Here's a number that'll make you look at your portfolio differently: 94.8% of QQQ's holdings — by weight — are stocks that already live inside VOO. Not a small overlap. Almost complete overlap.
If you own both, you're not doubling your diversification. You're mostly just doubling your exposure to the same names — and paying two sets of fund fees to do it.
Toss VGT into the mix and it gets stranger. Your top three positions — NVIDIA, Microsoft, and Apple — are now each appearing in three separate funds simultaneously. Three ETFs. Three expense ratios. One concentrated bet on the same handful of companies.
This is the ETF overlap problem. It's quiet, it looks like diversification on paper, and it catches a lot of careful people off guard.
Look at what's actually inside
The simplest way to see what's happening is to pull the top holdings of the three most popular growth and broad-market ETFs side by side. Here's what's sitting inside them as of mid-2026:
| Stock |
QQQ (weight) |
VOO (weight) |
VGT (weight) |
| NVIDIA |
~8.7% |
~7.9% |
~17.2% |
| Apple |
~7.1% |
~7.1% |
~13.1% |
| Microsoft |
~5.3% |
~5.1% |
~13.7% |
| Amazon |
~4.9% |
~3.5% |
— |
| Alphabet |
~4.5% |
~5.5% |
— |
| Broadcom |
~3.5% |
~2.6% |
~4.3% |
Approximate weights as of mid-2026. Sources: Invesco and Vanguard fund pages. Holdings shift daily with price.
The first three rows are the story. NVIDIA, Apple, and Microsoft dominate all three funds. If you own QQQ, VOO, and VGT together, those three stocks alone might represent 15–20% of your entire portfolio — or more, depending on how much you have in each fund.
That's not bad by accident. It's baked into how these funds work.
Why every "diversified" ETF keeps buying the same things
These funds don't pick stocks based on what you already own. They rank companies by size — the bigger the company, the bigger its slice of the fund.
NVIDIA, Apple, and Microsoft are the three largest US companies by market value. So they float to the top of every US stock index, every time. It doesn't matter whether the fund is called "growth," "technology," or "S&P 500 total market." If it's tracking US companies and sorting by size, those three names end up near the top.
It's a bit like ordering the "house salad" at three different restaurants and being surprised they all have lettuce. Of course they do — they're all optimizing for the same thing.
QQQ's top 10 holdings make up about 47% of the entire fund. VOO's top 10 sit at roughly 36%. VGT is even more concentrated: its top three names alone — NVIDIA, Microsoft, Apple — are nearly 44% of the whole ETF. Adding it as a "tech play" on top of an existing portfolio usually just amplifies the same names you already own, not a broader swath of tech companies.
"But what about ARKK? That's totally different."
Sometimes it is. ARKK's 2026 holdings have shifted significantly — it's now primarily a genomics and biotech fund, with top positions in Natera, Tempus AI, and 10x Genomics. Very little overlap with QQQ or VOO on the big tech names.
But here's the thing: different isn't automatically safer. ARKK swapped mega-cap tech concentration for genomics-sector concentration. That's a different bet, not a diversified one. The question isn't whether your ETFs hold different tickers. It's whether they'd react differently if markets dropped — or if they'd all fall together because they're all exposed to the same underlying risk.
A lot of the impulse to keep adding ETFs comes from the same place as other portfolio mistakes — chasing what's been working recently. If you've noticed that pull in your own investing, it's worth reading what FOMO does to investment decisions.
What actually diversifies a portfolio
Real diversification means owning things that don't all move in the same direction at the same time.
A few options that genuinely add something different:
Value stocks. ETFs focused on cheaper, older-economy companies — banks, energy, industrials — tend to behave differently from high-growth tech names, especially when interest rates rise. There's very little overlap between a value ETF and QQQ.
International stocks. Companies in Europe, Japan, or emerging markets run on different economic cycles. A bad quarter for US tech doesn't automatically drag down a Japanese manufacturer or a European bank. For more on how different asset types work together, see our piece on stocks vs bonds — how much of each.
Bonds. They won't goose your returns in a bull market, which is exactly why people underweight them. But when equities drop, bonds often don't — or don't drop as hard. That balance matters more the closer you get to needing the money.
What's notably absent from this list: more ETFs that all track the same large US companies with different names.
For a deeper look at whether ETFs make sense versus other structures, see mutual fund vs ETF and active vs passive investing.
How to check if this is happening to you
Three quick moves:
Pull the top holdings of every ETF you own. List them on paper or in a spreadsheet. If the same three to five names keep showing up, you're concentrated — regardless of how many funds you have.
Use a free overlap tool. ETF Research Center (etfrc.com) and Guardfolio let you enter two tickers and see exactly how much they share by weight. Try it on any two funds you own. The result is often surprising.
Look for your brokerage's portfolio analysis view. Most major brokerages have a tab that aggregates all your fund holdings into a single underlying stock list. If NVIDIA or Apple alone represents more than 8–10% of your total portfolio, you're concentrated regardless of how many separate funds it comes through.
If you'd rather not assemble that picture by hand, a portfolio health check does the same read across your connected accounts — concentration, duplicated fees, and idle cash in one view. It's read-only: it shows you what you own, it doesn't touch it.
The fix usually means fewer ETFs, not more
This is the part that surprises people. The answer to overlap is almost never adding a fourth or fifth ETF. It's usually the opposite.
If you own QQQ and VOO: you're paying two expense ratios for roughly the same portfolio. Worth asking whether both are earning their keep, or whether some of that money would be doing more somewhere that genuinely behaves differently.
If you want to reduce your tech concentration: adding a value or international fund actually moves the needle. Adding another growth ETF typically doesn't.
If you have almost no bonds or international exposure: that's probably the actual gap in your portfolio — not the number of ETFs you own.
The goal isn't zero overlap. Some overlap is fine and normal. The goal is knowing what you actually own, so you can decide whether your level of concentration is a deliberate choice or just something that accumulated over time as you added funds.
Conclusion
Five ETFs on your statement can feel like five layers of protection. But if those five funds all circle back to the same ten companies, you've built one bet — just with more logos. That might be fine. It might even be intentional. The part that matters is knowing which one it is.
Want to see where your portfolio actually sits? Ed reads your holdings and shows you your real concentration map — where your money is clustered versus spread, and what's actually doing the same thing twice. Start with the free financial check-up at edwealth.ai, or grab the app (App Store · Google Play) to see how your ETFs add up underneath.
Money at peace. Wealth in motion.
Ed Wealth is a research and self-reflection tool, not a registered investment advisor. Nothing here is financial, investment, or tax advice. The decision is always yours.
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