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Sterling nudges higher as US and Iran agree on preliminary deal

Published by Global Banking & Finance Review

Posted on June 15, 2026

3 min read

· Last updated: June 15, 2026

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Sterling Edges Up Following US-Iran Preliminary Deal Amid Market Caution

Market Reactions and Economic Implications

By Sophie Kiderlin

Sterling and Dollar Movements Post US-Iran Deal

LONDON, June 15 (Reuters) - Sterling inched higher against the U.S. dollar on Monday after the U.S. and Iranian officials said they had reached a preliminary agreement to end their war and reopen the Strait of Hormuz.

Details of the US-Iran Agreement

The memorandum of understanding is scheduled to be officially signed on Friday in Switzerland. Precise terms were not immediately known, and questions remained about the fate of Tehran's nuclear program, which has been a key issue in negotiations. 

Oil Prices and Risk Appetite

Oil prices fell on Monday, with Brent crude futures last down around 5.3% to $82.75 per barrel, and demand for riskier assets picked up. Yet, the market reaction to the prospective deal appeared somewhat cautious - the U.S. dollar was last steady on the day against a basket of its major peers at 99.52, hovering around its lowest since June 5.

Expert Commentary

"FX market participants will heave a sigh of relief and watch for any signs of this deal breaking down," Kit Juckes, chief FX strategist at Societe Generale, said in a note. 

Sterling and Euro Performance

The pound, which is seen as a risk-sensitive currency, was last 0.15% higher against the dollar at $1.3426. The euro was last up 0.22% against the pound at 86.43 pence. 

Upcoming Economic Data and Political Events

Key Economic Indicators

ECONOMIC DATA

As the week continues, sterling will have a flurry of economic data to contend with - inflation figures, labour market data and retail sales are all due. 

Bank of England Decision

The Bank of England's latest interest rate decision will meanwhile come Thursday. Policymakers are expected to leave rates unchanged then, but markets will be watching closely for any comments about the potential policy path ahead.

Money markets were last pricing in one quarter-point rate hike from the BoE this year after paring back expectations for tighter policy in recent days. 

Political Developments: Makerfield By-Election

Also on Thursday, markets will be following the crucial Makerfield by-election, which could pave the way back to Westminster for Greater Manchester Mayor Andy Burnham, the candidate of the governing Labour Party. A Burnham win could ignite a party leadership battle that might see him replace Prime Minister Keir Starmer. 

Potential Impact on Sterling

Political uncertainty and worries over what a leadership change may mean for UK fiscal policy are widely regarded as a potential risk for sterling. 

"We are still bearish on sterling on the back of the political developments we think are coming in the near term," Nick Rees, head of macro research at Monex Europe, said, noting that a leadership challenge to Starmer may come quite soon should Burnham win the by-election. 

(Reporting by Sophie Kiderlin; Editing by Alison Williams)

Key Takeaways

  • U.S.–Iran framework reached: 60‑day ceasefire extension, Strait of Hormuz reopening, talks to follow; signing set for Friday in Switzerland (axios.com)
  • Oil prices dropped sharply — Brent down ~4–5% to mid‑$80s per barrel — reflecting easing geopolitical risk (investing.com)
  • Sterling modestly stronger on risk appetite; BoE rate decision, inflation and UK politics (Makerfield by‑election) pose risks to pound’s outlook (investing.com)

References

Frequently Asked Questions

Why did sterling rise against the US dollar?
Sterling rose after news of a preliminary agreement between the US and Iran to end hostilities and reopen the Strait of Hormuz, which boosted demand for riskier assets.
How did oil prices react to the US-Iran agreement?
Oil prices fell, with Brent crude futures dropping around 5.3% to $82.75 per barrel following the announcement of the preliminary deal.
What economic data is the UK expecting this week?
The UK is expecting inflation figures, labour market data, retail sales data, and the Bank of England interest rate decision.
What is the market expectation regarding Bank of England interest rates?
Markets expect the Bank of England to leave rates unchanged, though one quarter-point hike is still priced in for this year.

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