May continued the turbulent trajectory set in April, with the Iranian conflict and its ripple effects dictating global market sentiment. The optimism that drove the “TACO trade” in April faced a stark reality check as the fragile ceasefire effectively dissolved, leaving the Strait of Hormuz precarious. Oil prices and equities remain highly reactive, and the medium-term economic prognosis firmly points to the unwelcome return of inflation.

Central banks are now confronting a profoundly complex environment. The debate has definitively shifted from when rates will be cut to how high they might have to rise to combat supply-driven inflation. With US CPI reaching 3.8% and the Bank of England modelling scenarios where UK inflation could peak at 6.2% in 2027, the prospect of prolonged tight monetary policy is becoming the consensus view. Fertiliser prices remain heavily elevated, indicating that food price inflation will inevitably follow the current energy shock.

For long-term investors, the discipline of tuning out the daily noise and holding a strategic course remains essential. The range of macroeconomic outcomes is widening, but this volatility will present tactical opportunities for those positioned to look past the immediate geopolitical friction.

United States

May was a defining month for US monetary policy and international trade. On 22nd May, Kevin Warsh was sworn in at the White House as the 17th Chair of the Federal Reserve, succeeding Jerome Powell. Warsh inherits an unenviable triad of challenges: a divided Federal Open Market Committee (evidenced by four dissents at Powell’s final April meeting), surging inflation with April CPI hitting 3.8% and PPI jumping to 6.0%, and immense political pressure from a President demanding lower interest rates. Adding to the institutional friction, Powell broke with 80 years of tradition by remaining on the Fed’s Board of Governors, providing a credible focal point for officials sceptical of Warsh’s agenda.

On the geopolitical front, the much-anticipated Trump-Xi summit finally took place in Beijing in mid-May. The outcome delivered modest stability rather than a grand structural bargain. China committed to purchasing 200 Boeing aircraft and at least $17bn annually in US agricultural products. Crucially for markets, both leaders called for the reopening of the Strait of Hormuz and agreed Iran cannot possess a nuclear weapon. However, tangible enforcement mechanisms were notably absent, and Iran has already begun establishing a new toll system for transiting ships.

US petrol prices remain a point of consumer friction, while the logistics sector continues to absorb heavy fuel surcharges. With the ongoing Middle Eastern supply disruption, the Fed faces a brutal dilemma: raising rates risks exacerbating a war-induced economic slowdown, while cutting them to satisfy political demands could unanchor inflation expectations entirely.

UK

For the UK, May was defined by a political earthquake that will inevitably bleed into fiscal and economic policy. The early May local council elections delivered a sweeping realignment. Labour suffered devastating losses, shedding over 1,100 councillors and losing control of 28 councils. In a dramatic insurgency, Reform UK won over 1,250 seats and took control of 10 councils.

The Green Party also capitalised, securing its first directly elected mayors in Hackney and Lewisham, alongside taking control of Norwich City Council. This volatile political landscape severely limits the Prime Minister’s room for manoeuvre ahead of a general election and raises the premium on domestic fiscal stability.

Economically, the picture remains fragile. The 10-year gilt yield is holding above 5%, reflecting embedded inflation expectations and investor unease regarding the government’s borrowing trajectory. For the British public, this translates directly into sustained pressure on mortgage rates, as swap rates price in a “higher for longer” environment.

The Bank of England’s next Monetary Policy Committee decision on 18th June looms large. Following the 8-1 vote to hold rates at 3.75% in April-where Chief Economist Huw Pill notably dissented in favour of a hike-the committee is edging closer to raising rates to contain the energy-driven inflation shock. The government, constrained by minimal fiscal headroom, continues to resist calls for a 2022-style emergency energy support package, though political pressure to intervene is mounting rapidly.

Europe

European markets remained highly sensitive to the durability of energy supplies. While the ECB held its deposit facility rate at 2.0% at the end of April, President Christine Lagarde confirmed that a rate hike was actively debated. With Eurozone flash CPI at 3.0%-driven entirely by energy-markets are now fully pricing in three ECB rate hikes in 2026, potentially beginning as early as June.

European natural gas prices (Dutch TTF) remain significantly elevated. The continent has entered the crucial summer storage refill season from a depleted position, compounded by the structural deficit created by the damage to Qatar’s Ras Laffan LNG complex.

In Germany, inflation accelerated to 2.8%, complicating the near-term benefits of its recent fiscal expansion. Across the bloc, elevated fertiliser prices continue to cast a shadow over agricultural costs and crop yields heading into 2027, ensuring that food inflation will compound the existing energy squeeze.

Far East

The Trump-Xi summit provided a sigh of relief for Southeast Asian nations, who feared being sidelined by an exclusive US-China trade deal. However, the lack of a definitive resolution to the Strait of Hormuz crisis leaves regional supply chains heavily exposed.

China continues to rely on its strategic reserves to buffer the energy shock, though reports indicate Beijing is now paying Iran fees for “environmental upkeep” to allow its stranded supertankers through the Strait. This pragmatic circumvention highlights the ongoing vulnerability of global shipping routes.

In a bright spot for the region, South Korea’s tech-heavy KOSPI index broke the 7,000 barrier for the first time on 6th May, driven by a Samsung-led AI rally. Nevertheless, both Japan and South Korea remain acutely exposed to sustained crude oil price increases, which threaten to import persistent inflation into economies that traditionally run on low inflation.

Emerging Markets

The stark divergence across emerging markets widened further in May. 

Commodity-exporting nations in Latin America and Africa continue to reap the fiscal benefits of elevated energy and metals prices.

Conversely, energy-importing nations across South and Southeast Asia-such as Bangladesh, Pakistan, and Sri Lanka-are facing severe stress. Lacking the foreign exchange reserves to compete in volatile global energy markets, these governments are forced into damaging trade-offs between maintaining energy access, controlling domestic inflation, and avoiding sovereign default.

Summary

May 2026 underscored the limits of market optimism when confronted with intractable geopolitical and macroeconomic realities. While the US-China summit removed some tail-risk on trade, the Iranian conflict continues to exact a heavy toll on global supply chains and inflation metrics.

The ascension of Kevin Warsh at the Federal Reserve introduces a volatile new variable into global monetary policy, while the seismic results of the UK local elections have fundamentally altered the domestic political calculus. The most immediate concern for investors and consumers alike is the trajectory of interest rates, with central banks now actively contemplating hikes in the face of stubborn, supply-driven inflation.

The core principle for navigating this environment remains unchanged: maintaining perspective and a focus on long-term strategy is paramount. Dislocation creates opportunity. The focus now must be on identifying the sectors and assets that can pass on these inflationary costs, rather than attempting to trade the daily geopolitical headlines.