio. VOO pairs cleanly with a deliberate small-cap allocation (for example VXF, the extended-market fund that holds everything in VTI that is not in the S&P 500) so you control the weighting rather than accepting the market's.
• You want a quality tilt. The S&P 500's profitability requirement filters out unprofitable micro caps that VTI holds by default.
• Tax-loss harvesting. VTI and VOO are close enough that some advisors treat swapping between them as a wash-sale risk, but pairing VOO with a differently-indexed large-cap fund gives cleaner harvesting partners.

Should you own both?

No. Holding VTI and VOO together is one of the most common portfolio redundancies in retail investing. Because ~85% of VTI's weight already is VOO, a 50/50 split leaves you with roughly 93% large-cap exposure — essentially VOO with a rounding error, plus two positions to rebalance instead of one.

If your goal is more small-cap exposure than VTI provides by default, the right structure is VOO (or VTI) as the core plus an explicit extended-market or small-cap value sleeve sized to a weight you actually chose.

The alternatives worth knowing

• ITOT (iShares Core S&P Total US Stock Market) — 0.03%, total-market equivalent to VTI tracking an S&P index instead of CRSP. A common tax-loss-harvesting partner for VTI.
• SPTM (SPDR Portfolio S&P 1500) — 0.03%, broad US coverage from State Street.
• VXF (Vanguard Extended Market) — holds everything in VTI that is not in the S&P 500. Pair with VOO to replicate VTI at a weighting you control.
• IVV / SPLG — S&P 500 alternatives to VOO at 0.03% and 0.02% respectively.

Check the level before you buy

Neither fund protects you from buying at a stretched valuation. Before committing capital, look at where the index sits against its moving averages and momentum readings — our free technical analysis tool gives a live read on the S&P 500 and its major components, and the wider markets toolkit covers the economic calendar and earnings dates that move US equities most.

If you would rather trade the index actively than hold a fund, our indices signals hub tracks how the major index levels are being traded, and you can open a broker account for access to index CFDs, cash equities and ETFs from one platform.

Bottom line

VTI and VOO cost the same, are run by the same manager, and share roughly 85% of their weight. VTI is the simpler one-fund answer and captures the whole US market. VOO is the benchmark and the cleaner building block for a portfolio you intend to fine-tune. Pick one, hold it, and put your energy into contribution rate rather than ticker selection — the difference between these two funds will be a rounding error next to how much you invest and for how long.

For the wider picture across every fund category, see our guide to the best ETFs of 2026.