Source Overview

TankerTrackers.com Inc. is a commercial maritime intelligence firm providing satellite imagery, shoreside photography, and real-time AIS (Automatic Identification System) data analysis to corporate subscribers. The firm tracks oil exports from 25+ countries including Iran, Iraq, Kuwait, Saudi Arabia, UAE, and others. For the Hormuz crisis, TankerTrackers provides proprietary satellite-based verification of dark fleet operations, STS (ship-to-ship) transfers, and actual cargo flows — data that is not visible through conventional AIS tracking because vessels go dark (transponders off). Tier 3 source — valuable for corroboration and granular detail but proprietary commercial data with limited public verification.

Key Claims & Data Points

Dark Fleet STS Operations (June 6)

  • 12 ships with non-Iranian Middle Eastern barrels doing STS transfers on June 6 alone: TankerTrackers identified 12 ships with non-Iranian Middle Eastern barrels conducting STS transfers outside of Hormuz on June 6 alone.
  • "This is oil coming from Iran's Arab neighbors": TankerTrackers explicitly stated the transferred oil is from Iran's Arab neighbors (Saudi Arabia, UAE, Kuwait, etc.) — not Iranian oil.
  • "Yet another reason why oil isn't $200 a barrel right now": TankerTrackers' own characterization of the significance — the dark fleet workaround is the mechanism preventing even more extreme price spikes.
  • 16 tankers clustered for STS off Oman over the weekend: The gCaptain/Bloomberg reporting (published June 10) described 16 tankers clustered together off the coast of Oman to transfer millions of barrels of oil stranded in the Persian Gulf. A month ago, that area had been entirely empty.

~90 Tankers Still Trapped in Gulf

  • ~90 non-Iranian large oil tankers still trapped in Persian Gulf: Per Georgios Sakellariou, freight analyst at Signal Maritime, approximately 90 non-Iranian large oil tankers remain trapped, compared with roughly 160 in early April.
  • Roughly 25% have escaped: Before the most recent transits, roughly a quarter of the non-Iranian large oil tankers trapped inside the Persian Gulf had escaped.
  • "The stream of dark transits has increased": Sakellariou confirmed the reduction in trapped vessels is visible in the data, though still not enough to return to prewar levels.

Government-Owned Vessels Dominating Dark Transits

  • "Mainly or exclusively government-owned ships": Larry Johnson, head of freight at Mercuria Energy Group, confirmed the dark transit trend: "They're mainly or exclusively government-owned ships that are making it through." These vessels "seem to have channels of communication and means of securing safe passage somehow, some way."
  • Kuwait Oil Tanker Co. vessels: At least two supertankers (each capable of hauling 2 million barrels), both managed by Kuwait Oil Tanker Co., crossed Hormuz late last month and began signaling off the coast of Kuwait. Neither had broadcast a signal since crossing.
  • ADNOC also moving crude dark: Abu Dhabi National Oil Co. (ADNOC) is among the firms that has moved crude through Hormuz with transponders off to avoid detection, per Bloomberg. ADNOC has continued shipping barrels at a healthy rate across the strait in recent weeks.

Operational Details of Dark Transits

  • Nighttime transits with lights off: Ships crossing are doing so under cover of darkness with lights on board switched off, per people with knowledge of the transits.
  • Radio silence: Crews have been instructed to stay off the radio.
  • AIS off: Vessels operating with AIS disabled.
  • Minimized radar use: Per INTERTANKO advisory (see gCaptain source), vessels in the Omani route should minimize radar use.

Flow Increase

  • ~2 mbd flowing out of Gulf: Rapidan Energy Group estimates approximately 2 million barrels a day of oil and related products are now flowing out of the Gulf — far below normal but much higher than earlier in the conflict.
  • Prices dropped ~30% from wartime peak: These flows, combined with plunging Chinese buying, surging US exports, and pipeline workarounds, have helped bring oil prices down almost 30% from their peak at the height of the war.

Countries Tracked by TankerTrackers

TankerTrackers monitors exports from: Angola, Congo, DRC, Ecuador, Eq Guinea, Gabon, Guyana, Iran, Iraq (N), Iraq (S), Israel, Kazakhstan, Kuwait, Libya, Niger, Nigeria, Norway, Oman, Russia, Saudi Arabia, Sudan, Syria, USA, Venezuela, Yemen.

Significance

TankerTrackers provides the granular satellite-verified evidence for the dark fleet workaround that is preventing even more extreme oil price spikes. The 12 STS transfers on June 6 alone is a key operational data point — it quantifies the scale of the workaround. The ~90 still-trapped figure is the most current tanker stranding count. The explicit attribution of these barrels to "Iran's Arab neighbors" confirms the workaround is working for non-Iranian Gulf producers. This data is consistent with the Project Freedom reporting and the INTERTANKO advisory.