VTI or VOO? They’re 88% the same fund

People in the US and Canada search for “VTI vs VOO” about 30,000 times a month, more than any other fund comparison we measured. It’s a choice people take seriously, so here is the number behind it: the two funds overlap by 88%.

VOO holds the companies in the S&P 500. VTI holds almost all of those too, plus a long tail of smaller companies that are too small to move the total much. Nearly every company in VOO is also in VTI, and 88% of what’s in one fund is in the other, in the same amounts.

We have the full holdings of 61 US funds, taken from the reports each fund files with the SEC, so we worked out the same number for every pair of them: 1,411 in all. Most of it confirms what you’d guess. The dividend funds are the surprise.

88.1%VTI and VOO, the most searched pair

54.5%VOO and QQQ

0.14%VTI and VXUS

How the number works

Take each company that both funds own and note the smaller of its two weights. Add those up. If both funds put 6% into Apple, that’s 6 points. If one puts in 6% and the other 2%, it’s 2 points, because only 2% of the money is really doubled.

The total tells you how much of one fund you already own through the other. We count money on purpose, because two funds can own the same 500 companies in very different amounts. There’s an example of that further down.

VOO or SPY?

Another heavily searched pair, VOO against SPY at about 15,000 a month, is simpler still. They overlap by 99.7%. Both follow the S&P 500, so what separates them is mostly the fee. IVV and SPYM follow it too, and any two of the four overlap by 99.6% or more.

I have VOO. Does adding QQQ change much?

Less than two tickers suggest. VOO and QQQ overlap by 54.5%. Put $10,000 into each, and $5,450 of your QQQ money buys what your VOO already holds.

A third of that is three companies. Nvidia, Apple and Microsoft make up 18.4 of the 54.5 points.

Other growth funds tell the same story next to VOO:

VOO and VOOG: 65.8%, with 145 companies in both.
VOO and VUG: 57.5%, with 121 companies in both.
VOO and SCHG: 53.1%, with 121 companies in both.

And they repeat each other. VUG and SCHG overlap by 78.1%.

If you hold QQQ to lean further into tech, it does that. The lean is just smaller than owning two different funds makes it feel.

Why does it keep coming back to Nvidia?

Because the biggest companies sit near the top of almost every US fund. Of the 1,045 pairs that overlap at all, Nvidia is the largest shared holding in 337, about a third. Broadcom and Apple come next, in 55 and 53 pairs. When two of your funds overlap, the doubled part is usually a handful of very large companies you already know by name.

Are dividend funds all the same?

You’d expect two dividend funds to be close copies. Mostly they aren’t. SCHD against VYM, which people search about 4,800 times a month, overlaps by just 21.3%. SCHD in particular stands apart:

SCHD and VOO: 7.6%.
SCHD and VIG: 14.3%.
SCHD and DGRO: 20.1%.
SCHD and VYM: 21.3%.

Dividend growth funds are the exception. VIG and DGRO overlap by 70.4% across 249 companies, and VIG and VYM, another pair searched about 4,800 times a month, by 60.6%. The word “dividend” on a fund tells you less than its list of holdings does.

Is the two-fund portfolio really that clean?

Yes. VTI holds the US market, VXUS holds the rest of the world, and they overlap by 0.14%: four companies, all tiny. That’s about as separate as two funds get.

Swap VXUS for VT and it’s a different picture. VT is a world fund, so it already holds the US market, and VT and VTI overlap by 60.2%.

Same companies, different money

VOO and RSP both hold the S&P 500 and share 496 companies. They still overlap by only 44.4%, because RSP puts roughly the same amount into every company, so a small utility gets about as much as Apple does. Same names, very different portfolio.

What the numbers leave out

Overlap isn’t a mistake in itself. If you chose two funds knowing they overlap, the number just confirms it.
Holdings come from each fund’s latest SEC filing, which can be a few months old. Two funds whose filings are from different months can look less alike than they are.
Each fund page shows how much of the fund its filing covers, and we don’t publish a pair when that’s too incomplete to trust.
This is research, not investment advice. Nothing here is a recommendation to buy or sell anything.

Look up your own pair

Every pair has its own page, free and with no account.

Most people hold more than two funds, though. Vestiio opens the funds in your portfolio and shows what you own underneath all of them.

Overlap computed on 23 September 2026 from the holdings Vestiio stores from each fund’s own SEC Form N-PORT filing, read through the public endpoint /api/v1/public/etf-overlap/<ticker>.json: 61 funds, 1,411 pairs. For each company both funds hold, the figure takes the smaller of the two weights. Search volumes are Google Keyword Planner monthly averages for the United States and Canada, in English, over the twelve months to August 2026, with both word orders added together (“vti vs voo” and “voo vs vti”), measured on 20 September 2026 across every pairing of 16 popular funds. Every pair named above can be checked on its own page or in the overlap tool.