The Dark Fleet in 2026: Shadow Tankers & AIS Evasion
A state-of-the-fleet intelligence brief on the size, flags, age, insurance gap, and primary trades of the global dark tanker fleet — and the 2025–2026 regulatory response now squeezing it.
The "dark fleet" — also called the shadow or parallel fleet — is the cohort of aging tankers that move sanctioned crude and refined products outside the Western insurance, finance, and oversight system. By 2026 it is no longer a fringe phenomenon. S&P Global counts roughly 940–980 vessels at the fleet's core, around 17–18.5% of the world oil-tanker fleet, while broader trackers such as Windward and Lloyd's List Intelligence count well over a thousand tankers once gray tonnage and false-flagged ships are included. Analysts at the KSE Institute estimate the shadow fleet now carries roughly 70% of Russia's seaborne crude, plus the overwhelming bulk of Iranian and Venezuelan exports. This brief is the quantitative companion to our shadow fleet overview: how big the fleet is, who flags it, how old it is, where the insurance gap sits, and what the EU's 18th, 19th and 20th sanctions packages have actually done to it.
Note on figures. No single authority maintains a definitive census of the dark fleet; its whole purpose is to evade enumeration. Where credible trackers report different totals, we present a range and attribute each figure to its source rather than asserting a single number. Figures below reflect the most recent publicly reported estimates available at time of writing.
How Big Is the Dark Fleet in 2026?
Headline estimates and why they diverge
Estimates of dark-fleet size vary because each tracker draws the boundary differently. Some count only vessels demonstrably engaged in sanctioned trades; others include all tankers operating without mainstream Western insurance or with opaque ownership. The result is a spread — from roughly 940 core tankers (S&P Global) to more than 1,900 active tankers (Windward, including gray tonnage) — rather than one authoritative figure. HIGH CONFIDENCE
| Source / tracker | Scope | Reported magnitude |
|---|---|---|
| S&P Global (May 2025) | Unique ships in shadow trades | ~940 ships, ~17% of the world oil-tanker fleet |
| S&P Global Commodities at Sea (2026) | Parallel fleet >27,000 dwt | ~978 tankers, ~127m dwt, ~18.5% of capacity |
| BRS (Aug 2025) | Shadow oil tankers | ~1,140 tankers, >18% of global tankers |
| Lloyd's List Intelligence | Tankers in sanctioned oil trading | ~1,423 tankers; ~921 under active US/EU/UK sanctions |
| Windward (Q3 2025) | Dark + gray fleet | >1,900 dark tankers + >1,200 gray vessels |
The convergence point across sources is directional rather than precise: the fleet has more than tripled since 2022 and continued to grow through 2025, even as scrapping and designation churn the underlying roster. For the mechanics of how these vessels disappear from tracking, see our methodology on AIS gap analysis.
Share of sanctioned trades
The more decision-useful metric is not vessel count but cargo share. KSE Institute analysis found Russia's shadow fleet carries roughly 70% of the country's seaborne crude, and the Centre for Research on Energy and Clean Air (CREA) tracks the figure month by month. In September 2025 CREA put the sanctioned-shadow-tanker share of Russian crude exports at 69%, with G7+ tankers at ~22%; in November it was 65%, with G7+ tankers at 27%. Reported
| Month (2025) | G7+ tankers | Sanctioned shadow tankers | Non-sanctioned shadow |
|---|---|---|---|
| September | ~22% | 69% | ~9% |
| November | 27% | 65% | 7% |
| December | 26% | 68% | 6% |
| Origin | Dark-fleet role | Reported figures |
|---|---|---|
| Russia (crude) | ~70% of seaborne crude (KSE) | Only ~21% of crude shipped under IG insurance (Aug 2025) |
| Iran (crude) | Near-total reliance on shadow tonnage | 251 vessels loaded Iranian oil in 2025; 217 (86%) sanctioned |
| Venezuela (crude) | Heavy reliance; shares Iran's network | Exports ~711k b/d in 2025, a six-year high |
Flag-State Distribution
The flags of convenience that absorb the fleet
Dark-fleet vessels concentrate under a small set of open registries that combine low fees, light enforcement, and rapid re-flagging. The signature of 2025 was flag-hopping at scale: Lloyd's List Intelligence recorded a 201% increase in flag movements within the sanctioned fleet over the year. As Panama and Liberia de-flagged sanctioned tonnage under Western pressure, operators migrated to weaker registries — and, increasingly, to the Russian flag itself, which grew about 38% in deadweight terms since 2022. Our standing analysis lives in the flag-of-convenience methodology. HIGH CONFIDENCE
| Flag category | Examples cited by trackers | 2025 pattern |
|---|---|---|
| Traditional large open registries | Panama, Liberia, Marshall Islands | De-flagging sanctioned ships; Panama removed ~70 ships |
| Smaller / pressured registries | Gabon, Cook Islands, Palau, Comoros, Barbados, Gambia | Absorbed dark tonnage then purged it; Barbados flagged out ~46 ships |
| Russian flag | Russia | Growing destination as ex-Gambia/Gabon tonnage settles |
| False / fraudulent flags | Registries that disown the vessel | IMO GISIS listed 367 tankers as false-flagged (Apr 2026) |
A recurring OSINT signature of dark-fleet vessels is the "flag of no nation": a tanker broadcasting a flag the named registry publicly states it never issued or has revoked. Gabon is the textbook case — its registry, run by a UAE-based private company, was briefly the world's fastest-growing (a reported ~675% peak growth rate) before Sovcomflot tonnage churned out through multiple managers and flags. This is one of the highest-confidence red flags in screening and frequently precedes a formal designation.
