Treasury Sanctions Iran's Persian Gulf Strait Authority Under OFAC List
OFAC added the Persian Gulf Strait Authority — the body Iran created to administer Hormuz transit fees — to its Iran sanctions list hours after fresh US strikes near Bandar Abbas.
The US Treasury’s Office of Foreign Assets Control on Thursday designated the Persian Gulf Strait Authority — the Iranian state body created to administer transit fees through the Strait of Hormuz — under its Iran sanctions program, formally barring US persons from dealing with the authority and exposing any foreign entity that pays it to secondary sanctions risk. Treasury announced the move hours after US forces conducted fresh overnight strikes on a military site near Bandar Abbas and the IRGC claimed a retaliatory strike on a US air base, turning a sanctions designation that had been telegraphed for weeks into a formal lever in an active strike cycle.
The designation was first reported in Middle East Eye’s live blog, which cited the Treasury action against the authority Iran’s Supreme National Security Council formally established on May 18 to manage Hormuz traffic and collect fees from transiting vessels. Treasury did not release the names of individual officials or affiliated entities at the time of publication, and the Office of Foreign Assets Control’s specially designated nationals list had not yet been updated with the full entity entry when the announcement was reported.
What the designation does
An OFAC designation under the Iran program freezes any US-jurisdiction assets of the named entity and prohibits US persons — including US-incorporated banks, insurers, classification societies and shipping firms — from any transaction with it. It also activates secondary sanctions exposure: non-US firms that knowingly facilitate significant transactions with the entity can be cut off from the US financial system. Applied to the Persian Gulf Strait Authority, that means a tanker operator that pays a Hormuz transit fee — whether through a Western correspondent bank, a Gulf-state intermediary, or a third-country front — becomes a candidate for OFAC enforcement against the operator, the bank, the insurer or all three.
In practice, the lever is aimed at the payment rail, not the strait itself. The authority cannot meaningfully collect a fee if every plausible payer is staring at a US enforcement action for paying it. The designation does not, by its own terms, prevent any vessel from physically transiting Hormuz; it prevents the financial transaction that the authority was set up to capture.
A telegraphed move
The action follows weeks of explicit US warnings. On May 2, Treasury issued a public warning that paying Iranian Hormuz tolls could trigger sanctions enforcement, language that named the toll mechanism but stopped short of a formal entity designation. Secretary of State Marco Rubio earlier this month framed any Hormuz toll as a non-starter, and the administration has rejected proposals — floated in mediator channels — that Oman could collect or co-administer the fees as a face-saving compromise.
President Trump on Thursday threatened to “blow up” Oman if Muscat were to join Iran in imposing fees on Hormuz traffic, Middle East Eye reported. Oman has been the principal US-Iran mediator for two decades, and the threat against the mediator landed the same day Treasury moved against the underlying institution. Trump separately said he will not ease sanctions on Iran as part of any deal, language that closes off the most common bargaining chip in past US-Iran negotiation rounds and that Iranian officials have previously cited as a precondition for movement.
The kinetic backdrop
The designation does not stand on its own. US forces struck targets near Bandar Abbas overnight and downed four Iranian drones, the BBC reported, extending the strike cycle that began over the weekend. The IRGC said Thursday morning it had hit a US air base in retaliation, claiming a “more decisive” response would follow further American action and warning that responsibility for escalation falls on US host states.
Iran’s foreign ministry condemned the US attack and expressed solidarity with Oman following Trump’s threat against Muscat, a framing that puts Tehran and the mediator on the same diplomatic page for the first time in the current cycle. President Trump separately warned he may have to “finish the job” if Iran does not move on a deal, per the Guardian’s live coverage.
Markets
Crude rose on the news, with the strike cycle and the designation reinforcing each other in the tape. MarketWatch reported that oil prices climbed after the latest round of strikes between the US and Iran, with the action seen as pushing any peace deal further into the future. Tanker day-rates on Gulf routes and war-risk insurance premia for Hormuz transits — the two market signals most directly exposed to a payments-side sanctions move — will absorb the OFAC action across the European and Asian sessions.
The market read on a Treasury designation is structurally different from the read on a strike. A strike prices a probability of supply disruption; a designation prices a probability of enforcement against firms that try to keep cargo moving. Both raise costs at the loading port, but through different channels — operational risk for the strike, compliance risk for the designation.
What to watch
Three questions follow the designation.
First, how the SDN entry reads when it is published in full. The scope — whether OFAC names individual authority officials, affiliated front companies, or correspondent banks — determines how much of the payment ecosystem is captured by Thursday’s action versus what is held in reserve for the next tranche.
Second, what Gulf-state and Asian buyers do. China, India and several GCC refiners have historically continued purchases through OFAC-designated Iranian entities under various workarounds. The Persian Gulf Strait Authority is a different kind of target — it sits on the chokepoint itself, not on the oil — and the question is whether any major buyer publicly commits to non-payment or quietly routes around the rule.
Third, whether the kinetic and financial tracks stay in step. If Treasury actions continue to land in the same news cycle as CENTCOM strikes, the administration is signaling that the two instruments are coordinated and that the pace of designations will track the pace of military action. If a designation lands alone — without an accompanying strike — that decoupling would itself be a signal.
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