As the U.S.-Iran war heats up again, these parts of the stock market and economy could be affected

by | Sep 30, 2026 | Stock Market

As the U.S.-Iran war heats up again, these parts of the stock market and economy could be affected

Intensified military operations between the U.S. and Iran over the weekend prompted Wall Street to reassess economic implications of the conflict. The U.S. conducted its tenth consecutive night of strikes against Iran following a Houthis-declared maritime embargo against Saudi Arabia, and a third service member death signaled the conflict could enter a prolonged phase. President Trump pledged retaliation via social media.

The stock market showed relative resilience despite the tensions. The S&P 500 declined only marginally on Monday and remained positioned just 2% below its all-time high established in June. Since reaching a closing low of 6,343.72 in late March, the index had recovered substantially, largely reflecting investor expectations that neither power would seek outright war due to mutual economic risks. Market participants shifted focus to corporate fundamentals, with second-quarter earnings momentum and recent softer-than-expected inflation data bolstering sentiment.

However, analysts flagged emerging concerns about energy cost escalation. Brent crude briefly exceeded $90 per barrel on Monday and held near that level into Tuesday, while the U.S. 10-year Treasury yield traded above 4.6%. Market strategists warned that sustained elevated energy prices could force downward revisions to earnings estimates and potentially trigger market corrections. Tech, representing 38% of S&P 500 weighting, held relative insulation from fuel costs, while energy companies and logistics firms faced headwinds.

Economists expressed broader anxiety about consumer impact. The average American household had lost approximately $1,100 since the conflict began through increased energy costs and military spending, according to analysts at Moody’s Analytics. Personal saving rates declined to 3% in May from nearly 5% annually, suggesting households increasingly depleted reserves to maintain consumption. Gasoline prices reached $4 per gallon on Monday for the first time in more than a month. Fed futures indicated an 83% probability the central bank would hold rates steady at its upcoming meeting despite anticipated upward pressure on consumer inflation readings from energy costs.

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