The Regulatory Response: 2025–2026
EU vessel listings have become the primary lever
The EU's response has shifted from price-cap enforcement toward direct vessel-by-vessel listing, denying named tankers access to EU ports and services. The 19th package (adopted 23 October 2025) added 117 vessels to bring the cumulative EU total to 557; a December 2025 designation of a further 41 vessels pushed the list toward 600, and the 20th package (April 2026) carried it to ~632. Reported
| Action | Date | Vessels added | Cumulative EU total |
|---|---|---|---|
| 18th package | 18 Jul 2025 | Large tranche; lower dynamic oil-price mechanism | ~440 |
| 19th package | 23 Oct 2025 | 117 | 557 |
| Dec 2025 designation | 18 Dec 2025 | 41 | ~598 |
| 20th package | Apr 2026 | 46 | ~632 |
Beyond listings, the 19th package banned reinsuring shadow-fleet vessels, targeted false-flag registries, and named Lukoil enabler Litasco Middle East DMCC — alongside a full ban on Russian LNG imports. The strategic logic is attrition: each listing strips a vessel of port access, insurance renewal, and resale value, raising the cost of the next ton of sanctioned crude. For how organizations operationalize these lists, see our sanctions compliance service.
US and UK measures
OFAC and the UK's OFSI run parallel designation tracks that overlap heavily with the EU list but are not identical. In January 2025 OFAC sanctioned 183 vessels in a single action — including 69 Sovcomflot ships — a move Lloyd's List assessed as bringing roughly 35% of the dark fleet under sanction. The UK has cumulatively listed 544+ shadow-fleet vessels, with a 101-ship package on 9 May 2025 described as its largest to date. US action is especially disruptive because of secondary-sanction reach and the centrality of dollar clearing. CRITICAL
| Authority | Instrument | Reported scale |
|---|---|---|
| EU (Council) | Vessel listings; port/service bans; reinsurance ban | ~632 vessels listed (Apr 2026) |
| OFAC (US Treasury) | SDN designations; secondary-sanction risk | 183 vessels in Jan 2025 alone (incl. 69 Sovcomflot) |
| UK OFSI | Shipping/vessel sanctions | 544+ shadow-fleet vessels listed |
| IMO | Guidance on AIS misuse, flag responsibility, dark STS | GISIS flagged 367 false-flagged tankers (Apr 2026) |
The Insurance and Classification Gap
Outside the International Group
The defining feature of the dark fleet is that it operates outside the International Group of P&I Clubs, which insure roughly 90% of legitimate world tonnage. KSE Institute found that only about 29% of tankers carrying Russian crude in 2024 held IG cover (versus above 90% for clean-origin cargo), and by August 2025 only ~21% of Russian crude moved under IG insurance. Among the thousands of tankers with no ties to the price-cap coalition, a known P&I provider could be identified for just ~6%. The core systemic risk: an aging, effectively uninsured tanker grounding in a chokepoint could trigger a cleanup no underwriter will fund. CRITICAL
| Dimension | Mainstream tanker | Dark-fleet tanker |
|---|---|---|
| P&I cover | International Group club | Unknown / unverified insurer |
| Classification | IACS-member society | Non-IACS or lapsed class |
| Pollution-claim capacity | Mutualized, audited | Doubtful at scale |
| Port-state confidence | High | Detained/refused on inspection |
Classification-society flight
Reputable classification societies belonging to IACS have withdrawn class from sanctioned tonnage, pushing those vessels toward smaller or unrecognized societies — or to sailing without valid class at all. A lapsed or non-IACS class certificate is, like the false flag, a high-confidence screening signal. HIGH CONFIDENCE
Age Profile and the Casualty Risk
An old fleet getting older
