S&P 500 Slides Into Fifth Weekly Loss as Iran's Hormuz Blockade Sends Brent Past $110

The Iran Oil Shock

The U.S. and Israel launched strikes on Iran on February 28, and the market has been repricing ever since. Iran responded by blocking the Strait of Hormuz — the chokepoint for roughly 21% of global oil supply — and that blockade has only tightened. Maritime intelligence firm Windward tracked just 4 vessel transits on Tuesday, down from an average of 120 daily transits before the war.

The supply shock is severe. Brent crude has risen roughly 45% from pre-war levels near $70 to $107.81 per barrel as of Friday morning, with intraday prints above $111. The disruption doesn't just hit Iranian exports — it restricts flow from Iraq, Kuwait, Saudi Arabia, Qatar, Bahrain, and the UAE. Multiple countries have already implemented fuel rationing. The United States Oil Fund is up 48% over the past month.

Macquarie strategists warn that oil could reach $200 per barrel if the war continues through June. That's the tail risk equity markets are starting to price.

Friday's Escalation

Friday's specific catalyst was the turning away of two Chinese ships from the Strait of Hormuz, confirming that Iran is enforcing its blockade against non-allied commercial traffic. Reports indicate Iran is charging a toll in yuan for any oil that does pass through — a de facto nationalization of the waterway.

President Trump extended his deadline for Iran to reopen the Strait to April 6, claiming negotiations are "going very well." Iran's Foreign Minister Abbas Araghchi flatly contradicted him, stating Tehran is "not engaged in direct talks with Washington and has no intention of negotiating for now." White House Press Secretary Karoline Leavitt warned Iran would face consequences if it rejected military defeat.

The gap between Washington's optimism and Tehran's defiance is exactly what markets hate. Every failed de-escalation attempt has followed the same pattern: brief hope, followed by a harder selloff when reality reasserts.

Fifth Straight Week Down

The S&P 500 fell to 6,380 on Friday, marking its fifth consecutive weekly decline — the longest losing streak since 2022. The index is down roughly 7% for March alone and sits 8% below its all-time high. The Nasdaq has entered correction territory, falling more than 10% from its October peak.

The pain is concentrated in tech. Every Magnificent Seven stock is down at least 3%, with Meta off 4.4% and Amazon down 3.5% on Friday. Energy and utility names are the only sectors in the green — the classic stagflation rotation.

The bond market is flashing the same signal. The 10-year Treasury yield has climbed to 4.44% from 3.97% before the war began, as rising energy costs rekindle inflation fears and push the Fed further from any rate cut. The University of Michigan's consumer sentiment index hit its lowest reading since December 2025, with the sharpest declines among middle- and high-income households. The market is trading like a sustained oil shock is the base case, not a tail risk.

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