Since mid-July, nearly 62% of tanker crossings through the Strait of Hormuz have occurred with their Automatic Identification System (AIS) tracking turned off, according to recent data from Signal Group. This lack of visible signals creates significant challenges for oil traders, shipowners, and regulators, complicating voyage planning and sanctions compliance amid rising operational risks in one of the world's most critical energy routes.

The majority of AIS-dark transits involve crude carriers, with 79% operating without active signals, while 50% of clean petroleum tankers were similarly untrackable. Additionally, over half of these tankers are linked to non-transparent ownership entities, further obscuring vessel provenance and cargo details. This gap in tracking hinders accurate reconstruction of tanker movements, complicating the monitoring of oil flow that represents 20% of global petroleum consumption.

While this practice does not inherently indicate illegal activity—ships may disable AIS for safety under IMO rules—its increasing frequency coincides with elevated insurance costs and commercial risk premiums due to regional tensions. The dual visibility picture now challenges industry stakeholders trying to assess oil export volumes, routes, and owners in the Persian Gulf's strategically vital but opaque maritime environment.