How Much AI Do You Already Own? A 15-Minute Check of Your Index Fund's Real Exposure
"Open every fund you own, find the top ten holdings and their weights, multiply each weight by the share of your portfolio in that fund, and add up the names that repeat. Most people find that a handful of large technology companies make up 20% to 35% of their total equity holdings — a deliberate bet they never actually made.
There is a specific conversation that happens a lot. Someone says they are worried about an AI bubble, so they are staying away from AI stocks. Then they list what they own: an S&P 500 fund, a Nasdaq fund, a technology sector fund and a total world fund.
They own an enormous amount of AI. They just do not know the number.
Here is how to find it. It takes about fifteen minutes and you only have to do it properly once.
Why this is not obvious
Index funds are market-capitalisation weighted. A company that is 100 times larger than another gets 100 times the weight. That is a sensible design, and for most of index investing history it produced portfolios where no single name dominated.
That has changed. The largest companies in the world are now unusually large relative to everything else, and they happen to be concentrated in one theme. A fund holding 500 companies can still have a third of its value in fifteen of them.
You are not doing anything wrong by owning this. You are potentially doing something wrong by owning it without knowing, because you cannot manage a risk you have not measured.
The 15-minute method
Step 1: List every equity fund you own, with its dollar value
Every account. TFSA, RRSP, FHSA, non-registered, 401(k), workplace plan, the old account at the broker you left. Write the fund name and how much is in it.
Then calculate each fund's share of your total equity holdings. If you have $80,000 in equities and $24,000 is in one fund, that fund is 30% of your equity portfolio.
Step 2: Pull the top ten holdings for each fund
Go to the fund provider's product page. There is a Holdings or Portfolio tab, and a downloadable factsheet. Write down the top ten names and their percentage weights.
Do not skip a fund because you assume you know what is in it. Target-date funds, balanced funds and "all-in-one" ETFs hold other funds inside them, so you may need to look one level deeper.
Step 3: Do the multiplication
For each company, in each fund:
Your true weight = (fund's weight in that company) × (fund's share of your equity portfolio)
So if a fund is 30% of your equity and holds 7% in one company, that company is 2.1% of your equity portfolio through that fund.
Step 4: Add up the repeats
Now find every company that appeared in more than one fund and sum its contributions.
Example, using round numbers:
| Fund | Share of your equity | Weight in Company X | Contribution |
|---|---|---|---|
| S&P 500 fund | 40% | 7% | 2.8% |
| Total world fund | 25% | 4% | 1.0% |
| Tech sector fund | 20% | 14% | 2.8% |
| AI thematic fund | 15% | 9% | 1.35% |
| Total | 100% | 7.95% |
That single company is now nearly 8% of your equity portfolio, arrived at entirely by accident. Repeat for the next five names and the picture usually gets uncomfortable.
Step 5: Total the theme
Group the AI-exposed names — chip designers, cloud platforms, the large software companies whose valuations depend on AI adoption — and add their true weights.
That number is your answer. Most people who do this land somewhere between 20% and 35%.
What to do with the number
Nothing, if you are comfortable with it. Plenty of investors look at 25% and decide that is a reasonable reflection of where economic value is being created. That is a legitimate conclusion, arrived at deliberately.
If you are not comfortable, the adjustment depends on where the holdings sit.
Inside a TFSA, RRSP, FHSA or 401(k): selling has no tax consequence. If you own three funds that duplicate each other, consolidating into one broader fund is straightforward and costs you nothing but a few minutes — and with several Canadian brokerages now charging $0 commission on ETF trades, not even that.
Inside a taxable account: selling triggers capital gains. The cheaper approach is almost always to stop adding to the overweight position and direct new contributions elsewhere, letting the concentration dilute over time. Paying tax today to fix a percentage is frequently a worse outcome than fixing it slowly.
Do not fix it by adding more funds. The instinct to solve "too concentrated" by buying another fund usually makes it worse, because the new fund holds the same names. Fewer, broader funds is the fix; more, narrower funds is the disease.
Two structural options if you want less concentration
Add international deliberately. Non-US developed and emerging market funds have very different top-ten holdings. Note the caveat: Korea's index is itself dominated by two semiconductor companies, so "international" is not automatically "less AI."
Consider an equal-weight version of an index. These give every constituent the same weight, which removes megacap dominance. The costs are a higher expense ratio, more turnover, and a return profile that lags when large companies lead. It is a real tool with real trade-offs, not a free lunch.
Do this again in a year
Concentration drifts upward on its own. If a group of holdings outperforms, it becomes a bigger share of the portfolio without you buying a single additional share. A 20% theme weight that performs well becomes a 30% theme weight in two good years.
That is why an annual check matters more than a one-time fix — and why setting a rebalancing rule in advance beats making a judgement call in the middle of a market you have feelings about.
Frequently asked questions
Where do I find my ETF's holdings?
Every fund provider publishes a full holdings list on the product page for each fund, usually under a tab labelled Holdings or Portfolio, and often as a downloadable spreadsheet updated daily or monthly. You can also find the top ten holdings in the fund's factsheet, a two-page PDF linked from the same page. If you cannot find it, that itself is worth noting — transparency of holdings is one of the basic advantages of an ETF over a mutual fund.
What is a normal concentration for the top ten holdings?
It depends entirely on the index. A total world equity fund holding thousands of companies has historically had a lower top-ten weight than an S&P 500 fund, which in turn is lower than a Nasdaq-100 fund. The important comparison is not against an absolute benchmark but against what you assumed: if you believed owning four funds meant broad diversification and the same six companies dominate all four, the number is too high for your own expectations regardless of what any benchmark says.
If I am too concentrated, what do I actually do about it?
Usually less than people expect. Selling inside a registered account like a TFSA or RRSP has no tax consequence, so if you hold overlapping funds there, consolidating is straightforward. In a taxable account, selling triggers capital gains, so the cheaper adjustment is to direct new contributions toward the underweight parts of the portfolio and let the concentration dilute over time rather than paying tax to fix it immediately.
Does equal-weight fix concentration?
Partly. An equal-weight version of an index gives every company the same weight regardless of size, which removes the dominance of the largest names. The trade-offs are a higher expense ratio, more turnover, a structural tilt toward smaller companies within the index, and a different return profile — it underperforms when large companies lead and outperforms when they lag. It is a legitimate tool, not a free fix.
Primary sources
Data & disclaimer: This article is for educational purposes only and is not financial or investment advice. Figures reflect data available as of Sep 10, 2026, and conditions change — always confirm current pricing, rates and rules with the provider before you act. Written by Elizabeta Dimoska. See our editorial standards and disclosure.
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