How Would Markets React to a US Strike on Iran?

With a US attack on Iran expected to possibly happen in the coming weeks, here are a few scenarios as to how markets could react:

Base Case: limited strike, no major supply disruption

If markets begin to seriously price in a US strike on Iran within the next couple of weeks, the reaction will depend far more on the scale and consequences of the action than on the political narrative itself. In a limited-strike scenario, where military action is targeted and does not materially disrupt Iranian oil exports or shipping through the Strait of Hormuz, the immediate response would likely be a spike in oil prices, potentially $5–10 higher on headline risk alone.

Safe-haven assets such as gold and the US dollar would probably strengthen, while equities could see a short-term sell-off, particularly in Europe and emerging markets. However, if energy flows remain intact, markets would likely stabilise relatively quickly, with oil retracing part of its gains once it becomes clear that no sustained supply shock has occurred.

Escalation Scenario: disruption to Hormuz or regional infrastructure

The more disruptive scenario would involve escalation that affects oil infrastructure or shipping lanes, particularly the Strait of Hormuz, through which roughly one-fifth of global supply transits. Even temporary disruption could push Brent toward the $90–100 range, sharply lifting inflation expectations and creating volatility across asset classes.

Equities would likely face a deeper correction, with energy stocks outperforming while airlines, transport and consumer cyclicals come under pressure. Bond markets might initially see a flight-to-safety bid, though sustained higher oil prices could later lift yields if inflation risks rise. In this environment, central banks would face a difficult trade-off between managing inflation and supporting growth.

Contained but prolonged tension

Even without immediate military action, prolonged uncertainty alone can sustain a geopolitical risk premium. Markets tend to struggle most with shifting probabilities and unclear timelines, which can keep oil supported, elevate implied volatility and encourage cautious positioning.

The key question for investors is not whether a strike occurs, but whether it leads to a genuine supply shock. A contained event is absorbable; a sustained disruption to energy flows would have much broader macro consequences, potentially complicating rate-cut expectations and increasing the risk of a stagflation-style repricing across global markets.

Daniela Hathorn
Senior Market Analyst
capital●com

For more market insights, please visit: https://capital.com/en-gb/analysis/daniela-hathorn

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