Stock Markets May 29, 2026 05:32 AM

Barclays Says US-Iran Deal Progress May Lift Broader Equity Performance

Bank sees easing Middle East tensions, lower oil and softer rates as potential catalysts to extend gains beyond US, AI and chip leaders

By Sofia Navarro LCO

Barclays notes global equities are making fresh highs on reports of progress toward a US-Iran agreement. The bank highlights strong earnings momentum and stabilizing interest rates as core supports, while warning that gains are currently concentrated in US markets and in technology-related sectors. A confirmed deal that reopens the Strait of Hormuz and leads to lower oil and rates could expand the rally to lagging regions and sectors, though Barclays cautions that only a durable settlement would produce sustained broad market gains.

Barclays Says US-Iran Deal Progress May Lift Broader Equity Performance
LCO

Key Points

  • Global equities are at new highs, supported by reports of progress toward a US-Iran agreement, strong earnings momentum and stabilizing interest rates.
  • Recent strength is concentrated in US markets, artificial intelligence and semiconductor sectors, while European indices remain below late-February highs.
  • A confirmed deal that reopens the Strait of Hormuz and leads to declines in oil and rates could broaden market gains and help European equities escape a three-month trading range.

Markets and catalyst

Global equity markets have continued to push to new highs against a backdrop of headlines suggesting progress on a US-Iran agreement, according to Barclays. The bank identifies two principal supports for the advance: resilient earnings momentum and interest rates that appear to be stabilizing. Despite these supports, Barclays notes that the recent strength remains concentrated in US markets and in areas tied to artificial intelligence and semiconductors.

Europe versus the United States

European bourses have staged a rebound on hopes for a de-escalation of geopolitical risk, but Barclays points out that they still trade below their February 27 peaks. Specifically, the STOXX Europe 600 and the EURO STOXX 50 remain beneath those levels, while the S&P 500 has moved about 9% above its late-February high. The bank suggests that a confirmed agreement could help European equities break out of a three-month trading range if it triggers declines in oil prices and interest rates.

Sectors on divergent paths

Barclays highlights a pronounced dispersion across sectors linked to the conflict. Beneficiaries of the elevated risk environment include energy, telecoms, utilities and insurance, which have outperformed. In contrast, sectors such as consumer discretionary, mining and banking have lagged. Barclays expects some reversal of this sectoral pattern if a deal materializes and reduces the conflict-driven premium.

Limits to upside

The bank also warns that a partial or short-lived agreement would likely produce only limited gains in equity markets. Barclays' macro analysts expect oil prices to remain elevated, a dynamic that could sustain inflationary pressures and limit the durability of any rally in the currently lagging sectors.

Historical perspective and market positioning

Barclays observes that prior energy shocks have not left permanent upward pressure on oil; prices have typically fallen sharply once situations stabilized and excess supply returned. Current equity positioning, the bank says, does not appear to price in a high probability of a sharp, sustained decline in oil, though such an outcome would be welcomed by President Trump ahead of midterm elections.

Market snapshot

The bank's commentary sits alongside market moves that included the S&P 500 rising about 0.58% and the STOXX 50 up roughly 0.68% during the same session. Oil benchmarks showed declines, with LCO down about 1.74% and Brent also lower by roughly 1.78% in the intraday moves referenced by Barclays. Short-term US yields moved fractionally lower in the period noted by the bank.


Implications

Barclays frames the situation as one in which a confirmed reopening of the Strait of Hormuz, followed by falls in oil and interest rates, could broaden the equity advance beyond the concentrated gains seen to date. At the same time, the bank stresses that only a durable diplomatic settlement and sustained easing in commodity and rate pressures would likely deliver a substantive rotation into lagging sectors and regions.

Risks

  • An incomplete or temporary agreement could limit stock market gains, curtailing any rotation into lagging sectors such as consumer discretionary, mining and banking.
  • Barclays' macro team expects oil prices to remain elevated, which could sustain inflation risks and reduce the durability of rallies in underperforming sectors.

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