The Strait of Hormuz vessel blacklist has created a new pre-chartering compliance problem for cargo owners and ship operators. Iran’s Persian Gulf Strait Authority (PGSA) says vessels that violate its Hormuz protocols may face restrictions on later voyages, including fines, detention or confiscation. It also says cargo owners should check its Non-Compliant Vessels list before chartering and that a vessel cooperating with a listed ship through ship-to-ship transfer, transshipment or similar activity can itself be added to the list. Fresh Aug. 24 reporting by Reuters says the current blacklist covers 45 tankers, making the scale of the screening problem more concrete.
Direct answer: do not treat one blacklist check as sufficient clearance. Before fixing a vessel for Persian Gulf or Hormuz trade, identify the ship by IMO number, check the current PGSA non-compliance position through legally permissible channels, separately screen the vessel and related parties under the sanctions regimes that apply to your transaction, review recent STS or transshipment relationships, and escalate uncertain cases to the relevant P&I club, flag-state channel, sanctions/compliance team or legal adviser.
Critical distinction: a PGSA Non-Compliant Vessels listing is not the same thing as an OFAC, UN, UK or EU sanctions designation. PGSA itself is designated by the U.S. Treasury. The Iranian transit-compliance question and the sanctions-compliance question must therefore be checked separately.
What changed in the Strait of Hormuz vessel blacklist rule?
The new information is not simply that Iran can inspect or restrict ships in the Strait. PGSA has now made vessel-list status and association with listed ships operationally relevant to chartering decisions. Reuters reported on Aug. 24 that the current Non-Compliant Vessels list covers 45 tankers, providing a concrete reported scope for a list that TPS had previously treated without publishing an unverified vessel count.
Important evidence boundary: the 45-tanker figure is attributed to Reuters’ Aug. 24 reporting. TPS has not independently extracted and reconciled the complete live PGSA list vessel-by-vessel, including every IMO number, owner and operator. The figure should therefore not be treated as a separately verified TPS count.
45 tankers reported
Reuters reports that the current PGSA Non-Compliant Vessels list covers 45 tankers. TPS has not independently reconstructed the complete live list.
Check before chartering
PGSA says cargo owners should review its Non-Compliant Vessels list before fixing a ship.
Association risk
PGSA says STS, transshipment or similar cooperation with a listed vessel can lead to the cooperating vessel being added to the list.
Delisting exists
PGSA says listed vessels may request removal with supporting justification, but the detailed criteria and timeframe remain unclear.
The practical shift is important. A charterer can no longer look only at the proposed vessel’s own recent Hormuz transit history. Under PGSA’s stated approach, recent counterparties and cargo-transfer relationships may also matter.
What should a cargo owner check before chartering?
Confirm the exact vessel identity
Use the IMO number as the primary identifier. Vessel names, flags, managers and registered owners can change, so a name-only search can produce the wrong compliance result.
Check the current PGSA non-compliance status
Determine whether the vessel is currently reported or shown as non-compliant under PGSA’s system. Record the source date because list status can change. Reuters currently reports 45 tankers on the list, but TPS has not independently extracted the complete live vessel roster.
Screen sanctions separately
Check the vessel, registered owner, operator, manager, relevant beneficial ownership and other transaction parties against the sanctions regimes that apply to the voyage, cargo, parties and financial chain. Absence from PGSA’s list does not prove sanctions clearance, and a PGSA listing does not by itself establish an OFAC or other sanctions designation.
Review recent STS and transshipment relationships
Because PGSA says cooperation with listed vessels can create secondary-listing risk, review recent ship-to-ship transfers, transshipment counterparties and voyage history where that information is available and relevant.
Check the contract and escalation path
Review sanctions clauses, trading warranties, lawful-trade provisions and allocation of delay, detention, deviation and cancellation risk. Escalate uncertain cases rather than treating a public article or one list as the final legal go/no-go authority.
Why PGSA status and sanctions status are different
PGSA’s NCV mechanism is an Iranian transit and enforcement position. U.S. sanctions are a separate legal framework. The U.S. Treasury designated PGSA in May 2026 and has warned that dealing with, receiving services from or otherwise transacting with designated Iranian maritime entities can create sanctions exposure depending on the parties and activity.
