Global financial markets absorbed a severe shock on February 28, 2026, when the United States and Israel launched coordinated military strikes against Iran, targeting key leadership and military infrastructure. The operation resulted in the death of Supreme Leader Ayatollah Ali Khamenei and triggered immediate Iranian retaliation across U.S. and Israeli bases throughout the Middle East. By March 1, the Strait of Hormuz—a critical chokepoint handling 20 percent of global oil trade—came to a standstill as tanker traffic halted.

Investors reacted swiftly. Global equities dropped, oil prices surged, and safe-haven assets rallied. The MSCI global equities index fell 1.5 percent on March 4, while U.S. crude settled at 90.03 dollars per barrel and Brent reached 93.10 dollars. The conflict introduced a dual threat: supply disruption risk and renewed inflation pressure at a moment when markets were already fragile following February’s sharp tech selloff.

The financial implications extend beyond immediate price movements. With the Strait responsible for 20 percent of global liquefied natural gas flows and 5 million barrels per day of refined products, any prolonged closure threatens to reshape energy markets and complicate central bank policy across major economies.

Oil Markets Confront Supply Uncertainty and Spare Capacity Questions

The Strait of Hormuz shutdown represents the most significant supply risk since the conflict began. Iran produces approximately 3.3 million barrels per day of crude oil and exports around 1.6 million barrels per day, primarily to China. A sustained closure would damage Iran’s own economic interests, yet the immediate market impact remains severe.

Devin McDermott, Morgan Stanley’s Head of North American Energy Research, stated that any disruption to transport through the Strait can have substantial impacts to global energy markets and prices. Historical precedent offers limited reassurance. While the Strait has experienced temporary disruptions during regional conflicts, it has never closed entirely.

OPEC+ responded on March 2 by announcing a supply increase of 206,000 barrels per day. Morgan Stanley Oil Strategist Martijn Rats noted that markets are likely to focus less on the quota adjustment and more on the deliverable incremental barrels from core producers like Saudi Arabia and the United Arab Emirates.

The quota change on paper will not stabilize markets, according to Rats. The critical question is how much sustained, deliverable spare capacity exists and how quickly additional barrels can be moved into the export system.

Before the strikes, market fundamentals appeared comfortable. The latest U.S. Weekly Petroleum Status Report showed a 16 million barrel increase in crude inventories, signaling no immediate supply tightening. Geopolitics aside, the physical market appeared well supplied, Rats confirmed.

Capital Economics Chief Emerging Markets Economist William Jackson projected that even if the conflict remained contained, Brent might rise to approximately 80 dollars per barrel—matching the peak during the 12-day war in Iran last June. A prolonged conflict affecting supply could push oil prices to around 100 dollars, potentially adding 0.6 to 0.7 percentage points to global inflation.

Equity Markets Show Historical Resilience Despite Elevated Valuations

The energy sector entered the crisis as the strongest performer in the S&P 500 year to date, up 25 percent through February, supported by firming oil prices and attractive valuations. The sector trades at a 42 percent discount to the broader index.

McDermott noted that shares of upstream producers, integrated oil companies, and refiners could benefit if oil prices continue to rise, though gains may be offset by higher freight costs. His recommendation: remain defensive with a quality bias during this period of heightened volatility.

Historical data provides some comfort. From the Korean War in the 1950s to Russia’s invasion of Ukraine in 2022, the S&P 500 delivered average gains of 2 percent, 6 percent, and 8 percent over one, six, and 12-month periods following geopolitical shocks, based on Morgan Stanley and Bloomberg data.

Mike Wilson, Morgan Stanley Chief Investment Officer and Chief U.S. Equity Strategist, highlighted that the probability of a bear case scenario for equities would materially increase only if oil prices spiked 75 percent to 100 percent year-over-year in a late-cycle backdrop. Wilson’s view of today’s early-cycle environment—with earnings accelerating—provides an important buffer.

Unless oil prices spike in a historically significant manner and remain elevated, recent events are unlikely to change our bullish view on U.S. equities over the next six to 12 months, Wilson stated.

However, valuation metrics signal caution. The CAPE ratio for the S&P 500 eased slightly to 39.55 times the last 10 years of inflation-adjusted earnings as of early March. Despite this correction, these readings remain among the highest ever recorded and suggest investors are paying a premium for each dollar of earnings.

Wall Street futures reflected immediate stress on March 3. Dow Jones Industrial Average futures fell 375 points, while S&P 500 and Nasdaq futures also declined. This classic risk-off adjustment showed investors becoming less willing to hold equities when uncertainty makes forecasting earnings difficult, similar to how stocks tumble amid geopolitical tensions and inflation fears.

Currency and Safe-Haven Assets Reflect Flight to Quality

Currency markets responded predictably to the escalation. The dollar index fell approximately 1 percent during the conflict’s first days, though analysts at Commonwealth Bank of Australia noted such declines typically reverse within three to four days.

