Iran Blocking Strait of Hormuz: What It Means for Oil Prices

Crude oil prices jumped again on July 15, with the United States Oil Fund (AMEX:USO) trading at 120.17 dollars, up 2.2% on the day, as the standoff over Iran blocking the Strait of Hormuz kept traders on edge. USO now sits well inside its 52 week range of 102.42 to 154.08, and an RSI near 55 suggests the market isn't overheated yet, just anxious.

What Triggered the Latest Spike

The ceasefire that had briefly calmed things down between the United States and Iran broke apart in mid July. Over the weekend of July 12 and 13, American forces struck more than 80 targets inside Iran, and Iran's Revolutionary Guard answered by shutting the Strait of Hormuz once again. Hours later, President Trump posted on Truth Social that the United States was reinstating a naval blockade of Iran's coastline, ports and oil terminals, and would charge a 20% toll on cargo moving through the Strait. He called the policy the Iranian Blockade, insisting it targets only Iranian ships and customers while keeping the waterway open to everyone else.

Brent crude jumped nearly 8% to 82.03 dollars and West Texas Intermediate rose by a similar amount to 77.10 dollars in the immediate aftermath, before markets had even fully digested the announcement. Traffic through the Strait told its own story: just six vessels passed through in a 12 hour window on July 11, down from a normal pace of 18 to 22 ships a day before hostilities resumed. Roughly 230 loaded oil tankers are now sitting in the Gulf with no clear path to deliver their cargo.

Why Hormuz Carries So Much Weight in Oil Markets

Before the latest round of strikes began in late February, about a quarter of the world's seaborne oil trade and one fifth of global liquefied natural gas moved through the Strait of Hormuz daily, based on figures from the Congressional Research Service. There is no quick workaround when that channel gets disrupted. Saudi Arabia can send some crude overland to the Red Sea, and Oman sits in a position to route around the chokepoint, but Iraq, Kuwait, Qatar and the United Arab Emirates have no such luxury. For them, it's Hormuz or nothing.

That helps explain why Brent spiked all the way to 114 dollars back on May 4, during the worst stretch of fighting, before easing as the ceasefire took hold and shipping traffic recovered. The events of July 13 wiped out much of that recovery. Whether prices climb back toward that May peak depends largely on how long this latest flare up drags on.

A Legal Fight Over Who Actually Controls the Strait

The International Maritime Organization pushed back hard against the toll idea, telling reporters there is no legal basis for charging mandatory fees simply to pass through an international strait. Its 40 member council, which includes the United States, has said transit rights through straits like Hormuz cannot be blocked, hindered or suspended by any single nation.

The confusion runs deeper than legal technicalities. U.S. Central Command said on July 13 that the Strait remained open and that American forces were there to keep it that way. Iran's Revolutionary Guard, on that same day, insisted it was closed. Two militaries, two flatly contradictory claims about the same stretch of water.

Is Iran Blocking the Strait of Hormuz, or Just Threatening To

Analysts studying the situation think Iran's grip on shipping traffic will linger well beyond this news cycle. Saul Kavonic of MST Financial expects Iranian efforts to control the Strait to keep tanker traffic below half of pre war levels for months, punctuated by more flare ups. Tony Sycamore at IG Australia noted that the United States and Iran never settled the underlying legal question of whether Hormuz counts as international waters or partly Iranian territory, a dispute that sat quietly inside the ceasefire agreement the entire time.