The S&P 500 has become a pure geopolitical barometer as the Iran war collides with a sharp spike in oil prices, putting the index’s 2026 rally under serious pressure. Futures tied to the S&P 500 fell about 2% in early Tuesday trading as fresh US-Israeli strikes and Iranian retaliation pushed worries about a prolonged conflict and supply disruption through the Strait of Hormuz to the forefront.
This comes after the S&P 500 already dropped 0.5% to 6,860.71 on Monday when Brent crude surged more than 6% to 76.76 USD a barrel and the VIX volatility index hit its highest level of the year.
Oil at $80, Hormuz at Risk
Oil now sits at the center of the S&P 500 story. Brent has climbed roughly 7-9% in two sessions, briefly topping 83 USD as tankers reroute around the Strait of Hormuz and shippers face soaring insurance costs. West Texas Intermediate isn’t far behind, trading in the low‑70s as traders price in the risk that 20% of global crude flows could be choked off if Hormuz remains effectively shut.
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