Why are stock markets surging despite Iran crisis?

All-time share-price highs reveal an ‘inexplicable optimism’, but fears of collapse due to US-Iran volatility are keeping bankers ‘awake at night’

Photo composite illustration of the New York Stock Exchange, destruction in Iran and an MXWD Index graph
‘Investors might not believe Trump, exactly, but they do seem to believe that the worst of the war has already passed’
(Image credit: Illustration by Stephen P. Kelly / Getty Images)

The S&P 500, the benchmark US stock index, hit a record high on Wednesday. This is being mirrored in other major stock markets across Asia and Europe, despite growing concerns over global fuel and energy prices as a result of the war in Iran and the blockage of the Strait of Hormuz.

“There’s a lot of risk out there and yet asset prices are at all-time highs,” Sarah Breeden, deputy governor of the Bank of England, told the BBC’s business editor Simon Jack. “We expect there will be an adjustment at some point”, she said. What “really keeps me awake at night is the likelihood of a number of risks crystallising at the same time”.

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Will Barker joined The Week team as a staff writer in 2025, covering UK and global news and politics. He previously worked at the Financial Times and The Sun, contributing to the arts and world news desks, respectively. Before that, he achieved a gold-standard NCTJ Diploma at News Associates in Twickenham, with specialisms in media law and data journalism. While studying for his diploma, he also wrote for the South West Londoner, and channelled his passion for sport by reporting for The Cricket Paper. As an undergraduate of Merton College, University of Oxford, Will read English and French, and he also has an M.Phil in literary translation from Trinity College Dublin.