Maritime traffic through the Strait of Hormuz was brought to a standstill on the evening of April 18, after Iranian armed forces warned they were reinstating “strict management and control” over the passage. The shutdown froze a key route that handles about 20% of global oil trade and immediately intensified pressure on global energy logistics.
British maritime authorities said several ships in the area received radio warnings from Iranian forces, reports later corroborated by multiple monitoring agencies. Around 2,000 vessels are now delayed or stranded, leaving an estimated 20,000 crew members in limbo.
Attacks on three ships near the strait
According to UK-based maritime security firm Pioner Technology, three commercial vessels—a tanker, a cruise ship, and a container carrier—were attacked near the strait on April 18.
The report said:
- Two of the ships were directly warned and then fired upon by units of Iran’s Islamic Revolutionary Guard Corps.
- A container ship was hit by an unidentified projectile about 25 nautical miles northeast of Oman, damaging several containers.
No fatalities were immediately reported, but shipping operators suspended or diverted routes as risk assessments were rapidly revised.
Iran imposes new controls and fee system
Tehran has declared the enforcement of new control measures over the narrow waterway, including what regional sources described as a tiered fee system for transit.
The move signals Iran’s push to assert unilateral oversight over the strait, amplifying regional tensions and complicating passage for commercial fleets already facing higher costs and insurance premiums.
Conflicting Iranian statements deepen uncertainty
The situation has been clouded by contradictory official messages from Tehran:
- Iran’s foreign ministry said the strait was “fully open.”
- Military commanders stated that “control” had been resumed and that restrictions would stay in place.
This divergence has left shipping companies and charterers uncertain about the legal and physical risks of entering or exiting the area, even when routes appear technically passable.
Link to U.S. blockade and ceasefire dispute
The abrupt shutdown on April 18 followed Iranian accusations that the United States violated a fragile ceasefire by maintaining a naval blockade on Iranian ports.
In a statement, Iran’s joint military command said control of the Strait of Hormuz had reverted to “restricted” status and would remain so until Washington lifts the blockade, which targets vessels departing from or docking at Iranian ports.
U.S. President Donald Trump rejected the accusation, warning Tehran against what he called “blackmail.” U.S. Central Command said the measures are designed to cut off Iran’s main revenue sources but “do not impede neutral vessels” transiting the strait en route to other destinations.
Record supply disruption and oil price shock
The disruption has fed directly into an already fragile energy market.
The International Energy Agency reported that global oil supply in March fell by 10.1 million barrels per day, calling it the largest single disruption on record. By early April, Brent crude was trading near $109 a barrel, up almost 80% since the start of 2026.
Price swings have been highly sensitive to each announcement from Tehran:
- On April 17, when Iran briefly declared the strait “completely open,” Brent prices fell 11% in a single session.
- The renewed closure on April 18 quickly reversed that decline, sending prices sharply higher again.
These whipsaw moves underline how verbal signals from military and political authorities around the Gulf can rapidly reset valuations across energy and related asset classes.
Market reaction and shift in risk appetite
The instability has prompted a broader reassessment of risk exposure tied to physical supply chains and geopolitically sensitive routes.
Market participants are moving away from projects and assets considered highly vulnerable to shipping disruptions or an escalation in the Gulf, and toward perceived havens or less trade-dependent sectors. Capital allocation has become more defensive as the possibility of wider regional conflict is re-priced into energy, shipping, and currency markets.
Shipping costs and insurance surge
The financial burden of operating near the Strait of Hormuz has risen sharply:
- War risk insurance premiums for transiting vessels have jumped from about 0.15% of a ship’s value to roughly 1.5%—a tenfold increase.
- Traffic through the strait has collapsed to roughly 13% of its normal daily volume.
- Only eight vessel transits were recorded on April 18, compared with an average of around 60 per day under normal conditions.
These added costs and delays are feeding into freight rates and, ultimately, into delivered energy prices and transport schedules worldwide.
Ongoing vulnerability of global supply chains
Repeated halts and reopenings in recent months have highlighted how exposed global supply networks are to geopolitical shocks in the Gulf.
The Strait of Hormuz remains a narrow and highly concentrated maritime chokepoint for crude oil and liquefied natural gas. Analysts warn that any prolonged restriction or additional military incident in the corridor is likely to:
- Tighten physical oil and gas availability in key importing regions
- Sustain elevated price volatility across energy benchmarks
- Disrupt shipping schedules and increase rerouting through longer, costlier paths
With no clear resolution to the U.S.–Iran standoff and contradictory messaging from Tehran, traders are preparing for further bouts of abrupt market repricing tied to developments in and around the strait.
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