Dark-fleet acquisition has drawn disproportionately on tankers near or past the age at which mainstream owners scrap them. Gibson reports the shadow fleet averages about 18 years old, versus roughly 10 years for mainstream tonnage; KSE found ships without IG cover average 18.1 years against 14.4 for insured tankers. The age profile is stark: 93% of the dark fleet is 15 or older and 64% is 20 or older. KSE's enforcement tracking found ~78% of designated tankers still loading in Russia were over 15 years old. Age compounds the insurance gap — older hulls fail port-state inspection more often and are statistically more prone to casualties. HIGH CONFIDENCE
| Metric | Dark / shadow fleet | Mainstream tonnage |
|---|---|---|
| Average age (Gibson) | ~18 years | ~10 years |
| Average age, no IG cover (KSE) | 18.1 years | 14.4 years (IG-insured) |
| Share aged 15+ | 93% | ~51% of all tankers 25k dwt+ |
| Share aged 20+ | 64% | ~22% of all tankers 25k dwt+ |
| Factor | Effect on risk |
|---|---|
| Advanced hull age | Higher structural failure and detention rates |
| Deferred maintenance | Greater spill and breakdown probability |
| No credible insurer | No funded cleanup after a casualty |
| Dark STS in open water | Collision/spill exposure away from port oversight |
AIS Evasion: The Operational Signature
How dark tankers hide
The behavioral fingerprint of the dark fleet is deliberate disruption of the Automatic Identification System (AIS). Operators switch off transponders during sensitive legs, broadcast false positions ("spoofing"), and conduct ship-to-ship transfers in poorly monitored waters to obscure cargo origin. Windward recorded more than 24,000 vessels affected by GPS jamming across Q1–Q3 2025, with AIS position "jumps" averaging some 6,300 km, and found 91% of sanctions-related dark activity tied to Russia- and Iran-aligned fleets. False-flagging surged from 223 to more than 370 vessels over the same period. Reported
| Technique | What analysts look for |
|---|---|
| AIS "going dark" (gaps) | Transponder silence over sanctioned trade lanes |
| AIS spoofing | Reported position inconsistent with satellite/SAR imagery |
| Identity laundering | IMO/name swaps; vessels broadcasting a clone's identity |
| Dark STS transfers | Loitering pairs of vessels off known transfer zones |
Cross-referencing AIS gaps with satellite imagery and draught changes is the workhorse of dark-fleet OSINT. Our standing method is documented in AIS gap analysis, and the named-vessel casework that grounds these patterns is in our analysis of the Russia shadow-fleet tanker cohort.
| Indicator | Confidence weight |
|---|---|
| Flag denied by the named registry | Very high |
| Non-IACS / lapsed classification | Very high |
| No International Group P&I cover | High |
| Repeated AIS gaps on sanctioned routes | High |
| Opaque/shell ownership, recent re-flag | Medium-high |
| Age well above world tanker average | Medium |
Outlook for 2026
Three vectors define the year ahead. First, attrition by listing: as EU/US/UK lists grow past 600 vessels each, listed tankers idle (KSE found designated ships clustering at Nakhodka, Murmansk and the Suez Canal), lose resale value, or are scrapped, raising effective freight costs for sanctioned barrels. Second, adaptation: KSE found 122 sanctioned tankers had already changed flag, name, or manager after designation, and the number of designated ships still loading in Russia rose from 44 in January 2025 to 143 by November — an arms race rather than a knockout. Third, environmental exposure: an aging, uninsured fleet concentrated in chokepoints keeps casualty risk elevated regardless of designation pace. The net trajectory is a fleet under genuine pressure but not collapse — older, more opaque, and more expensive to run.
| Vector | Direction | Implication |
|---|---|---|
| Designation pace | Rising | More idle/scrapped tonnage; higher sanctioned-freight cost |
| Evasion sophistication | Rising | Harder screening; premium on imagery + AIS fusion |
| Casualty/spill risk | Elevated | Uninsured incident in a strait remains the tail risk |
| Cargo-share of sanctioned oil | Persistently high | Dark tonnage still moves the majority of the flows |
Frequently Asked Questions
How many ships are in the dark fleet in 2026?
