Iran war shakes global bond market: yields surge and institutional investment strategy adjustments

Introduction

The Iran war continues to escalate, and geopolitical risks are being transmitted to global financial markets through oil prices. On July 23, 2026, the yield on the 10-year US Treasury rose to 4.71%, the highest level since January 2025. The bond market is sending a warning through prices: inflationary pressures are difficult to subside, and interest rates may remain high for a long time. For institutional investors, this signal means that asset allocation logic needs to be reconsidered.

Market Background

Since the outbreak of the Iran war at the end of February 2026, Brent crude oil prices have broken through $100 per barrel, with a single-day increase of 7% on July 23. Soaring energy costs have directly pushed up inflation expectations, forcing the Federal Reserve to reconsider its policy path. According to CME FedWatch data, the market is pricing in a 36% probability of a 25-basis-point rate hike at next week's FOMC meeting.

Meanwhile, the Federal Reserve has entered a new cycle. Kevin Warsh succeeded Jerome Powell as Fed Chairman in May 2026 and quickly established a task force to review the communication framework, inflation target, and balance sheet policies. The market remains vigilant about Warsh's hawkish tendencies, further pushing up long-term interest rate expectations.

The issue of the US fiscal deficit cannot be ignored. Secretary of Defense Pete Hegseth stated that the war has cost $37.5 billion, and the deficit is expected to widen further, increasing the supply pressure on Treasury bonds. The yield on the 30-year US Treasury hit its highest level since 2007 in May 2026.

Current Capital Flows

Rising bond yields are diverting global capital. In the fixed income market, investors demand higher term premiums to compensate for inflation and fiscal risks, leading to a widening spread between short-term and long-term yields. Tech stocks are bearing the brunt: Alphabet fell nearly 7% due to rising AI capital expenditure expectations, Tesla plunged 14.5% after disappointing earnings, and the Nasdaq index has corrected more than 7% from its June high.

Funds are shifting from growth stocks to value stocks and energy sectors, but overall risk appetite is declining. As bonds become more attractive (despite falling absolute prices), some institutions are beginning to reduce equity exposure and increase allocations to short-term Treasury bonds or Treasury Inflation-Protected Securities (TIPS). JPMorgan CEO Jamie Dimon publicly stated that he would not buy long-term Treasury bonds at current prices, reflecting the market's cautious attitude toward long-term bonds.

Investment Logic Analysis

Factors driving changes in capital flows include:1. Geopolitical Dominance over Inflation Expectations: The Iran war directly pushes up inflation through energy prices, and the risk of conflict escalation makes the inflation outlook even more uncertain. 2. Fed Policy Uncertainty: The stance of newly appointed Chair Warsh is not yet fully clear, but the market tends to anticipate a more aggressive rate path. 3. Fiscal Sustainability Concerns: War spending combined with long-term structural deficits increases bond supply, pushing yields higher. 4. Economic Resilience Test: If interest rates rise further, the risk of a recession will increase, and institutions need to balance growth and inflation risks.

These factors are not short-term shocks. Structural trends such as deglobalization, the cost of the energy transition, and tight labor markets may keep the inflation pivot higher than pre-pandemic levels for a prolonged period, thereby changing the low-interest-rate, low-inflation paradigm of the past decade.

Risk Factors

• Geopolitical Escalation: If tensions in the Strait of Hormuz and the Red Sea worsen further, oil prices could break $120, triggering global stagflation risks.
• Fed Over-Tightening: If rate hikes exceed market expectations, it could trigger a sharp adjustment in asset prices and an economic recession.
• Out-of-Control Fiscal Deficit: If the U.S. government bond rating is downgraded, it would trigger a broader bond sell-off.
• Market Liquidity Crisis: When bond market volatility intensifies, leveraged investors may be forced to liquidate positions, amplifying systemic risks.

Long-Term Outlook

Looking ahead 3 to 10 years, the logic of global asset allocation is undergoing a fundamental shift. Institutional investors need to focus on the following points:

• Rising Risk Premium on Long-Duration Bonds: As structural problems intensify, the pivot of government bond yields may persistently stay above pre-pandemic levels, making bonds no longer a risk-free asset.
• Increased Demand for Inflation Protection Assets: Real assets such as TIPS, commodities, infrastructure, and real estate will occupy a larger share in portfolios.
• Greater Weight for Geopolitical Factors: Investment decisions need to more systematically incorporate geopolitical risk factors.
• Prominence of Alternative Investments: Private equity, private credit, and real assets, which offer inflation pass-through mechanisms and income sources, are being increasingly allocated by pension funds and sovereign wealth funds.

Over the long term, the global investment landscape is shifting from a "low-rate unipolar era" to a "high-volatility multipolar period." Institutions need a more dynamic asset allocation framework to cope with sustained shocks from interest rates, inflation, and geopolitics.