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’

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.

As Jack said: “It is unusual for a senior figure at the Bank to be so forthright on market movements.” With confidence fluctuating around peace talks, and reverberations in energy markets continuing, what has gone up could just as easily come down.

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“Nothing, it seems, can dent the almost inexplicable optimism coursing through financial markets,” said the ABC’s chief business correspondent Ian Verrender. In the past, stock markets would “shudder” and “tumble”, then spend a decade recovering from economic “calamity”; nowadays the recovery time is cut down to weeks, “if they bother to react at all”.

Investors are not “oblivious” to what is happening in the world, said Joe Rennison, financial markets reporter for The New York Times. They are just attuned to “what exactly the markets are measuring”, looking beyond the “immediate upheaval from the war” to concentrate on its “long-term effects on corporate profits”. Americans may be struggling to afford fuel for their cars, but companies have been “very profitable indeed” for “quite a while now”. Big tech is “riding a wave of enthusiasm”, and it is these bigger companies, like Microsoft and Meta, who have been shielded from the war and tend to influence the market more profoundly.

Although the market “rapidly rebounded – and then some” after Trump’s ceasefire announcement, having been on a steady slide for most of March, investors are “not simply taking Trump at his word” that the war is “almost over”. Instead, they are responding to the White House’s “apparent eagerness” to find an end to the combat. “Investors might not believe Trump, exactly, but they do seem to believe that the worst of the war has already passed.”

After “years of headline-driven volatility” and a “dip-buying mindset”, investors have learned not to “stay bearish for too long”, said Bloomberg. The current pattern echoes the “Ukraine-war playbook from early 2022, when an initial equities sell-off and commodity price surge” soon reversed to normal.

“It is never easy to price uncertainty,” said Tej Parikh in the Financial Times. Investors have long relied on “ebitda”, or earnings before interest, taxes, depreciation and amortisation, to ascertain the “core value of a business”. But it now appears they have changed their tune, relying on “earnings before Iran, tariffs and dubious announcements”.

Since the war in Iran began, analysts have “actually raised their expectations for upcoming profits” for S&P 500 companies, said The Associated Press. Major companies such as PepsiCo and GE Vernova have either “stuck by” or “raised” their revenue forecasts for the year, which were initially published before the start of the war. S&P 500 profits could “accelerate to 20% in the second quarter, and companies aren’t giving them many reasons to reconsider”.

Of course, the US stock market “can easily return to falling”. If US-Iran peace talks break down, or if oil supplies cause greater concern, Wall Street’s mood could “swing quickly back to fear”. If oil prices, in particular, stay elevated for long enough, that could “erode” profits and raise costs, not to mention “weaken the spending power” of consumers around the world.

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.