Aging tonnage and the shadow fleet: the scrutiny gap widens

The tanker market’s fastest-growing segment is one no owner wants to be counted in. Broker estimates put the “shadow” or “dark” fleet at around 1,140 oil tankers in August 2025 — more than 18% of the global oil tanker fleet — while later tallies catalogue well over 1,300 vessels, roughly one in every five oil tankers. These ships are typically 15 to 25 years old, and many are past normal commercial retirement age, bought by opaque shell owners specifically to keep sanctioned crude moving.

Two problems compound the age. First, insurance: shadow vessels largely lack recognised International Group P&I cover, relying instead on sanctioned or unknown insurers and, in some cases, fraudulent certificates. Second, opacity: frequent flag-hopping between small open registries and manipulated tracking make a vessel’s true condition and history hard to establish. The result is aging tonnage carrying full cargoes with thin or unverifiable safety and pollution-liability backing — an oil-spill risk that sits outside the normal accountability chain.

Enforcement has moved from lists to the water. Baltic coastal states — Britain, Denmark, Sweden, Poland, Finland and Estonia — now request insurance proof from transiting tankers and conduct port-state-style checks at sea; Danish authorities reported inspecting scores of vessels in 2025 even as hundreds of sanctioned crossings continued, with only a handful ending in detention. The EU has cumulatively sanctioned several hundred shadow-fleet vessels, and individual seizures have multiplied. For the compliant tanker, the practical effect is a rising bar: inspectors, insurers and charterers now scan every vessel for the tell-tales of the dark fleet.

Apeks view — In a market where a fifth of tankers cannot prove what they are, the ability to prove what you are becomes commercial capital. Clean, verifiable records of a vessel’s condition, maintenance and history are exactly what separate a trusted ship from a suspect one at an insurance check or a port-state boarding — and that separation is only going to be priced more sharply.