Summary
AXS Marine shipping analytics report on Strait of Hormuz vessel traffic in April 2026. Tracks four cargo sub-segments (dry bulk/MPP, tanker, gas carriers, liner) for vessels above 10,000 dwt. Shows a fragile, partial recovery in mid-April that collapsed after the TOUSKA seizure on April 19, ending the month at roughly 2% of pre-war activity. Includes the most granular publicly available AIS dark-rate data.
Key Points
- April crossings (AXS Marine 4-segment scope): 301, up from 238 in March (+26.5% MoM); down 90.9% year-on-year vs. April 2025’s 3,297
- Note on methodology: Kpler data (widely cited at 191 crossings for April) uses a different vessel universe. AXS Marine’s 301 is not contradictory — it covers only the 4 segments above 10,000 dwt, where some vessel types show higher relative activity
- Daily pattern: Fewer than 5 crossings/day early April; rose to ~10/day before ceasefire announcement; peaked at 28 on April 18 (all segments participating); collapsed to avg 6/day after TOUSKA seizure on April 19
- Fleet congestion: 1,000+ commercial vessels accumulated west of Hormuz at peak; mid-April: 959 of 1,441 tracked vessels inside the Gulf; ~900 by month-end
- AIS dark rate: 307 of 949 tracked vessels west of Hormuz operating under blackout conditions = 32% dark rate (pre-conflict baseline: ~17%); described as “more than double the pre-conflict baseline”
- Oil backlog: ~15–16 million metric tons of crude stored aboard vessels in the Gulf = 108–117 million barrels at sea
- YoY declines by segment: Dry Bulk/MPP -83.9%; Tanker -93.2%; Gas carriers -87.9%; Liner -94.7%
Newsletter Angles
- The AIS dark-rate data (32% vs. 17% baseline) is a citable, precise confirmation of the risk environment that official crossing counts obscure. 307 of 949 vessels go invisible — visible only by satellite — because the commercial risk of being identified outweighs the navigational cost of flying dark. That’s a primary-source operational signal.
- The TOUSKA seizure (April 19) as the event that ended the mid-April partial recovery is a clean causal story: one seizure, a market-level panic, crossings drop from 28 to 6/day. That’s an event-driven piece.
- The oil-at-sea backlog (108–117 million barrels) is a physical inventory story — oil that can’t move until political resolution is durable enough for insurance underwriters.
Entities Mentioned
- Strait of Hormuz — primary subject
- Iran — closure context
Concepts Mentioned
- War-Driven Inflation — oil backlog and suppressed throughput are the transmission mechanism
- Chokepoint Control — the collapse-and-fragile-recovery pattern illustrates how control functions even without a formal blockade
- Infrastructure Warfare — AIS suppression as both a defensive tactic and a data signal
Quotes
“307 operating under blackout conditions” out of 949 tracked vessels west of Hormuz mid-April, representing “around 32 percent” regional dark rate versus “approximately 17 percent” pre-conflict baseline
“Across four tracked segments, confirmed April crossings rose to 301, up from 238 in March, representing a 26.5% month-on-month increase.”
“Compared with April 2025, when 3,297 crossings were recorded across the same broad group, activity remained down by 90.9%.”
“28 confirmed crossings on 18 April alone, with all major vessel segments participating.”
Notes
Methodology note: AXS Marine’s 301 and Kpler’s 191 measure different vessel universes. AXS tracks four sub-segments above 10,000 dwt; Kpler appears to use a broader scope. Both are legitimate, non-contradictory data points for different analytic purposes. Do not mix in the same sentence without noting the difference. AXS Marine’s AIS dark-rate data is the most precisely cited figure available publicly for this metric.