Oil jumps to $100 per barrel and stocks sink worldwide with no clear end in sight for the Iran war

The global financial landscape fractured on Thursday as the ongoing conflict with Iran propelled oil prices back above the $100-per-barrel threshold, sparking a widespread retreat from riskier assets. The S&P 500 dropped 1.5% to 6,672.62, ending a brief period of market stability and returning to the volatile swings that have characterized the last several weeks. The Dow Jones Industrial Average saw a significant decline of 739 points, or 1.6%, while the tech-heavy Nasdaq composite fell 1.8% as investors reassessed the impact of a prolonged energy crisis.

At the heart of the market’s anxiety is the Strait of Hormuz, a narrow waterway that serves as the transit point for roughly 20% of the world’s oil supply. In his first public address since taking power, Iran’s new supreme leader warned that his military would continue targeting Gulf Arab neighbors and maintain a functional blockade of the Strait to use as geopolitical leverage against the United States and Israel. This development has forced regional producers to slash output because their crude effectively has nowhere to go, leading Brent crude to jump 9.2% to settle at $100.46.

While the International Energy Agency attempted to calm nerves by announcing a record release of 400 million barrels from global emergency stockpiles, the gesture was largely viewed by Wall Street as a temporary fix. Analysts have cautioned that a sustained closure of the Strait could see prices accelerate toward $150 per barrel, a level that would likely trigger a severe global recession. This spike is particularly poorly timed, as it coincides with a period of economic fragility following a weak U.S. hiring report last month.

The prospect of "stagflation"—a rare and damaging economic condition where growth stalls while inflation remains high—is now a primary concern for the Federal Reserve. Higher energy costs act as a tax on both consumers and businesses, yet the Fed finds itself with few effective tools to combat rising prices when the underlying cause is a geopolitical supply shock rather than excessive demand. Consequently, traders have begun to dial back expectations for when the central bank might resume cutting interest rates.

The impact was felt acutely across sectors with high overhead costs. Cruise-ship operator Carnival fell nearly 8%, and United Airlines dropped 4.6% as investors braced for surging fuel bills. Even the retail sector showed signs of strain; Dollar General saw its stock slide 6.1% after providing a cautious revenue forecast, suggesting that its low-income customer base is running out of the financial "cushion" necessary to absorb higher costs at the pump.

Pressure is also mounting in the private-credit market, where investors are increasingly wary of lending to businesses already struggling with competition from AI-integrated rivals. Morgan Stanley fell 4.1% after one of its private income funds limited investor withdrawals to 5% of total shares, despite receiving requests for more than double that amount. This move highlighted growing liquidity concerns as the cost of borrowing continues to climb, with the 10-year Treasury yield rising to 4.26%.

Despite the double-digit percentage jumps in crude prices this week, some historical perspective remains. The S&P 500 is currently 4.4% below the all-time high it reached in January, reflecting a long-standing trend of markets eventually recovering from Middle Eastern conflicts. However, that resilience is predicated on oil prices not remaining at these elevated levels for a long duration, a scenario that looks increasingly unlikely as the standoff in the Persian Gulf shows no sign of a diplomatic resolution.