The US Treasury and State Department on Thursday sanctioned 22 tankers and dozens of entities tied to Iranian oil exports, including the Cameroon-flagged SHENZHEN, which Treasury says has moved 3.5 million barrels of Iranian crude since November 2025.

Treasury designated 17 vessels and their operators under Operation Economic Outcast, a campaign launched August 24 to choke off Tehran's remaining petroleum revenues. The State Department added another five vessels, 10 entities and six individuals.

"Treasury is starving the tyrannical regime in Tehran of the money it uses to wage war in the region, and we will continue exposing those who enable the regime's oil sales," Treasury Secretary Scott Bessent said.

Which tankers made the list?

The latest designations reach across more than a dozen flag states and a thicket of shell companies registered in the Marshall Islands, Hong Kong, China and the British Virgin Islands. Named vessels include:

• SHENZHEN (IMO 9276561, Cameroon) — 3.5 million barrels of Iranian crude since November 2025
• TINA 5 (IMO 9237761, Vanuatu) — 1.5 million barrels of Iranian crude in August alone
• STARWAY (IMO 9273246, Panama) — more than 3 million barrels of Iranian naphtha since 2025
• KING CHAIN (IMO 9277761, Cameroon) — several million barrels of Iranian methanol to China since 2023

Other targeted ships have carried fuel oil, LPG and petrochemical products to Asia and the Middle East. Treasury also removed HAKUNA MATATA (IMO 9354167) and PINOCCHIO (IMO 9400112) from the list after deeming them sold to non-sanctioned owners.

How big is the shadow fleet really?

Here's the tension. Treasury says Thursday's move "effectively neutralize[s] the vast majority of Iran's remaining shadow fleet network." Maritime tracker TankerTrackers.com disagrees. It counts 173 Iran-linked tankers still outside US sanctions.

That gap matters. Each vessel Treasury catches can be renamed, reflagged and put back into service. The network shifts. Treasury says it will keep chasing.

What does this change for tanker owners and charterers?

Three things. First, the owners and operators behind the 22 named ships — and their parent companies — now face blocked property in US jurisdiction. Foreign banks clearing meaningful transactions with them risk secondary sanctions.

Second, compliant tonnage in the Persian Gulf VLCC and Aframax trades stays tight. The same campaign runs alongside a US naval blockade that has already curtailed Iranian crude flows to Asia. That removes cheap, long-haul barrels from the spot market and props up freight rates for legitimate operators.

Third, the legal paperwork gets heavier. Shipowners and their banks must now rerun sanctions screening on every fixture touching the Strait of Hormuz, the Gulf of Oman and the approaches to the Persian Gulf. Brokers report extra compliance time per deal.

A separate incident underlines the regional risk. A commercial vessel was struck by a projectile in the Persian Gulf on Friday, the second reported attack on shipping inside the Gulf in three days. The blast sparked an onboard fire. No operator has been named.

The two events move in the same direction. They shrink the pool of willing Iranian-crude buyers and tighten the supply of compliant tonnage willing to call at Iranian terminals.

Looking ahead, watch the 173-vessel gap between Treasury's claim and TankerTrackers' count. If sanctions stick and the naval blockade holds, Iran's export volumes drop further and VLCC tonne-mile demand stays elevated. If shadow fleet operators find new flags and shell companies fast, expect another round of designations before year-end.