On July 12, 2026, Iran's maritime authority announced that the Strait of Hormuz—one of the world's most critical shipping lanes—is "currently not possible" to transit due to what it called illegal US actions IRNA. It was the clearest statement yet that Iran now treats the waterway as genuinely closed rather than simply disputed.

The announcement followed two others the same morning. Iran's military said a second vessel had been hit in the strait and that a US base in Qatar had been targeted IRNA. Another statement said Iran had taken control of the strait and would hold it "with strength" IRNA. Together, these three announcements moved the message from "there's trouble" to "the waterway is closed."

But here's the puzzle: oil prices aren't reacting the way you'd expect. Brent crude—the global benchmark oil price—was trading around $78.93 a barrel on July 13, up about 4% for the day but down 5% over the past month Trading Economics. To put this in perspective, the Strait of Hormuz normally handles about one-fifth of all oil shipped by sea worldwide. If it truly shuts down, prices should spike significantly. Instead, they're relatively calm.

This raises a basic question: either oil is still flowing through somehow despite Iran's closure announcement, or traders don't yet believe the closure will last. The gap between what Iran is saying and what the price signals suggest is the real story.

To understand why traders are skeptical, look back at what's happened over the past five months. On July 7, Iran struck three commercial vessels and crude rose 3% that day Reuters. A day later, prices jumped 5% after President Trump threatened new strikes Reuters. But by July 9, crude fell roughly 2% as worries about economic slowdown took over Reuters. On July 10, when news outlets called the strait "effectively shut down," oil barely spiked to $76 before sliding back Reuters. Al Jazeera on July 8 noted Brent briefly moved above $76, the highest in two weeks Al Jazeera.

The pattern is clear: each "closure" announcement produces a quick price bump that fades almost immediately. MarketWatch reported on July 8 that energy markets were scrambling in "full-conflict conditions" MarketWatch. But older, undated reports claimed oil had hit $100 a barrel—a number that's disappeared from recent data. Other reports mentioned prices reaching $98 before collapsing. None of these numbers match where oil is actually trading on July 13.

Even expert forecasters disagree on where prices should be. BloombergNEF predicted in January that Brent could average $55 for 2026 under normal conditions, but could hit $91 late in the year if Iran causes disruption BloombergNEF. Bloomberg's June 21 report had Brent at under $78 Bloomberg. CNBC cited analysts in May who said prices could hit $120–$150 if the strait stays truly blocked—something that hasn't happened despite months of closure talk. Iran's new supreme leader vowed in March to keep blocking the strait as prices jumped, a threat now echoed this week.

What matters going forward is whether this week's announcement is different. It's the strongest official closure claim yet—coming directly from Iran's maritime authority rather than being inferred from ship-tracking data. If it's real, shipping companies will reroute around Africa, insurance costs will jump, and oil traders will finally reprice for a genuine supply crunch. But the track record suggests traders will stay skeptical until they see actual cargo diversion and higher insurance premiums—the kind of hard evidence that shows up in shipping data long before it appears in a news headline.