VOO vs VTI vs SPY: Which S&P 500 ETF Should You Buy?

If you've spent five minutes in any investing forum, you've seen this debate. VOO or VTI? What about SPY? Which one is the "best"? The argument goes in circles, and for good reason — the honest answer is that it barely matters. But the why behind that answer is worth understanding, because it'll help you stop second-guessing your choice and start actually investing.

Let's dig into each fund, what makes them different, and how to make a decision you won't spend years second-guessing.

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The Quick Summary

| | VOO | VTI | SPY | |---|---|---|---| | Issuer | Vanguard | Vanguard | State Street (SPDR) | | Index tracked | S&P 500 | CRSP US Total Market | S&P 500 | | Expense ratio | 0.03% | 0.03% | 0.0945% | | # of holdings | ~503 | ~3,600+ | ~503 | | AUM | ~$500B+ | ~$400B+ | ~$580B+ | | Dividend yield | ~1.3% | ~1.3% | ~1.3% | | Best for | Long-term investors | Long-term investors | Active traders |

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VOO: Vanguard S&P 500 ETF

VOO tracks the S&P 500 — 500 of the largest publicly traded companies in the United States. It's managed by Vanguard, the firm practically built on the philosophy that low costs beat active management over the long run.

Expense ratio: 0.03%

That means on a $10,000 investment, you pay $3 per year in fees. That's not a typo. It's effectively free.

VOO is the fund most long-term investors reach for when they want simple, cheap, broad U.S. equity exposure. It follows the same index as SPY but costs roughly three times less annually.

The fund's top holdings are what you'd expect — Apple, Microsoft, Nvidia, Amazon, Alphabet, Meta. Mega-cap tech dominates, making up roughly 30% of the fund by weight. That's the S&P 500 for you in 2026: it's not 500 equally weighted companies, it's market-cap weighted, meaning the biggest companies have the most pull.

Who it's for: Buy-and-hold investors who want ultra-low cost S&P 500 exposure and don't need to trade in and out frequently.

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VTI: Vanguard Total Stock Market ETF

VTI tracks the CRSP US Total Market Index, which includes essentially every publicly traded U.S. company — large-cap, mid-cap, small-cap, and micro-cap. We're talking over 3,600 holdings compared to VOO's 503.

Expense ratio: 0.03%

Same cost as VOO. The extra diversification is essentially free.

So what do you actually get with VTI that you don't get with VOO? Exposure to smaller companies. Mid-cap and small-cap stocks make up roughly 20–25% of VTI by weight. Historically, smaller companies have had higher long-run returns (the "size premium"), though they also carry more volatility.

That said, the top holdings in VTI are identical to VOO. The same Apple, Microsoft, Nvidia triumvirate sits at the top, and the massive weight of large-caps means VTI and VOO are highly correlated — often moving together with a correlation above 0.99.

The practical difference over any single year is small. Over 30 years, the added small-cap exposure in VTI might compound to something meaningful. Or it might not. Academic evidence on the persistence of the size premium is debated.

Who it's for: Investors who want true total market exposure and like the idea of holding the entire U.S. equity market in one fund.

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SPY: SPDR S&P 500 ETF Trust

SPY was the first U.S.-listed ETF, launched in 1993. It tracks the same S&P 500 index as VOO and holds virtually identical companies in virtually identical weights.

Expense ratio: 0.0945%

Here's the catch: SPY is roughly three times more expensive than VOO on an ongoing basis. That's not dramatic in absolute terms — we're talking maybe $6–7 per year per $10,000 invested — but over 30 years, it compounds into a real gap.

So why does SPY still have the most assets under management of any ETF in the world? Liquidity. SPY trades over $20–30 billion in volume on a typical day. That kind of liquidity means institutional traders, hedge funds, and options market participants can move massive size without moving the price. The bid-ask spread on SPY is nearly zero.

For a retail investor putting $500 a month into an index fund, that liquidity advantage is irrelevant. You're not trading $500 million at a time.

Who it's for: Active traders, institutions, and options traders who need the best liquidity available. Long-term buy-and-hold investors are almost always better off with VOO.

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Why the Difference Barely Matters

Let's say you invest $500 per month for 30 years and the market returns 8% annually.

• With VOO (0.03% ER): ending balance ~$735,000
• With SPY (0.0945% ER): ending balance ~$718,000

The gap is about $17,000 — real money, but not life-changing. The thing that matters overwhelmingly more is whether you actually invest consistently and stay invested through downturns.

VOO vs VTI is an even more academic debate. The performance difference over most trailing periods is less than 1% annualized. Pick one, automate contributions, and don't look back.

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The VOO vs VTI Decision

If you truly cannot decide, ask yourself one question: Do you want to own only the largest U.S. companies, or the entire U.S. market?

If you have no strong preference, go with VTI. You get slightly more diversification at the same cost. If you're already comfortable with the S&P 500 as a benchmark and want a fund with a longer performance history relative to the index, VOO works just as well.

Either way, you're making a sound, evidence-based decision. The people losing the most in the market aren't choosing between VOO and VTI — they're timing the market, chasing meme stocks, and switching funds every six months.

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Common Questions

Can I hold both VOO and VTI? You can, but it's redundant. VTI already contains everything in VOO, plus more. If you hold 50% of each, you're still overweight large-cap relative to a pure total market fund.

Does it matter which brokerage I use? If you're investing at Fidelity, you might look at FXAIX (Fidelity's S&P 500 index fund) or FSKAX (total market) — both also have 0.015% expense ratios. The logic is the same.

What about IVV? iShares' S&P 500 ETF charges 0.03%, same as VOO, and is a perfectly valid alternative. VOO and IVV are functionally identical for long-term investors.

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Screen for More Opportunities

If you want to go beyond index funds and analyze individual stocks or ETF sectors more deeply, the Value of Stock Screener gives you tools to filter by valuation, yield, and fundamentals — without the noise.

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Further Reading

For a deeper dive into low-cost index investing, John Bogle's The Little Book of Common Sense Investing is the original source — written by the founder of Vanguard himself. It's the clearest argument ever made for why simple beats complex.

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This article is for informational and educational purposes only. Nothing here is financial advice. Always do your own research before making investment decisions.