There is no definitive census. S&P Global counts roughly 940–980 core tankers (~17–18.5% of the world fleet); BRS put it near 1,140; Lloyd's List Intelligence counts ~1,423 tankers in sanctioned trading, of which ~921 are actively sanctioned; Windward counts more than 1,900 once gray tonnage is included. The EU's own designated-vessel list passed 600 in late 2025 and reached ~632 by April 2026.
What is the difference between the dark fleet, shadow fleet, and parallel fleet?
The terms are used interchangeably for tankers operating outside mainstream Western insurance, finance, and oversight to move sanctioned oil. "Dark" emphasizes AIS evasion; "shadow/parallel" emphasizes operating alongside the legitimate fleet. See our shadow fleet brief for the conceptual overview.
Which flags does the dark fleet use?
It concentrates under open registries with light enforcement. As large registries like Panama and Liberia de-flag sanctioned ships, tonnage migrates to smaller registries (e.g. Gabon, Cook Islands, Palau, Comoros) or sails under flags the named state disowns. Details in our flag-of-convenience methodology.
Why is the insurance gap the most dangerous feature?
Dark-fleet tankers operate outside the International Group of P&I Clubs, which cover ~90% of world tonnage. KSE found only ~21% of Russian crude moved under IG insurance by August 2025, and a known P&I provider could be identified for just ~6% of non-coalition tankers. Combined with an ~18-year average age, an uninsured casualty in a chokepoint is the fleet's defining systemic risk.
Are the sanctions actually working?
Partially. Vessel listings idle ships and raise sanctioned-freight costs, and KSE/CREA document revenue pressure. But the fleet adapts: KSE found 122 sanctioned tankers changed flag, name or manager after designation, and designated ships still loading in Russia rose from 44 (Jan 2025) to 143 (Nov 2025). The effect is attrition and cost-inflation, not elimination.
How do analysts identify a dark-fleet vessel?
By fusing signals: a flag the registry denies, non-IACS or lapsed class, no verifiable P&I cover, repeated AIS gaps on sanctioned routes, opaque ownership, and elevated age. No single flag is conclusive; the composite scorecard (Table 11) drives confidence.
Sources
- Council of the EU — 19th package of sanctions against Russia (117 vessels; total 557; LNG ban; reinsurance ban), 23 Oct 2025. consilium.europa.eu
- Council of the EU — Council sanctions 41 vessels of the Russian shadow fleet (total nears 600), 18 Dec 2025. consilium.europa.eu
- KSE Institute — "70% of Russian seaborne oil shipped by shadow fleet" analysis (via Kyiv Independent). kyivindependent.com
- KSE Institute — Russian Oil Tracker / shadow-fleet dependence and enforcement (idle tankers, re-flagging, IG-insurance share). sanctions.kse.ua
- KSE Institute — Oil Spill Insurance and the Shadow Fleet (IG-coverage gap; age 18.1 vs 14.4 yrs), Feb 2025. kse.ua (PDF)
- CREA — November 2025 monthly analysis of Russian fossil-fuel exports (65% sanctioned-shadow share of crude). energyandcleanair.org
- S&P Global — FACTBOX: Shadow fleet expands to maintain sanctioned oil flows (~940 ships, ~17%). spglobal.com
- U.S. Department of the Treasury / OFAC — Treasury intensifies sanctions targeting Russia's oil production and exports (183 vessels; 69 Sovcomflot), Jan 2025. home.treasury.gov
- Lloyd's List — Dark fleet safe haven Gabon flags Sovcomflot tankers; flag-hopping analysis. lloydslist.com
- Windward — 2025 maritime stress-test report (GPS jamming, false-flagging, >1,900 dark-fleet tankers). windward.ai
- Gibson / SAFETY4SEA — 93% of the shadow fleet is over 15 years old (age profile). safety4sea.com
- S&P Global — EU sanctions 41 more Russian shadow-fleet tankers (cumulative total nears 600), Dec 2025. spglobal.com