This creates an unusual compliance problem: a party may want to understand or resolve a vessel’s Iranian transit status while also needing to avoid activity that could violate sanctions applicable to that party.
Do not infer a universal legal answer from PGSA’s announcement. The International Maritime Organization has separately reaffirmed that transit passage through international straits should not be impeded or suspended and that regulation of navigation in such straits must operate within the international maritime framework. TPS is therefore reporting PGSA’s stated enforcement position, not declaring that every announced restriction is universally accepted or enforceable under international law.
Can STS with a listed ship put another vessel at risk?
Under PGSA’s stated policy, yes. The authority says a vessel that cooperates with a listed ship through STS, transshipment or similar operations can itself be added to the Non-Compliant Vessels list.
What remains unclear is the exact boundary of that rule. The announcement does not yet establish a public, detailed standard for:
- how far back PGSA looks at historical STS activity
- whether every STS interaction is treated equally
- what evidence PGSA uses to establish cooperation
- whether a charterer can rely on a time-limited clean-history check
- how quickly a secondary listing can occur
- what evidence is sufficient for delisting
That uncertainty is why the decision should not be reduced to a static copied blacklist.
Is the PGSA blacklist the same as a sanctions list?
No. Treat them as separate evidence layers.
| Check | What it tells you | What it does not prove |
|---|---|---|
| PGSA NCV status | Iran’s current non-compliance position toward the vessel under its Hormuz regime | That the vessel is designated under OFAC, UN, UK or EU sanctions |
| OFAC / other sanctions screening | Whether the vessel or transaction parties appear under the relevant sanctions framework and whether ownership/control rules may apply | That Iran will permit or refuse a Hormuz transit |
| STS / voyage-history review | Whether recent vessel relationships or movements create additional factual risk indicators | That a legal violation occurred |
| Flag / P&I / legal review | How the vessel’s actual jurisdiction, cover and contractual position should be handled | A guarantee of safe passage or zero enforcement risk |
What does the reported 45-tanker scope mean for charterers?
The 45-tanker figure matters because it turns the NCV mechanism from an abstract compliance possibility into a materially sized screening universe. It does not, however, mean every one of those ships creates the same risk for every cargo owner.
Before fixture, the relevant question is not simply whether a ship appears in a reported list. Charterers should reconcile the proposed vessel by IMO number and then examine:
- current PGSA status
- registered owner, operator and manager
- sanctions exposure under the regimes relevant to the transaction
- recent STS or transshipment counterparties
- recent voyage and Hormuz history where relevant
- P&I and flag-state guidance
- charterparty sanctions, trading, detention, deviation and cancellation provisions
A vessel-name match without IMO reconciliation is not strong enough for a fixture decision because vessel names, ownership structures, flags and management arrangements can change.
What if the vessel is not on the PGSA list?
That is useful information, but it is not full clearance. A vessel can be absent from one list and still create risk because of ownership, management, cargo, sanctions, deceptive-shipping indicators, recent counterparties, AIS behaviour, flag issues, insurance conditions or charterparty terms.
NOT LISTED ≠ SANCTIONS CLEARED ≠ TRANSIT GUARANTEED.
What if the vessel is on the PGSA list?
A listed status should trigger escalation before fixture or before a planned Hormuz transit. The immediate questions are:
- Is the listing current and tied to the correct IMO number?
- What event or alleged protocol violation caused the listing?
- Does the proposed voyage actually require Hormuz passage?
- What sanctions regimes apply to the cargo owner, charterer, owner, bank, insurer and other counterparties?
- Can the parties lawfully communicate with or seek services from the relevant Iranian authority?
- What does the P&I club, flag state or sanctions counsel advise?
- What do the charterparty’s sanctions, safe-port, deviation, detention and cancellation clauses allow?
PGSA says a listed vessel may apply for removal with supporting justification. TPS has not established a public service-level timeframe or detailed delisting test.
