VTI vs VOO Overlap: How Much Do They Share?
VTI holds 3,700 stocks. VOO holds 505. Every VOO stock is inside VTI. See the live top-10 comparison and what the overlap means for your portfolio.
What the VTI and VOO Overlap Means
VOO is not a complement to VTI. Every company in VOO is also in VTI. The S&P 500 — which VOO tracks — represents approximately 83% of total US stock market cap, which means VOO's 505 stocks account for roughly 83% of VTI's total portfolio weight. Their top-10 holdings are the same companies in nearly identical order.
Owning both does not diversify your portfolio. It tilts you toward large-cap stocks. If you put $7,000 in VTI and $3,000 in VOO, your effective exposure becomes roughly 94% large-cap — not a diversified market portfolio plus a complement. You are concentrating your bet on the same companies, not spreading it.
The practical choice: pick one. VTI if you want the complete US market at every size tier. VOO if you specifically want the S&P 500's 505 largest companies. Most investors building a 3-fund portfolio default to VTI for broader coverage. The expense ratio and brokerage are identical — the decision comes down to whether you want mid- and small-cap exposure in your core fund.
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Top-10 holdings data, updated regularly from public sources. Shared position counts reflect top-10 positions only — not full portfolio overlap. For broad market funds like VTI and VOO, true full-portfolio overlap is significantly higher than the top-10 figure. Nothing here is personalized financial advice. Full disclosures.
Frequently Asked Questions
Yes, almost entirely. Every company in VOO is also in VTI. The S&P 500 (which VOO tracks) represents approximately 83% of total US stock market cap, so VOO's 505 stocks make up about 83% of VTI's portfolio weight. Their top-10 holdings are effectively the same list.
No — there is no meaningful reason to own both. Owning both tilts you heavier toward large-cap stocks without adding diversification. Pick VTI for the full US market (including mid- and small-cap) or VOO for the S&P 500 specifically. Both charge 0.03% and are issued by Vanguard.
Over the past 20 years, the annualized total return difference is under 0.2%. VTI edges out VOO when small- and mid-cap stocks outperform (as they did in some periods). VOO pulled slightly ahead during 2010 to 2020 when mega-cap tech dominated. Neither is consistently better — the difference comes down to whether you want mid- and small-cap exposure in your core fund.
Approximately 83% of VTI's total portfolio weight. The S&P 500 covers the 505 largest US companies by market cap, which together represent about 83% of the total US equity market. VTI's remaining 17% is spread across roughly 3,200 additional mid- and small-cap companies.
Yes — for most investors, either fund serves the same core purpose. You lose mid- and small-cap exposure (about 17% of VTI's weight) by switching to VOO, but those companies have a smaller long-run impact than the identical large-cap core. If you are in a tax-advantaged account and want to make the switch, verify there are no taxable event implications.