Stock Markets May 8, 2026 03:20 AM

UK shares slip as Strait of Hormuz clashes rattle markets and weigh on carriers

Escalating US-Iran hostilities push FTSE 100 lower while corporate updates highlight sector-specific pressures

By Jordan Park

British equities retreated on Friday as fresh military confrontations between US and Iranian forces in the Strait of Hormuz unnerved investors. London’s blue-chip FTSE 100 led declines, while energy-related costs and supply disruptions added pressure on airlines. Separately, corporate activity and economic datapoints underscored mixed signals for UK markets.

UK shares slip as Strait of Hormuz clashes rattle markets and weigh on carriers

Key Points

  • FTSE 100 slid 0.81% as investors reacted to renewed US-Iran clashes in the Strait of Hormuz; GBP/USD rose 0.13% to 1.3584.
  • Intertek rejected a £8.93 billion takeover proposal from EQT, citing significant undervaluation and high execution risk; IAG downgraded profit expectations due to soaring jet fuel costs and supply disruptions tied to the Iran conflict.
  • Clariant marginally missed first-quarter adjusted EBITDA forecasts and cited disrupted demand from catalysts customers across the Middle East and Asia; UK house prices fell 0.1% in April, leaving annual growth at 0.4%.

British stocks fell on Friday as renewed military friction between US and Iranian forces in the Strait of Hormuz unsettled market participants. By 03:20 ET (07:20 GMT) the FTSE 100 had slid 0.81%, while sterling held relatively steady, with GBP/USD edging up 0.13% to 1.3584. Across continental Europe, Germany’s DAX declined 1.% and France’s CAC 40 dropped 0.8%.

Tensions intensified after the United States said three destroyers transited the strait while coming under attack from fast boats, missiles and drones, but sustained no damage. In response to the incident, the US president said: "They trifled with us. We blew them away." He also maintained that peace negotiations with Tehran were "going very well" and warned that any refusal by Iran to sign a deal quickly could prompt future military action that would be "a lot harder, and a lot more violently."


UK corporate and economic developments

In corporate news, Intertek turned down a sweetened takeover bid from Swedish private equity firm EQT worth £8.93 billion, saying the offer materially undervalued the product testing company and posed unacceptably high execution risk. The board’s decisive rejection signals confidence in Intertek’s prospects as an independent business despite the sizeable premium that had been proposed.

IAG, the owner of British Airways, warned on Friday that full-year profits would fall short of earlier expectations. The group attributed the revision in part to sharply higher jet fuel costs related to the Iran conflict and attendant supply disruptions, which are now weighing more heavily on earnings than previously anticipated. The downgrade highlights the way the Middle East hostilities are beginning to affect European airlines’ margins.

Housing data from Halifax showed UK house prices edged down 0.1% in April, leaving annual growth at just 0.4%, below economists’ forecasts of 0.6%. The modest decline points to ongoing affordability pressures for British buyers as higher borrowing costs and broader uncertainty damp demand.

Swiss chemicals maker Clariant reported first-quarter adjusted EBITDA of 160.2 million Swiss francs, marginally below analyst forecasts of 162 million. Management said the US-Iran conflict disrupted demand from its catalysts customers across the Middle East and Asia. Clariant preserved its full-year guidance but cautioned that rising input costs and elevated volatility remain headwinds.


Political shift reflected in English local elections

The Labour Party suffered substantial losses in Friday’s English local elections, with Keir Starmer’s party losing ground across traditional strongholds in central and northern England only two years after its national landslide. The principal beneficiary was Nigel Farage’s Reform UK, which captured more than 300 council seats and is positioned to become a significant opposition force in Scotland and Wales.


Market implications

The combination of heightened geopolitical risk and company-specific developments contributed to the downshift in sentiment. Energy and aviation exposures are directly affected by higher fuel costs and potential supply interruptions, while industrial names with Middle East-facing customers have reported demand disturbances. At the same time, domestic housing affordability and political volatility added further texture to the market outlook.

Risks

  • Escalating military hostilities in the Strait of Hormuz that could further disrupt shipping routes or regional supply chains, affecting energy and transport sectors.
  • Rising jet fuel costs and related supply disruptions that are compressing airline profit margins and may lead to further profit revisions among carriers.
  • Elevated input costs and demand volatility for industrial companies with exposure to customers in the Middle East and Asia, which could weigh on near-term earnings.

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