Bunker fuel buyers at the Amsterdam-Rotterdam-Antterdam hub still need 5-7 days to lock in prompt deliveries, even as independently held fuel oil stocks climb 15% above August's monthly average, according to Insights Global data reported by ENGINE.

Fuel oil inventories rose by approximately 706,000 barrels to 5.33 million barrels. Gasoil — covering diesel and heating oil — added around 255,000 barrels to reach 12.33 million barrels, a 2% month-on-month gain.

The refilling matters more because of how low the base was. Fuel oil stocks touched their weakest level in more than a decade back in May and remain 18% below February, before conflict in the Middle East reshuffled crude and product flows. A 47% climb from that May trough signals slow healing rather than a return to seasonal norms.

The rebound has not loosened the bunker market. One trader told ENGINE that prompt supply remains tight across every fuel grade, with the 5-7 day lead window holding. For container lines, tanker operators and tramp owners calling ARA, that buffer erodes just-in-time bunkering and forces longer-term voyage planning.

What do the cargo flows look like?

Vortexa tracking shows ARA fuel oil imports averaging 276,000 barrels per day in September so far — a sharp drop from August's 342,000 b/d monthly average. Mexico accounted for 23% of arrivals, Colombia 19% and Benin 14%, with West African volumes helping plug the gap left by thinner Middle East supply.

At the same time, exports surged. ARA fuel oil shipments outbound averaged 225,000 b/d in September so far, up from 144,000 b/d in August. Singapore drew 20% of those cargoes, the UK 12% and Russia 11% — a flow mix that shows the hub actively re-exporting to Atlantic basin consumers and to Asian traders covering Singapore's marine fuel complex.

Gasoil imports slowed to roughly 141,000 b/d, down from August's 155,000 b/d average. The United States kept its anchor position with 30% of arrivals, followed by the UK on 18% and Sweden on 12%.

The pattern — imports easing, exports accelerating — explains why the headline stock climb has not translated into looser bunker availability. Inventories are filling partly because ARA ships product out as fast as it can source it, leaving little slack for prompt marine demand.

What does it mean for shippers, carriers and forwarders?

For liner operators and tanker owners, the operational takeaway is unchanged from August: bunker procurement at ARA still requires a 5-7 day forward booking, regardless of grade. That timing acts as a hidden cost for owners running tight schedules between Rotterdam and the Baltic, and it pushes some operators to bunker at alternative Northwest European hubs such as Hamburg or at Mediterranean ports, even when ARA pricing would otherwise be attractive.

Forwarders arranging ship calls into Rotterdam face knock-on effects. Late bunker deliveries delay berthing windows, and those delays cascade into roll-on schedules for connecting feeder services and into hinterland rail slots at Maasvlakte.

How exposed is ARA to the residual February shortfall?

ARA fuel oil stocks remain 18% under their February baseline, with autumn refiners' maintenance historically draining inventories rather than building them. That seasonal pattern typically pushes Northwest European product tightness deeper into late October and November, when gasoil demand for heating competes directly with marine gasoil call-offs.

Unless crude flows from the Middle East normalise or Atlantic basin refiners lift runs decisively before the maintenance window closes, the ARA bunker market is set to keep trading prompt cargo at a premium well into the fourth quarter.