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If you've searched "VOO vs SPY vs IVV," you're not alone. This is the most-searched ETF comparison on the internet — and for good reason. These three funds collectively hold nearly $2.7 trillion in assets and are the default answer to "how do I invest in the S&P 500?" But they're not the same product. The differences in cost, structure, and utility are real, and choosing the wrong one for your situation has a measurable cost over time.

Here's everything you need to know.

All three ETFs track the S&P 500 Index — 500 of the largest U.S. publicly traded companies, weighted by market cap. They hold the same underlying stocks, they rebalance together when the index changes, and they've all delivered essentially identical long-term returns. The differences come from everything else: structure, cost, liquidity, and tax treatment.

ETF
Issuer
Expense Ratio
AUM
Inception
Exchange
VOO
Vanguard
0.03%
$1,000B
Sep 2010
NYSE
IVV
iShares (BlackRock)
0.03%
$860B
May 2000
NYSE
SPY
SPDR (State Street)
0.0945%
$787B
Jan 1993
NYSE

This is the most commonly cited difference and the simplest. VOO and IVV both charge 0.03% annually — $3 per $10,000 invested. SPY charges 0.0945%, more than three times as much.

On a $10,000 investment compounding at 7% annually over 30 years, that cost difference adds up to approximately $1,400 in lost returns versus holding VOO or IVV. Over a career of investing, the gap is significant.

SPY's higher fee is a legacy of its 1993 structure as a Unit Investment Trust — a regulatory form that predates modern ETF architecture and carries constraints that made fee reduction difficult for many years. State Street has kept the fee intentionally high because SPY's massive liquidity and options ecosystem mean its primary users — institutional traders and hedge funds — don't care about 6 basis points. Long-term buy-and-hold investors should.

By every measure of trading liquidity, SPY is in a league of its own. It is the most actively traded ETF on earth:

SPY: average daily volume ~$40–50 billion
IVV: average daily volume ~$5–8 billion
VOO: average daily volume ~$3–5 billion

For buy-and-hold investors, this distinction is largely irrelevant. If you're placing a market order to buy $5,000 of an S&P 500 ETF once a month in your brokerage account, the bid-ask spread difference between SPY, VOO, and IVV is fractions of a cent — it won't affect your returns in any meaningful way.

For institutional traders, hedge funds, and anyone transacting in millions at a time, SPY's liquidity is decisive. Large blocks can be moved in SPY without meaningfully moving the market in a way that would be harder in VOO or IVV.

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