Why the name is not the fund — read the holdings instead
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Open two AI ETFs side by side and they may share fewer than half their holdings. The same label does not mean the same contents.
Theme boundaries are a judgement call
Where does an AI company stop? Chipmakers, model builders, businesses deploying it, utilities powering the data centres — each cut-off produces a different fund.
The index provider draws that line, and providers draw it differently. Same theme on the label, different companies inside.
Which is why thematic funds have to be read through their rules and holdings, not their names.
The weighting changes the character
Even with identical holdings, a different weighting scheme makes a different product.
Cap weighting puts the mass in the largest companies. Equal weighting hands the same slice to the smallest, pulling the fund toward mid and small caps. Capped schemes trim whatever grows past the limit.
When two similarly named funds diverge, the weighting is usually the reason rather than the holdings.
Things the name did not mention
A fund with "US" in its name can hold companies headquartered elsewhere, because some indices classify by listing venue rather than domicile.
And large caps with only a loose connection to the theme sometimes sit near the top, having satisfied the rulebook if not the investor's expectation.
Scanning the top 10 surfaces both quickly.
The order to check in
Start with the top 10 holdings: are the companies you had in mind actually there, and is anything unexpected carrying real weight?
Then the combined weight of those ten. If it is high, you are largely buying those names.
Finally, check it against ETFs you already own. Different names with the same leaders is not diversification — it is the same bet, twice.
Same name, different basket
Open two funds both called 'battery' and they can share less than half their holdings — one weighted to cell makers, the other to cathode and separator materials. Same industry, different definition.
'AI' is worse. Chip designers only, or data centres and power equipment too, or mostly software companies — all under one label. There is no settled boundary, so each index draws its own.
Judge a thematic fund by its inclusion rule, not its name. If you cannot find the rule, read the top ten holdings: those ten are the product's definition of the theme.
Why unrelated names appear
Inclusion rules usually key off revenue share or industry classification, so a company that looks unrelated can qualify simply because one division crossed a threshold.
Funds labelled 'US' can hold non-US companies for the same reason. If the index screens by listing venue, anything listed there counts regardless of headquarters.
That does not make the product wrong — it followed its rule. It may still differ from what a buyer expected, which is why the check has to be done directly.
A three-minute check
First, the top ten and their combined weight. Above roughly 70% and you are buying those ten.
Second, the sector mix. Confirm the industry in the name is actually the largest sector. If it is not, the label and the contents disagree.
Third, overlap with what you already own. Put the candidate into the deep-scan with your existing funds and see, name by name, what it adds. If it adds nothing, there is no reason to buy it.
This article is general information, not investment advice. Investment decisions and responsibility are your own.