Hedging The Currency On A Foreign Book

A US-based fund buys a German industrial stock. The stock rises 8% in euro terms over the quarter — a good result on paper. But if the euro fell 6% against the dollar over the same period, the fund's actual dollar return is closer to 2%, because converting the euro proceeds back to dollars happened at a worse exchange rate than when the position was opened. Every foreign holding is really two bets stacked on top of each other: a bet on the asset, and a bet on the currency it's priced in. Hedging FX means deciding whether you want that second bet at all.

Separating the two exposures

The currency exposure on a foreign book is usually close to the market value of the position itself — if you own €10m of German stock, you're effectively also short $10m-equivalent of dollars against euros, whether you meant to take that position or not. This is hedged using forwards or futures on the currency pair, sized to roughly offset the foreign-currency market value: sell euros forward against dollars in an amount matching the position, so a euro decline that hurts the dollar value of the stock is offset by a gain on the forward.

The catch is that the market value of the foreign position moves too, so a static hedge sized on day one drifts out of alignment as the stock price changes — a stock that doubles in euro terms now has twice the currency exposure the original hedge was sized for, and needs rebalancing.

Worked example

A fund holds €10m of a German stock, translated at $1.10/€ into roughly $11m of currency exposure. It sells €10m forward against dollars to hedge. Over the quarter the stock rises to €10.8m in value and the euro falls to $1.05. Unhedged, the position would be worth $10.8m \times 1.05 = $11.34m — barely above where it started despite an 8% local gain, because the currency move ate most of the return. With the forward hedge in place (sized on the original €10m, now slightly under-hedged given the stock's gain), most of that currency drag is offset, leaving the fund's dollar return much closer to the stock's actual local-currency performance.

What this means in practice

Whether to hedge FX at all is a house decision, not just a mechanical one — some funds hedge every foreign position by policy, others leave currency exposure on deliberately as a diversifying return source, and others hedge selectively based on a currency view. What matters is that the decision is made on purpose. Leaving currency exposure on by default, simply because nobody thought about it, is the version of this risk that causes the most avoidable surprises.