Oil prices rose and US stocks slipped on Monday as tensions between the United States and Iran flared again over tanker movements in the Strait of Hormuz.
The S&P 500 fell 0.2% from its all-time high, marking just its second decline in 14 days after the US seized an Iranian-flagged cargo vessel it said tried to evade its blockade of Iranian ports. The Dow Jones Industrial Average dipped 4 points, or less than 0.1%, and the Nasdaq composite fell 0.3%. Brent crude oil climbed 5.6% to settle at $95.48 a barrel, reversing a prior day’s drop when Iran had reopened the strait to commercial traffic.
Why oil prices moved despite limited market reaction
Oil’s rise reflected worries that Iran could restrict petroleum flows if it continues blocking tankers from exiting the Strait of Hormuz, a critical chokepoint for global energy supplies. Prices remain well below the $119 peak reached earlier in the war, suggesting investors still see a chance for a US-Iran agreement that could restore normal shipping. The next major deadline is Tuesday night at 8 p.m. Eastern time, when a ceasefire agreement is set to expire.
For more on this story, see Oil Prices Rise Amid US-Iran Ceasefire Talks and Hormuz Tensions.
How specific sectors and stocks reacted to the shift
Airlines and cruise lines with high fuel costs fell sharply, with Norwegian Cruise Line Holdings dropping 3.5% and Royal Caribbean Group losing 1.1%. United Airlines sank 2.8% and American Airlines fell 4.2% after the latter said it was not interested in a merger with United. In contrast, TopBuild jumped 19.4% on news that QXO is acquiring it in a $17 billion deal, which would make QXO the continent’s second-largest publicly traded building products distributor; QXO’s own stock fell 3.1% on the announcement.
This follows our earlier report, Oil Prices Rise Amidst Iran Conflict & Hormuz Strait Concerns – March 2026.
What caused the S&P 500 to slip from its record high?
The S&P 500 declined after the US seized an Iranian-flagged vessel it said tried to evade its blockade of Iranian ports, reigniting tensions that had briefly eased when Iran reopened the Strait of Hormuz to commercial traffic.
Why did airline stocks fall despite the modest oil price increase?
Airlines with large fuel bills, such as United and American, saw their stocks drop because even moderate rises in crude oil costs increase operating expenses, which directly affect profitability in the sector.
