When Global Investing Becomes a Dollar Call

Investors increasingly think about diversification across asset classes, regions and sectors. Equities versus bonds. The US versus Europe. Technology versus healthcare. Growth versus income.

But another exposure sits within many portfolios and receives far less attention. Currency.

For a UK investor, a portfolio can appear geographically diversified while remaining heavily influenced by a single currency — the US dollar.

That matters because the investor’s return is not simply the performance of the underlying asset. It also includes the effect of translating that return back into sterling.

A US share can rise in dollar terms but deliver a much smaller gain to a UK investor if the dollar weakens. Conversely, even a modest return from the underlying asset can be enhanced if sterling falls against the dollar.

Currency is therefore not merely a technical footnote. It can be a meaningful driver of total return.

Global by label, dollar by exposure

This issue has become increasingly relevant as global equity markets have grown more heavily weighted towards the United States.

At the end of June, the largest constituents of the MSCI ACWI Index were dominated by US mega-cap technology and AI-related businesses, including Nvidia, Apple, Microsoft, Amazon, Alphabet, Broadcom, Micron and Meta.

The MSCI World Index tells a similar story. Its largest holdings include many of the same companies, while information technology represents just over 30% of the index.

That does not make these poor investments. Many are exceptional businesses with significant earnings power and exposure to genuine structural growth.

But it does mean that investors may be making several related investment decisions at once: allocating to US equities, accepting US growth valuations, relying on continued American technology leadership and retaining exposure to the US dollar.

The portfolio may be global by label, but its underlying return drivers can be more concentrated than investors realise.

The dollar outlook is contested

The outlook for the dollar is not one-sided, although the balance of opinion appears to lean towards medium-term weakness.

Morgan Stanley expects the dollar to remain relatively weak against its peers during the second half of 2026, citing moderating US core inflation, changing interest-rate expectations and resilient global risk appetite.

Goldman Sachs also expects further dollar weakness as demand for US assets moderates.

J.P. Morgan Asset Management believes investors should pay greater attention to currency exposure across asset classes. It argues that the dollar’s trajectory has “definitively turned” following a 14-year bull market and estimates that, despite its recent decline, the currency remains around 7% above fair value against the euro and 8% above fair value against sterling.

UBS reaches a broadly similar structural conclusion. It identifies the US fiscal and current-account deficits, substantial global allocations to dollar assets and changes in Federal Reserve leadership as potential long-term headwinds.

But this is not exclusively a bearish-dollar story.

J.P. Morgan Global Research became more positive on the currency earlier this year and expects it to remain relatively firm through year-end. Near-term conditions could also remain supportive under several scenarios.

Geopolitical uncertainty has traditionally increased demand for dollar assets. Higher oil prices could complicate the US inflation outlook and delay monetary easing. Continued US economic resilience could also preserve the interest-rate advantage available on dollar assets.

In other words, the dollar could still provide a tailwind.

For a sterling investor, unhedged US assets may benefit if the dollar appreciates against the pound. That could occur if US growth remains stronger than expected, inflation keeps the Federal Reserve more restrictive than markets anticipate, or geopolitical risk drives capital towards traditional safe-haven assets.

But a tailwind is still an exposure and exposures should be understood.

Currency can diversify — or concentrate

Historically, dollar exposure has often helped international investors during periods of market stress.

J.P. Morgan Asset Management notes that, since the global financial crisis, the dollar has frequently been negatively correlated with the S&P 500. Dollar strength has therefore sometimes offset part of the decline in equity markets.

However, it also questions whether this safe-haven relationship will remain as dependable if US economic or political policy itself becomes the source of market instability.

That distinction matters.

Currency can diversify a portfolio. It can cushion losses and enhance returns.

But it can also amplify an existing concentration.

If a portfolio already depends heavily on US earnings, US valuations and US technology leadership, adding unhedged dollar exposure may not always provide meaningful diversification. In some environments, it may simply represent another expression of the same US-centric investment position.

This is particularly important in defensive portfolios.

The return from an overseas bond can differ substantially depending on whether its currency exposure is hedged. An unhedged global bond portfolio may ultimately be driven less by duration, yield and credit quality than by movements in foreign exchange markets.

An investor may believe they have purchased defensive fixed-income exposure when, in practice, a significant part of the outcome depends on the direction of sterling.

BlackRock’s 2026 midyear outlook makes a related point: investors increasingly need to look beyond traditional asset-class labels and identify the underlying exposures actually driving portfolio performance.

The MGTS Qualis Funds view

At Qualis, we are not suggesting that investors should abandon the dollar.

It remains the world’s dominant reserve currency, and US assets will continue to occupy a central position in global portfolios.

Nor are we making a short-term currency forecast. Foreign-exchange markets are notoriously difficult to predict, and there are credible arguments supporting both a stronger and a weaker dollar.

Our point is simpler:

Investors should know when they own the dollar.

A global equity fund, a US technology fund, a global bond fund and a multi-asset strategy may appear to provide considerable diversification.

But if each carries substantial exposure to the same currency, the same market and the same macroeconomic assumptions, the resulting diversification may be less effective than it first appears.

The next stage of portfolio construction may therefore require investors to ask a more precise question.

Not simply, “am I globally invested?”

However, “what is actually driving my return?”

Sometimes the answer will be earnings growth. Sometimes valuation. Sometimes duration or credit spreads.  And sometimes, more than investors realise, it will be the dollar.

When global investing becomes a dollar call, currency exposure stops being a footnote.

It becomes part of the investment decision.

This article is for information only and does not constitute investment advice or a personal recommendation. Capital is at risk, and the value of investments can fall as well as rise.