If the conflict proves long-lasting and disrupts oil supplies, the U.S. dollar would likely lift against most currencies except the Japanese yen and Swiss franc, CBA analysts projected. The U.S. benefits as a net energy exporter from higher oil and gas prices resulting from disrupted supply.

The Swiss franc faced further upward pressure, rising 3 percent against the dollar through March, creating challenges for the Swiss National Bank. The franc’s safe-haven status intensified as investors sought protection.

Gold continued its record run, up 22 percent through early March 2026, as investors made another dash for the precious metal. Silver also rallied alongside gold’s surge.

U.S. Treasury demand increased as yields fell in late February and early March, reflecting a flight to safety. Bitcoin proved the outlier, falling 2 percent on February 28 and shedding more than a quarter of its value over two months, no longer behaving as a safe-haven asset.

Israel’s shekel faced particular pressure. The currency dropped 5 percent at the start of the June 2025 war and reacted similarly after Israel struck Iran’s Damascus consulate in April 2024. JPMorgan warned this episode could prove different if the conflict and market risk premia proved more persistent, especially if confrontation with Iran triggered more intensive operations against Iran’s proxies.

Regional Markets and Sector-Specific Impacts Emerge

Middle East bourses opened March 2 under pressure. Ryan Lemand, CEO and co-founder of Neovision Wealth Management, projected Gulf equities could drop 3 to 5 percent depending on the conflict’s scale. Saudi Arabia’s benchmark stock index dropped 1.3 percent in five days through February 27, its second consecutive week of declines.

Dubai’s main market, which reopened March 3, faced similar headwinds following two weeks of losses. These markets remain highly correlated to oil prices, and an escalating conflict ripples through the broader economies.

Global airlines cancelled flights across the Middle East on February 28, and airline stocks faced pressure as the conflict threatened to force more airspace closures. Conversely, European weapons makers—already up 10 percent through February—could see increased demand.

The Nasdaq demonstrated particular sensitivity due to its heavy weighting in growth and technology stocks. Growth valuations depend heavily on future earnings expectations and low discount rates. When geopolitical tensions cause oil price spikes and inflation fears emerge, bond yields can rise, decreasing the present value of future earnings and putting direct pressure on technology stocks, as seen when markets face volatility and investors shift allocations.

Federal Reserve Policy Caught Between Inflation and Growth

The conflict’s timing complicates Federal Reserve decision-making. U.S. inflation data released March 4 remained elevated and aligned with projections. Rising oil prices threatened to intensify inflation pressure just as markets had begun pricing in potential rate cuts later in 2026.

Higher oil prices feed directly into inflation expectations. If inflation fears return, expectations for rate cuts weaken. This creates a negative loop for equities: higher rates squeeze valuations and slow demand, pressuring corporate earnings, which raises concerns about whether the AI boom could lead to lower interest rates as previously anticipated.

President Donald Trump threatened severe action against Iran unless a peace deal materialized, further exacerbating market concerns. Iran’s president suggested such threats signaled U.S. desperation, offering little hope for near-term diplomatic resolution.

The energy sector’s 25 percent gain through February positions it well if oil prices remain elevated, yet the broader market remains vulnerable. The S&P 500, Dow Jones, and Nasdaq all maintain longer-term bullish technical structures, but near-term corrections cannot be ignored. A break below 24,000 for the Nasdaq, 48,000 for the Dow Jones, and 6,500 for the S&P 500 would signal significant downside risk.

Frequently Asked Questions

How much oil flows through the Strait of Hormuz daily?

The Strait of Hormuz handles approximately 20 percent of global oil trade, 20 percent of the world’s liquefied natural gas, and 5 million barrels per day of refined products. Alternative routes exist but can accommodate only a fraction of these volumes, making the Strait a critical chokepoint for global energy markets.

What oil price level would significantly impact global inflation?

Capital Economics projects that a prolonged conflict pushing Brent crude to around 100 dollars per barrel could add 0.6 to 0.7 percentage points to global inflation. Morgan Stanley notes that a 75 to 100 percent year-over-year oil price spike in a late-cycle environment would materially increase the probability of a bear market for equities.

How have equity markets historically performed after geopolitical shocks?

Historical data shows that from the Korean War to Russia’s 2022 invasion of Ukraine, the S&P 500 delivered average gains of 2 percent, 6 percent, and 8 percent over one, six, and 12-month periods following geopolitical events. However, Morgan Stanley emphasizes this pattern holds unless oil prices spike in a historically significant manner and remain elevated.

Conclusion

The U.S.-Iran conflict presents financial markets with a complex risk matrix. Oil supply concerns dominate near-term price action, while inflation implications threaten to derail central bank easing plans. Equity valuations entered the crisis at elevated levels, leaving little margin for negative surprises.

The direction of global markets through the remainder of 2026 depends largely on whether tensions escalate further or move toward diplomatic resolution. Evidence of de-escalation could trigger a rapid recovery in risk assets, as previous Middle East conflicts demonstrated. Prolonged disruption, particularly at the Strait of Hormuz, would force a fundamental reassessment of energy markets, inflation trajectories, and monetary policy paths across major economies.