The Most Popular ETFs: What the Crowd Actually Owns

Popular by what measure?

Every ETF popularity ranking makes a choice before counting a single dollar. Sort by assets under management and the big index funds dominate. Sort by daily trading volume and the leaders tilt toward funds that traders use for fast, liquid exposure. The two lists overlap less than you might expect.

Assets measure what people hold. Volume measures what people trade. A retiree with a ten-year-old S&P 500 position shows up in the asset number and never in the volume number. A trader flipping shares four times before lunch is the reverse. So when a headline calls a fund the most popular, check the yardstick first.

For long-term investors, the asset measure is usually the more useful one. It shows where actual savings sit, and it comes from documents the fund companies publish themselves, which makes it checkable. The numbers below come straight from State Street and Vanguard, not from a third-party screener.

SPY and VOO: two crowds, one index

State Street's fund page listed SPY at $783,334 million in assets under management as of July 20, 2026. Call it $783 billion. Vanguard's fact sheet for VOO, dated June 30, 2026, put the ETF share class at $978,960 million, or about $979 billion. Count every share class of the underlying Vanguard fund, mutual fund shares included, and the same fact sheet reports about $1.68 trillion.

The two as-of dates differ by three weeks, so treat the comparison loosely. The shape of it is still clear: two funds tracking the identical index both sit near the top of the asset rankings, and together they hold well over a trillion and a half dollars.

Why do both exist at this size? SPY is the older fund and built its base back when index ETFs were a novelty, so it became the default vehicle for institutions and active traders. VOO's ETF share class launched on September 7, 2010 (Vanguard fact sheet) and grew up alongside the boom in automatic, low-cost indexing. VOO charges 0.03% a year, per the same fact sheet. As an illustrative example: a $10,000 position at a 0.03% expense ratio costs about $3 per year. At that price, fees stop being the deciding factor, and the choice between the giants often comes down to which brokerage an investor uses and which fund their retirement plan happened to offer.

What the crowd owns is top-heavy

Popularity has a second layer that leaderboards skip. The most widely held funds are index trackers, which means the crowd's money lands wherever the index is concentrated. Vanguard's June 30, 2026 fact sheet reports that VOO's ten largest holdings made up 37.9% of total net assets, led by NVIDIA at 7.5%.

That is not a flaw in the funds. Market-cap weighting does what it always does: it gives the biggest companies the biggest slice. But it changes what "buying the market" means in practice. An investor who owns VOO plus a technology fund plus a few individual mega-cap stocks may hold the same names three times over. Checking top-ten overlap across your funds is one of the more useful exercises a fund owner can do, and fact sheets publish the list for free.

Does popularity tell you anything useful?

A little, though probably not what most people hope.

A large asset base usually means tight trading spreads, low costs, and almost no risk of the fund closing and forcing an unwanted taxable sale. Those are real, practical advantages. What size does not tell you is anything about future returns. An asset ranking is a record of decisions already made: years of paychecks, retirement contributions, and rebalancing, much of it running on schedules set long ago. Historically, money has kept flowing into broad index funds through both rising and falling markets, which is what automatic contributions are built to do.

So read a popularity list as a map of where savings already sit. It says nothing reliable about which fund performs better from here, and the fund companies themselves make no such claim in the documents cited above.

If you want to see how individual investors are actually talking about a fund, rather than just how much money sits in it, ticker-level discussion beats a leaderboard. MarketPlays publishes news, sentiment, and community research on its symbol pages, for example the SPY symbol page, and the explore page tracks which tickers are drawing attention from investors right now.

Key takeaways

• ETF popularity rankings measure either assets held or shares traded, and the two methods produce different lists.
• By assets, the S&P 500 giants lead: VOO's ETF share class held about $979 billion as of June 30, 2026, and SPY about $783 billion as of July 20, 2026, per their own fund documents.
• Cheap access is the norm at the top. VOO charges 0.03%, which works out to about $3 a year on an illustrative $10,000 position.
• The most-owned index funds are concentrated: VOO's ten largest holdings were 37.9% of assets as of June 30, 2026, led by NVIDIA at 7.5%.
• Asset size signals liquidity and durability, not future performance.

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