Inflation Pressures Intensify as Iran Conflict Remains Unresolved

May 18, 2026

Executive Summary

Markets continue to navigate an increasingly complex environment shaped by rising inflation pressures, elevated energy prices, and growing geopolitical uncertainty. Treasury yields have moved sharply higher as investors reassess the outlook for inflation and monetary policy, while the ongoing conflict in Iran continues to pressure global energy markets and complicate the broader economic outlook. Although economic growth and corporate earnings remain resilient, the margin for error is narrowing as markets become more dependent on a small group of large-cap technology leaders and policy flexibility becomes increasingly constrained.

Key Takeaways:

• The S&P 500 posted a seventh consecutive weekly gain despite a sharp Friday selloff and continued weakness beneath the surface.
• Oil prices remained above $100 per barrel as the Iran conflict and closure of the Strait of Hormuz continued to pressure global energy markets.
• Inflation data surprised to the upside, with both CPI and PPI signaling renewed price pressures tied to energy and upstream production costs.
• Treasury yields climbed to roughly one-year highs as markets increasingly price a “higher-for-longer” interest-rate environment.
• Limited progress emerged from the Trump-Xi summit.
• Kevin Warsh prepares to assume leadership of the Federal Reserve amid rising inflation and growing policy uncertainty.

Financial Markets

U.S. equity markets ended the week mixed, with stocks selling off sharply on Friday. Despite the late-week decline, the cap-weighted S&P 500 still managed to post its seventh consecutive weekly gain, underscoring the market’s continued reliance on a relatively narrow group of large-cap technology and AI-related leaders. Notably, the equal-weighted S&P 500 has now fallen behind the cap-weighted index on a year-to-date basis after outperforming for much of the year. The shift in relative performance, which began toward the end of March, further highlights how concentrated recent market gains have become among a small group of mega-cap and AI-linked companies.

Geopolitical developments remain central to market sentiment. News flow surrounding the war in Iran continues to lack clarity, while the ongoing closure of the Strait of Hormuz has kept energy markets under pressure. Oil prices remain above $100 per barrel, reinforcing concerns that elevated energy costs could increasingly feed into broader inflation trends. Markets have so far shown resilience, but each additional week without a clear resolution raises the risk that what initially appeared to be a temporary energy shock becomes more deeply embedded in inflation expectations and financial conditions.

Fixed-income markets reflected these concerns. Treasury yields moved sharply higher, with the 10-year yield climbing toward 4.6% (from 4.4%) and the policy-sensitive 2-year rising to approximately 4.07% (from 3.95%), both reaching their highest levels in roughly a year. The move higher in yields represents a tightening in financial conditions and reflects a meaningful shift in monetary policy expectations, as earlier optimism surrounding eventual Federal Reserve easing has faded and markets increasingly price a “higher-for-longer” interest-rate environment.

Economics

April inflation data reinforced concerns that price pressures are beginning to reaccelerate, particularly through energy and upstream production costs. Core CPI rose 0.4% month-over-month, above expectations, while the year-over-year core rate accelerated to 2.8%. Headline CPI increased 0.6%, lifting the annual rate to 3.8%, the highest since May 2023. Energy prices remained the primary driver, rising 3.8% during the month and accounting for roughly 40% of the increase in headline inflation amid continued disruptions tied to the Iran conflict. Food prices also rose sharply as higher fuel and fertilizer costs filtered through supply chains. Beneath the surface, however, some components remained more constructive. Core goods inflation stayed relatively subdued, suggesting most tariff-related pass-through effects have already occurred. Producer prices were less encouraging. Core PPI rose 1.0% month-over-month, its strongest increase since March 2022, while headline PPI rose 1.4%, signaling that upstream cost pressures are intensifying and could increasingly flow through to consumers in the months ahead.

Despite rising inflation pressures, consumer activity has remained relatively resilient. April retail sales rose 0.5%, matching expectations. However, much of the strength reflected higher gasoline prices, suggesting underlying discretionary demand may be softer than headline figures imply. Consumers continue to spend on services and travel, supported by a still-stable labor market, though hiring momentum is cooling. Initial jobless claims rose modestly to 211,000 but remain low, reinforcing the ongoing “low-hiring, low-firing” environment. Taken together, the data point to a more complicated macro backdrop: inflation pressures are rising, energy costs remain elevated, and growth is slowing only gradually, reinforcing expectations that interest rates may need to remain higher for longer.

Policy

President Trump concluded his visit to Beijing on Friday following meetings with Chinese President Xi Jinping that produced limited concrete progress. While both leaders emphasized the importance of preventing further escalation in the Middle East and agreed that Iran should not possess a nuclear weapon, no clear framework emerged regarding how the conflict might be resolved or how the Strait of Hormuz could be reopened. Trade discussions also fell short of expectations. President Trump announced that China agreed to increase purchases of U.S. oil, agricultural products, and 200 Boeing aircraft. However, few details were provided, and Chinese officials did not publicly confirm the arrangements. Progress on other key issues, including rare earth exports and semiconductor restrictions, also appeared limited, with little indication that China’s temporary pause on export restrictions would be extended.

Elsewhere, monetary policy developments remained in focus as Kevin Warsh was confirmed to the Federal Reserve Board of Governors and is expected to be sworn in as Chair imminently. Jerome Powell remains acting Chair during the transition. Warsh enters at a difficult moment, with inflation pressures reaccelerating, oil prices elevated, and markets increasingly skeptical that the Fed will be able to ease policy in the near term. At the same time, President Trump continues to advocate for lower interest rates, while divisions within the Federal Open Market Committee persist regarding how policymakers should respond to energy-driven inflation pressures.

Conclusion

The investment environment has become increasingly complex. Bond market stress is rising as Treasury yields move higher, tightening financial conditions both domestically and globally. At the same time, instability in the Middle East remains central to market direction, with elevated energy prices continuing to pressure inflation expectations and complicate the policy outlook.

Importantly, the underlying expansion remains intact. Consumer spending is still positive, labor markets remain relatively stable, and corporate earnings continue to support equity valuations. However, market leadership remains increasingly concentrated among a narrow group of large-cap technology and AI-related companies, leaving equities more vulnerable to volatility should inflation remain elevated or geopolitical conditions deteriorate further. In this environment, maintaining a disciplined, diversified approach grounded in quality and long-term perspective remains essential.

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