Iran conflict lifts oil, defense stocks as investors weigh inflation

Rising oil prices and shifting investor sentiment have followed renewed U.S. strikes on Iran. Brent crude briefly exceeded $90 a barrel after ten consecutive nights of American attacks and a Houthi maritime embargo on Saudi Arabia. The S&P 500 fell only marginally on the latest session and sits 2 percent below its June peak, reflecting a market that has so far treated the escalation as contained.

The central tension is whether higher energy costs will persist long enough to alter inflation expectations and corporate earnings. Art Hogan of B. Riley Wealth noted that sustained prices above $85 to $90 would force downward revisions to 2026 profit forecasts. The 10-year Treasury yield held above 4.6 percent, adding pressure on borrowing costs. JPMorgan strategist Mislav Matejka advised clients to buy dips, arguing that markets have grown skilled at pricing geopolitical events as temporary.

Economists see clearer downside for households. Mark Zandi of Moody's Analytics calculated that the average U.S. household has already lost roughly $1,100 in higher energy costs and military outlays, pushing real disposable income flat or negative. Gasoline reached $4 a gallon in some regions. Core inflation readings have not yet reflected the energy spike, leaving the Federal Reserve on hold with futures pricing an 83 percent chance of unchanged rates at the next meeting.

Jamie Dimon warned that markets continue to underprice overlapping risks from the Middle East, Ukraine, U.S.-China tensions, and large fiscal deficits. He said he would not buy broad equities or long-dated Treasuries at current levels. Defense contractors and energy producers have outperformed, while fuel-dependent retailers and airlines face margin pressure. Ryanair cited delayed bookings tied to the conflict.

Passage through the Strait of Hormuz remains the clearest escalation threshold. Analysts are monitoring Iranian domestic politics and any increase in U.S. troop deployments. A separate hypothetical discussion of U.K. fiscal policy under a new prime minister has no direct bearing on these market movements.