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UK Stocks Outperform US, But Iran War Threatens Gains

London-listed equities have outperformed U.S. markets in 2025, driven by defensive sectors and strong cash returns. However, this positive trend is threatened by the ongoing conflict in Iran. The UK's status as a net energy importer makes it particularly vulnerable to volatile global energy prices, which have risen sharply due to the conflict. Furthermore, UK inflation jumped to 3.3% in March amid rising fuel costs. Analysts note that while the UK market offers defensive ballast, the US is currently seen as more insulated from energy shocks, leading to recent performance divergence.

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UK Stocks Outperform US, But Iran War Threatens Gains

London-listed equities have shown strong outperformance against U.S. markets in 2025, yet this momentum faces headwinds due to the ongoing conflict in Iran. The FTSE 100 index has posted significant gains, but vulnerabilities related to global energy prices and inflation are becoming apparent.

FTSE 100 Performance and Appeal

The FTSE 100 index, representing the UK's leading companies, gained approximately 5.3% in 2025, surpassing the major indices of Wall Street. This strong performance built upon an even more substantial surge of 21.5% recorded in 2025.

Investors point to several structural advantages in the UK market:

  • Defensive Sectors: A significant portion of the index's market capitalization and earnings derive from resilient sectors such as mining, energy, utilities, and consumer staples.
  • Geopolitical Hedge: These characteristics position the UK market as a potential hedge against geopolitical risks and supply chain disruptions, especially given high oil and stable gold prices.
  • Cash Returns: The market offers lucrative cash returns through dividends, special payouts, and buybacks. In 2025, total cash returned was around £180 billion, with 2026 forecasts suggesting a total of £130 billion, representing a 4.6% yield on total market cap.

Emerging Risks and Divergence from US Markets

Despite the positive outlook, the UK market faces structural weaknesses and immediate risks stemming from the Iran conflict.

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Energy Vulnerability

  • The UK is a net energy importer, sourcing about 40% of its fuel from overseas, making it highly susceptible to global energy price volatility.
  • The conflict has caused surges in oil and gas prices due to the disruption and closure of key infrastructure, such as the Strait of Hormuz.
  • In contrast, the US is viewed as more insulated from energy shocks due to its status as a net energy exporter.

Inflation and Market Performance

  • UK inflation rose to 3.3% in March, directly linked to surging fuel costs following the escalation of the Iran conflict.
  • Since the war began in late February, U.S. indexes have outperformed the FTSE 100, a shift noted by market analysts.

Market Structure and Global Exposure

While the UK market has historically underperformed compared to the US, proponents argue that its global nature mitigates domestic concerns:

  • A substantial portion of listed companies are headquartered outside the UK or operate globally.
  • As much as 75% of FTSE 100 earnings are generated from overseas operations, suggesting a degree of insulation from purely domestic economic turbulence.
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