Should India-linked cargo owners care?
Yes when an India-linked shipment uses a vessel, counterparty or route exposed to Persian Gulf or Hormuz transit risk. That can include crude, LPG, LNG, chemicals, fertilisers, containerised cargo and other Gulf trades.
This does not mean every India-bound ship uses Hormuz or that India faces a confirmed fuel shortage. For the wider energy and strategic context, see ThePulseSignal’s explainer on why the Strait of Hormuz matters to India.
What about parties with U.S. sanctions exposure?
They need particular care because PGSA itself is U.S.-designated. OFAC guidance warns that transactions or services involving designated Iranian maritime entities can create sanctions risk. The exact result depends on the parties, ownership, activity and any applicable authorization or exception.
TPS therefore does not advise a U.S. person—or any party subject to a relevant sanctions regime—to contact, pay or obtain services from PGSA merely because the Iranian authority says a vessel owner can seek delisting. That is a case for the party’s sanctions-compliance process and legal advisers.
What the current evidence does not establish
- that TPS has independently extracted and verified every vessel on the live PGSA list
- that the Reuters-reported 45-tanker count will remain unchanged as the PGSA list evolves
- that every vessel reported on social media as blacklisted is actually on the current PGSA list
- that every STS interaction automatically creates secondary-listing exposure
- that Iran has already fined, detained or confiscated every listed vessel
- that a PGSA listing automatically creates an OFAC, UN, UK or EU designation
- that absence from the PGSA list makes a vessel safe to charter
- that the international-law status of every PGSA enforcement action is settled
What should charterers monitor next?
- additions to or removals from the PGSA Non-Compliant Vessels list
- changes to the reported 45-tanker scope
- the first independently documented enforcement cases tied to the NCV mechanism
- clarification of the STS/transshipment look-back rule
- PGSA delisting criteria and timing
- new OFAC or other sanctions guidance responding to the mechanism
- P&I club and flag-state circulars
- changes to the wider Iran-U.S. Hormuz transit arrangement
- material recovery or further deterioration in commercial Hormuz traffic
Frequently asked questions
What is the Strait of Hormuz vessel blacklist?
It is PGSA’s Non-Compliant Vessels mechanism for ships Iran says have violated its Hormuz protocols. PGSA says listed ships can face restrictions on future voyages and tells cargo owners to check the list before chartering. Reuters reported on Aug. 24 that the current list covers 45 tankers.
Has TPS verified all 45 tankers independently?
No. The 45-tanker scope comes from current Reuters reporting. TPS has not independently extracted and reconciled the complete live PGSA list by IMO number, ownership and operator, so the article does not reproduce a supposedly complete blacklist.
Can a vessel be listed because it did STS with another listed ship?
PGSA says cooperation through STS, transshipment or similar operations with a listed vessel can lead to the cooperating vessel being added to the list. The detailed scope and look-back period remain unclear.
Is a PGSA-listed vessel automatically OFAC sanctioned?
No. PGSA status and OFAC sanctions status are separate checks. Each must be verified independently.
Is a vessel safe to charter if it is not on the PGSA list?
Not necessarily. Sanctions, ownership, management, voyage history, STS counterparties, insurance and contractual restrictions can still create risk.
Can a listed vessel be removed?
PGSA says listed vessels may submit a request with supporting justification. TPS has not established a detailed public delisting standard or guaranteed processing time.
Does this mean the Strait of Hormuz is completely closed?
No. Current evidence shows severely constrained traffic and selective passages, not a complete absence of commercial movement.
Verification note
The core chartering and secondary-listing rule was established from PGSA’s official Aug. 23 statement as captured in the TPS Signal Register. Fresh Reuters reporting on Aug. 24 provides the current reported scope of 45 tankers. TPS separately checked U.S. Treasury material on PGSA’s sanctions status and IMO material on international transit passage. TPS has not independently extracted and reconciled the complete live PGSA vessel list by IMO number, ownership and operator, so the 45-tanker figure remains an attributed reported count rather than a separately verified TPS blacklist.
Last verified: August 24, 2026.