Stock Markets April 28, 2026 03:13 AM

FTSE 100 Opens Lower as Trump Rejects Iran Offer and Hormuz Disruption Keeps Oil Markets Nervous

Persistent uncertainty over reopening the Strait of Hormuz and a U.S. naval blockade weigh on London stocks; BP reports a refinery unit shutdown amid wider market caution

By Maya Rios BP
FTSE 100 Opens Lower as Trump Rejects Iran Offer and Hormuz Disruption Keeps Oil Markets Nervous
BP

British equities started the trading day under pressure as reports that the U.S. was unsatisfied with Iran's proposal to reopen the Strait of Hormuz heightened concerns over continued disruption to oil flows. Crude markets priced in tighter supply after news of a collapsed Pakistan-mediated negotiation and an ongoing U.S. blockade. UK corporate and economic headlines were mixed, including a BP refinery unit shutdown, a major VC-backed funding round for a tech firm, and shifts in consumer inflation expectations.

Key Points

  • FTSE 100 opened down 0.10% while sterling weakened to 1.3506 against the dollar; Germany's DAX fell 0.4% and France's CAC 40 dropped 0.3% - impacting broad equity markets.
  • Reports that Washington was unhappy with Iran’s proposal to reopen the Strait of Hormuz, combined with a U.S. naval blockade, have kept oil flows constrained and supported crude prices - affecting energy and commodity-sensitive sectors.
  • UK-specific developments included a BP refinery unit shutdown at Whiting, Indiana, a $1.1 billion seed funding round for Ineffable Intelligence, and shifts in consumer inflation expectations - relevant to energy, tech, and retail sectors.

Market open and moves

UK stocks opened marginally lower on Tuesday, reflecting investor caution around fragile U.S.-Iran talks and ongoing constraints to oil shipments through the Strait of Hormuz. At 03:13 ET (07:13 GMT) the FTSE 100 was down 0.10%. Sterling weakened against the dollar, trading at 1.3506. In mainland Europe, Germany's DAX retreated 0.4% and France's CAC 40 eased 0.3%.

Diplomatic impasse keeps oil markets on edge

Market participants remained wary after reports suggested the U.S. was dissatisfied with Tehran's plan to reopen the strategic shipping lane, in part because the proposal postpones talks over Iran's nuclear program. The U.S. has kept a naval blockade in place, leaving the Strait of Hormuz effectively closed and constraining oil flows. Crude prices stayed supported as traders priced in a tighter supply picture following the reported collapse of Pakistan-mediated negotiations over the weekend.

Although an indefinite ceasefire reportedly remains in effect, both sides appear reluctant to enter direct negotiations. That dynamic increased the prospect of a prolonged diplomatic stalemate, contributing to risk-off positioning in equity markets sensitive to energy-price shocks.

UK roundup - corporate and economic headlines

  • BP reported that a brief power outage at its Whiting, Indiana refinery forced the shutdown of one processing unit.
  • Ineffable Intelligence raised $1.1 billion in a seed funding round led by major U.S. venture capital firms, with participation from the British government.
  • Rachel Reeves is facing pressure from a House of Lords committee to pursue a reduction in public debt within three years.
  • Retail activity around Easter - including promotions on chocolate, home improvement goods and clothing - helped to ease shop price inflation in April.
  • A consumer group filed a legal challenge against the £9.1 billion motor finance compensation scheme, a move regulators criticized.
  • Inflation expectations among UK consumers declined in April, according to a YouGov survey conducted for Citigroup.

Investor implications

The combination of unresolved diplomatic talks, a continued naval blockade limiting oil flows, and mixed UK domestic news left investors taking a cautious stance in early trading. Energy markets are particularly sensitive to the developments in the Strait of Hormuz, while the corporate items in the UK roundup - including the temporary refinery shutdown and the large venture funding round - add idiosyncratic noise for specific sectors.


Note: Times and percentage moves are those reported at 03:13 ET (07:13 GMT) on the day in question.

Risks

  • Prolonged diplomatic stalemate between the U.S. and Iran could keep the Strait of Hormuz effectively closed, sustaining downside pressure on oil supply and raising costs for energy-intensive industries.
  • Continued naval blockade and constraints on oil shipments introduce volatility to crude markets, which could spill over into equity markets and affect companies with high commodity sensitivity.
  • Legal and fiscal policy uncertainties in the UK - including the legal challenge to the £9.1 billion motor finance compensation scheme and calls to reduce public debt within three years - may create policy and regulatory headwinds for financial and consumer-facing sectors.

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