S&P 500 down 1.5%, Dow Jones slip 400 points as Iran conflict lifts oil

• Tech stocks led losses with Nvidia, Microsoft, Alphabet, Tesla, and Meta all declining; Russell 2000 slipped into correction territory (down 10% from recent high)
• Oil prices surged as Iraq declared force majeure on foreign-operated oilfields amid the four-week US-Israel-Iran conflict, with reports of additional US Marine deployments and ongoing strikes on energy infrastructure
• US Treasury yields rose for a third straight session, with rate futures now indicating the Fed is more likely to raise rates than cut them by end of 2026, complicating the monetary policy outlook

Market Summary: US Stocks Decline on Iran Conflict and Oil Surge

Key Market Movements:

US equities closed sharply lower on Friday, March 20, 2026, with the S&P 500 falling 1.51% to 6,506.48, the Dow Jones dropping 0.96% (443 points) to 45,577.47, and the Nasdaq Composite leading losses with a 2% decline to 21,647.61. All three major indices posted their fourth consecutive weekly decline and traded below their 200-day moving averages, indicating deteriorating market momentum.

Primary Drivers:

The selloff was triggered by escalating US-Israel conflict with Iran entering its fourth week, with increased military deployments including additional US Marines and Iranian strikes on energy infrastructure. Oil prices surged dramatically, with Brent crude climbing above $111 per barrel and West Texas Intermediate exceeding $97, partly due to Iraq declaring force majeure on foreign-operated oilfields.

Sector Impact:

Technology stocks led losses, with major names including Nvidia, Microsoft, Alphabet, Tesla, and Meta Platforms all declining. Even defensive sectors like utilities suffered as rising bond yields reduced their appeal. The small-cap Russell 2000 entered correction territory (down 10% from recent highs), while the Dow and Nasdaq approached similar thresholds.

Market Implications:

Rising energy costs have intensified inflation concerns, complicating Federal Reserve policy outlook. US Treasury yields climbed for a third consecutive session, with rate futures now suggesting the Fed is more likely to raise rates than cut them by year-end 2026, according to CME's FedWatch tool. Friday's "triple witching" event amplified volatility.

Analysts warn additional downside may lie ahead, as equity markets haven't fully priced in the geopolitical risks and sustained elevated oil and gas prices expected in coming weeks.