Market note originally published in May 2025. Figures describe conditions at that time and are not current market data.
In early May 2025 the Brent/WTI spread narrowed as strong US crude exports and low Cushing inventories eroded part of the premium that Atlantic Basin Brent grades usually hold over WTI. For procurement desks buying on both sides of the Atlantic, a narrower spread tightens arbitrage windows and is a prompt to revisit origin selection ahead of the next nomination cycle.
STRUCTURAL DRIVERS OF SPREAD COMPRESSION
Two forces typically narrow the spread. First, high US export volumes pull Gulf Coast barrels into the international market and support WTI relative to Brent. Second, low inventories at Cushing, Oklahoma — the delivery point for the NYMEX WTI contract — tighten the domestic prompt market. In spring 2025 Cushing stocks were low by historical standards: EIA weekly data put them at about 23.9 million barrels in the week ending 9 May 2025.
On the Brent side, seasonal North Sea field maintenance can temporarily reduce loadings and support Brent, partially offsetting the effect. The net result in spring 2025 was a WTI that traded closer to Brent than its longer-run average, despite WTI being the lighter grade.
CUSHING DYNAMICS AND PIPELINE INFRASTRUCTURE
| Indicator | What to watch | Effect on Brent/WTI spread |
|---|---|---|
| Cushing working stocks (EIA weekly) | Level vs. 5-year seasonal range | Low stocks support WTI and narrow the spread |
| US crude exports (EIA) | Weekly and monthly export volumes | Higher exports tend to narrow the spread |
| Permian pipeline egress to the Gulf Coast | Utilisation of export pipelines | Constraints widen the spread; spare capacity narrows it |
| Transatlantic tanker rates | USGC–Europe freight | Higher freight widens the spread needed for arbitrage |
ATLANTIC BASIN ARBITRAGE WINDOW
The transatlantic arbitrage works when the Brent/WTI spread covers freight from the US Gulf Coast to Europe plus quality adjustments. When the spread narrows, fewer cargoes clear that hurdle unless freight rates fall too. Buyers comparing WTI-linked and Brent-linked offers should therefore look at the delivered, freight-adjusted price rather than the headline spread.
Refinery configuration also matters. European refiners that re-optimised around medium sour replacement grades after the 2022 supply reshuffle may need crude unit adjustments to run more light sweet WTI, which can shift product yields.
PROCUREMENT IMPLICATIONS
When the spread is unusually narrow, buyers generally keep Brent-basis contracts for European supply and evaluate WTI-linked cargoes only where refinery configuration and delivered economics justify it. A narrow spread driven by low Cushing stocks can reverse as inventories rebuild, so buyers with open positions may consider hedging the differential rather than assuming the narrow spread persists. Any hedge should be set up with your own risk and trading advisers.