VOO vs. VTI: Is the Total Market ETF Riskier Than the S&P 500?

When investors want simple, low-cost exposure to the U.S. stock market, two Vanguard ETFs usually dominate the conversation: the Vanguard S&P 500 ETF VOO -0.86% ▼ and the Vanguard Total Stock Market ETF VTI -0.92% ▼ . At first glance, the two funds look almost identical. Both charge the same ultra-low 0.03% expense ratio, have similar top holdings, and offer a dividend yield of around 1.13%. However, the real difference comes down to diversification and market exposure. VOO may offer a slightly smoother ride because of its focus on established large-cap leaders. VTI, on the other hand, provides broader diversification and the potential for stronger long-term risk-reward by capturing the full U.S. equity market.

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Using the TipRanks’ ETF Comparison Tool, we compared VOO and VTI on multiple parameters. Below is a screenshot.

Let’s look at more details.

VOO or VTI: The Key Difference

VOO tracks the S&P 500 Index (SPX), which includes roughly 500 of the largest U.S. companies by market capitalization. VOO currently holds about 507 stocks, heavily weighted toward the technology sector and manages roughly $872.4 billion in assets. The fund is also more concentrated at the top compared with broader market ETFs. In fact, its top 10 holdings account for about 38.35% of the portfolio, meaning a handful of mega-cap stocks have a major influence on its performance.

VTI, by contrast, casts a much wider net. It tracks the CRSP US Total Market Index and owns thousands of companies across the entire U.S. market — from the same mega-cap leaders down to mid- and small-cap stocks. Currently, VTI holds roughly 3,468 stocks and manages about $580.65 billion in assets.

VOO’s top 5 positions are Nvidia NVDA -1.04% ▼ , Apple AAPL -1.02% ▼ , Microsoft MSFT -0.02% ▼ , Amazon AMZN -1.19% ▼ , and Alphabet GOOGL -0.44% ▼ . These same companies also rank among the largest holdings in VTI. Around 82% of its holdings overlap with VOO, which is why the two ETFs tend to move very similarly over time.

However, the remaining exposure to other companies is where the key difference lies. By owning far more stocks overall, VTI provides broader diversification and exposure to parts of the market that VOO does not. VTI also benefits from a built-in rebalancing effect, allowing investors to gain exposure to rising companies before they eventually become large enough to enter the S&P 500—something VOO does not capture.

Risk Profile: VOO vs. VTI

When it comes to pure risk metrics, VOO holds a slight advantage over VTI. VOO’s beta of 0.99 is also slightly lower than VTI’s 1.01, meaning it is marginally less sensitive to broader market swings.

The reason is fairly simple. VOO focuses on large-cap companies — the type of businesses that typically hold up better during market downturns. These firms tend to have stronger balance sheets, more stable cash flows, and greater institutional support. As a result, when markets decline sharply, mega-cap stocks often fall less than smaller companies.

On the other hand, VTI includes stocks across the broader U.S. market. That extra exposure adds diversification, but it can also introduce slightly higher volatility, especially during market sell-offs. In strong bull markets, the difference is often minor, but during sharp downturns, it can lead to steeper falls.

Conclusion

The difference between VOO and VTI may seem subtle, but it can meaningfully shift the balance between risk and potential return.

VOO may be the better choice for investors seeking slightly lower volatility and pure exposure to large U.S. companies. Over the past decade, it has delivered strong risk-adjusted returns and may appeal more to conservative investors or those approaching retirement. VTI, on the other hand, may suit investors who want exposure to the entire U.S. stock market in a single fund.

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