May 2026

May was the month markets priced the Middle East as negotiable. After two months dominated by confrontation between the US and Iran, investors began to treat diplomacy as the more likely path. Oil gave back a large part of its war premium, volatility fell and equities rallied hard. The crisis had not gone away; markets simply stopped pricing the worst case.

Trump’s pressure on Iran remained the central geopolitical story. The tone shifted from imminent escalation towards negotiation, but not in a clean or orderly way. Every rumour of talks, ceasefires or concessions moved prices. The Strait of Hormuz stayed at the centre of the trade. A serious disruption would still threaten global energy supply, shipping costs and inflation, but May’s price action suggested investors were no longer braced for that outcome. The market was not calm. It was less frightened.

That shift hit oil first. Brent fell 10.7% and WTI dropped 14.4%, reversing part of the surge built up during the earlier phase of the Iran crisis. Traders removed some of the risk premium attached to supply disruption and returned to the harder questions of demand, inventories and global growth. Lower crude also changed the inflation conversation. It did not remove the threat of another price shock, but it gave markets room to breathe after a brutal March and April.

The economic picture looked better as oil prices fell. The underlying growth story did not change dramatically over the month. Europe still faces weak productivity, sluggish manufacturing activity and patchy consumer demand. China continues to rely on selective support rather than a broad and convincing recovery. Yet lower crude changed the direction of the discussion. Investors who had spent the previous two months worrying about another energy-led inflation shock were suddenly willing to talk about disinflation again. Markets do not need perfect data to rally. They need the news flow to become less threatening.

Central banks had no reason to rush. The Fed stayed cautious, with progress on inflation offset by the danger of moving too early. The same tension ran through Europe and the UK. Policymakers were not declaring victory, but falling oil made the debate easier. The risk of renewed inflation had not disappeared, but it no longer looked as immediate as it had when crude was surging. Investors did not need imminent rate cuts. They needed confirmation that policy was unlikely to tighten again. May gave them enough.

Equities took the opening quickly. The S&P 500 rose 5.1% and the Nasdaq surged 8.4%, with large-cap technology and artificial intelligence themes back in control. Strong earnings, AI spending and a calmer rates picture gave investors permission to buy the same parts of the market that have dominated much of the cycle. The rally was not subtle. When oil fell and volatility eased, capital went straight back to the preferred trade.

Japan was stronger still. The Nikkei 225 climbed 11.9%, helped by continued international demand, governance reform, shareholder returns and support for exporters. Japan has become one of the more convincing developed-market equity stories, particularly when investors want exposure outside the US without abandoning liquidity or earnings momentum. The move also showed how quickly global money still chases markets where the reform story, currency backdrop and corporate behaviour point in the same direction.

Europe joined in, albeit more muted. The Dax gained 3.3%, helped by the easing in energy fears and the broader improvement in risk appetite. The FTSE 100 rose only 0.3%, held back by its defensive and energy-heavy composition. That underperformance made sense. A falling oil price helps the macro story, but it does little for an index with meaningful commodity exposure. The UK market looked steady rather than exciting.

China’s Shanghai Composite rose 4.6%. That was not a declaration that investors had rediscovered faith in China. It was a lower bar being cleared. Policy support, signs of stability and the absence of another deterioration were enough to bring some buyers back. Structural concerns remain plain enough, from property weakness to weak private-sector confidence, but May showed that Chinese equities can still rally when the news flow stops getting worse.

Commodities carried the contradiction of the month. Oil fell sharply, yet the Bloomberg Commodity Index still rose 1.5%, helped by strength elsewhere. Gold slipped 2.6% as haven demand faded and investors moved back into equities. Silver gained 1.5%, supported by its industrial exposure. This was not a flight from commodities. It was a rotation away from war insurance and towards areas with more cyclical support.

Currency markets were quieter. Rate expectations, oil and geopolitics all mattered, but none produced a clean foreign-exchange story. The dollar did not dominate the month in the way oil and equities did. The main signal from May came from the asset classes directly tied to the Iran risk premium and the technology rally.

Crypto was the awkward outlier. Bitcoin fell 4.2% while equity markets rallied. That matters. May was not a speculative free-for-all. Investors preferred listed technology, earnings visibility and AI-linked growth to digital assets still searching for a fresh catalyst. Bitcoin behaved less like crisis insurance and less like a straightforward risk-on trade.

The VIX fell 9.3%, which captured the change in mood without proving the risks had disappeared. Washington and Tehran had not reached a durable settlement. Hormuz remained strategically vital. Oil could reprice quickly if diplomacy failed. The market did not solve those problems. It marked down the probability that they would define the immediate future.

May was not a clean risk rally. It was a bet that the worst geopolitical outcomes could be avoided long enough for investors to focus again on earnings, technology and lower energy prices. That bet worked for one month. It may keep working if diplomacy holds. But the foundation is still fragile. The same oil market that released pressure in May could put it straight back if the Iran story turns again.