Look-Through Currency Exposure: Why an ETF's Trading Currency Is Not Its Risk

Published 30 October 2026 by Steffan Kharmaaiarvi, founder

Ask a client which currencies they hold and they will usually answer with the currency on their statement. A British client with London-listed ETFs sees pounds; a Canadian client with TSX-listed funds sees Canadian dollars. Both may hold mostly US dollars. For a client who will spend in another currency, after retiring abroad or a move already planned, the gap between the statement currency and the underlying exposure is one of the more consequential things a review can show.

Trading currency and underlying currency

• Trading currency is the currency a fund is quoted and settled in on an exchange. It follows the listing, not the contents.
• Underlying currency is the currency of the assets the fund holds. An S&P 500 tracker is US dollar exposure whether it trades in USD in New York, in GBP in London or in CAD in Toronto.
• A hedged share class carries mainly the exposure of its hedge currency: a GBP-hedged class of a global bond fund behaves largely like a sterling asset. Small differences remain from how the hedge is run.
• An individual share is priced in its trading currency, even when the company earns most of its revenue elsewhere.

A fund's base currency, its share-class currency, its trading line and its hedge currency are four different things, and a fund name with "GBP" in it can refer to any of them. The issuer's own documents settle it: the fund page and factsheet give the currency or country breakdown of the holdings, as on iShares' page for its S&P 500 UCITS ETF.

A worked example

A UK client with a £500,000 portfolio, all in London-listed funds trading in sterling, is planning a move to Spain and will spend in euros. The fund weights below are illustrative, not any particular fund's breakdown:

By trading currency the portfolio is 100% sterling. Looked through, it is 61% US dollars (£305,000), 21.2% sterling (£106,000), 3% euros (£15,000), 1.5% yen, 3.3% other currencies and 10% not modelled. Against the euros the client will spend after the move, 3% of the portfolio matches, 87% is in other currencies and 10% is unknown. Whether that is appropriate is a judgement for the adviser and client; many long-horizon investors accept currency exposure in equities. The point is that the client sees it before the move, not after.

What to settle with the client

• Which currency will they spend in over the next five to ten years, and does that change with a planned move or retirement abroad?
• Which known costs ahead, such as a property purchase or school fees, are fixed in a particular currency?
• Which holdings are hedged share classes, and to which currency? The answer is on the fund's documents, not the platform's label.

Common mistakes

• Reading the statement currency as exposure. The statement shows how the holding is priced, not what it holds.
• Reading a currency in the fund name as a hedge. "GBP" may only be the trading line of an unhedged fund.
• Guessing an unknown fund. Inferring exposure from a fund's name or index looks precise and is not; an honest "unknown" is more useful.
• Treating a home listing as home exposure. A London listing of an Irish fund of US shares is still US dollars.
• Forgetting the bonds. Unhedged foreign bonds carry currency risk that can outweigh their yield.

How Borderfolio for Advisors handles it

• Two views. Allocation by currency can be shown by trading currency or by underlying currency.
• A sourced catalogue. The underlying view uses a catalogue of common ETFs built from issuer documents (iShares, Vanguard, State Street, DWS and others). Each fund's breakdown is shown with its date and a link to the source.
• Hedged classes and shares. A hedged class counts as its hedge currency; a share counts in its trading currency.
• Unknown stays unknown. A fund outside the catalogue appears as "Not modelled", with its share of the portfolio. It is never guessed.
• Against the move. When the client has a planned move in their relocation plan, the Cross-Border currency finding compares the looked-through exposure with the currency the client will spend after the move. Planning a client's relocation covers the rest of that file.

Where it stops

• The catalogue covers common ETFs, not every fund, and issuer breakdowns change after the date shown.
• Where an issuer publishes only a country breakdown, countries are mapped to their currencies, which is an approximation.
• Companies' own revenue exposure and the effectiveness of a hedge are not modelled. No hedging is recommended and no exchange rate is forecast.

Frequently asked questions

Is a GBP-listed S&P 500 ETF a sterling investment?

No. Its price is quoted in pounds, but it holds US shares, so its value moves with the US dollar. Its underlying currency exposure is US dollars unless the share class is hedged.

How should a currency-hedged share class be counted?

As exposure to its hedge currency, because the hedge offsets most of the movement of the underlying currencies against it. Small residual differences remain from how the hedge is run.

What does Borderfolio do with a fund it cannot look through?

It shows that part of the portfolio as not modelled, with its share. It does not infer an exposure from the fund's name or index.