S&P 500, Nasdaq Slide as Iran Conflict Keeps Oil Prices Elevated

• The United States Oil Fund jumped nearly 4% on Friday and has surged 48% over the past month as the Strait of Hormuz conflict limits access to oil from Iran, Iraq, Kuwait, Saudi Arabia, Qatar, Bahrain, and the UAE.
• Magnificent 7 tech stocks all declined, with Meta Platforms falling 4.4% and Amazon down 3.2%, significantly impacting cap-weighted indexes due to their trillion-dollar market capitalizations.
• All three major indexes are down approximately 7% for March, with the Nasdaq falling 2.2% and S&P 500 down 1.1% over the past week as markets price in prolonged uncertainty and potential supply chain disruptions.

Market Summary: U.S. Equities Decline on Iran Conflict and Oil Price Surge

Market Performance:

U.S. equity markets experienced significant losses on March 27, 2026, driven by escalating Iran tensions and soaring oil prices. By midday ET, the S&P 500 fell 1.27% to 6,393.02, the Dow Jones Industrial Average declined 1.26% to 45,410.54, and the Nasdaq Composite dropped 1.84% to 21,015.15. For the month of March, all three indices were down approximately 7%.

Key Drivers:

The primary catalyst was the Iran conflict restricting access through the Strait of Hormuz, limiting oil shipments from major producers including Iraq, Kuwait, Saudi Arabia, Qatar, Bahrain, and the UAE. The United States Oil Fund (USO) surged nearly 4% on Friday and has climbed a staggering 48% over the past month. This spike in energy costs is expected to translate into broader consumer price increases.

Sector Performance:

Technology stocks bore the brunt of the sell-off, with the Magnificent 7 particularly hard hit. Meta Platforms declined 4.36%, Amazon fell 3.23%, while Microsoft, Nvidia, and Tesla also posted losses. Bitcoin dropped 4.8% to $65,818. Conversely, energy and utility stocks bucked the downward trend, rising alongside basic materials and consumer defensive sectors.

Market Implications:

The market is pricing in prolonged uncertainty regarding Middle Eastern tensions and global supply chain disruptions. The conflict's impact extends beyond Iran, affecting oil-dependent nations like South Korea, Japan, and China. Analysts suggest volatility may persist until the Strait of Hormuz situation resolves, though long-term investors are advised to remain patient and diversified through this turbulence.