Oil prices spiked sharply on July 12, 2026. West Texas Intermediate — the main U.S. oil benchmark — climbed 4.26% to $74.45 a barrel. That's a $3.04 jump in a single day, one of the largest moves in six years. Brent crude, the global standard, rose nearly as much.

This matters to ordinary people because oil prices shape what you pay at the pump and affect inflation across the economy. So understanding why prices move is worth the effort.

For context: prices had been falling steadily for weeks before this jump. By early July, Brent had dropped to its lowest level since the Iran war began in February 2026. Markets had been calm. Then, without any announced new supply disruption or military strike, traders suddenly decided oil was worth significantly more.

What changed in traders' minds? The short answer: they're now betting that disruptions in the Strait of Hormuz — a narrow waterway between Iran and Oman through which about one-third of the world's seaborne oil passes — will last longer than they previously thought.

Why the Strait matters: when the Iran war started in late February, fears of blocked shipping drove oil prices sharply higher. The price gap between U.S. crude and the global benchmark widened to $25 a barrel in March — a warning signal that traders saw genuine near-term supply squeeze. By June, those fears had eased. Oil had fallen from April's peaks. Physical spot prices (actual barrels changing hands in the market) had tumbled from $85 a barrel in May down to $69-70 by early July.

Then came the sudden reversal. No major news event triggered it. Instead, it looks like a collective market reassessment: traders stepped back and decided, "Maybe this disruption isn't temporary. Maybe we've got months of constrained supply ahead." That kind of thinking can reverse months of steady price decline very quickly.

Why this distinction matters: if traders simply reacted to breaking news of a tanker hit or a closed port, the move would follow one pattern. But if they're repositioning around a longer-term expectation of Strait risk, the price behavior will be different — particularly in options and spread trades where professionals bet on oil price differences.