US Markets Stall as Geopolitical Tensions Over Iran Resurface, Oil and Defense Stocks React

The S&P 500 and Nasdaq Composite reversed early gains on March 10, 2026, as concerns over a potential escalation in Iran-related conflicts dampened market sentiment. The rally, which had seen the S&P 500 rise 1.2% in the prior session, stalled amid fresh intelligence indicating increased Iranian missile readiness and intensified naval activity in the Strait of Hormuz. The shift in tone was reflected in key market indicators, including a 14% spike in the CBOE Volatility Index (^VIX) to 22.8, signaling heightened investor anxiety. Crude oil prices responded sharply, with West Texas Intermediate (CL=F) futures climbing to $89.40 per barrel—a 4.1% increase—marking the highest level since January. The move followed reports of disrupted shipping lanes and the deployment of additional US naval assets to the region. Energy stocks, led by ExxonMobil and Chevron, saw gains of 3.5% and 3.1% respectively, while integrated oil majors like ConocoPhillips rose 2.8%. In contrast, defensive sectors and defense contractors outperformed. Northrop Grumman (NOC) jumped 5.7%, Lockheed Martin (LMT) rose 4.9%, and Raytheon Technologies (RTX) gained 4.3%. Apple (AAPL) dipped 1.6%, pressured by broader tech sector weakness and concerns over supply chain disruptions in the Middle East, though its long-term outlook remained intact. The S&P 500 closed flat at 5,342.17, while the Nasdaq lost 0.4%. Market participants now anticipate a sustained focus on geopolitical risk, with analysts warning of continued volatility if diplomatic progress stalls. The shift underscores a pivot from growth optimism to risk mitigation, particularly in sectors sensitive to global stability.