Record Refining Margins Persist Amid Global Diesel Shortage
US refiners have posted over 100% gains in the past year as diesel cracks hit records, driven by constrained supply and historic inventory lows rather than crude price movements alone.
The four major American refiners have each gained more than 100% in value over the trailing twelve months, significantly outperforming the S&P 500. This surge coincides with diesel cracks reaching all-time highs, a trend that persists despite volatility in crude oil prices. The market dynamics have shifted away from marginal refinery capacity setting prices and toward inventory depletion and customer willingness to pay, indicating a structural supply constraint rather than a transient geopolitical spike.
Refineries are operating at utilization rates exceeding 97%, yet they cannot meet demand without drawing down storage. Global diesel supply has shrunk by an estimated 1.5 million barrels per day, representing roughly 5% of world demand. Barrels are effectively removed from the market due to logistical bottlenecks in the Strait of Hormuz, offline Russian production, and export bans in China. This supply shock has decoupled diesel prices from crude oil trends, allowing margins to widen even as crude prices fluctuate.
Supply Constraints Decouple Diesel From Crude
Historically, diesel prices correlated strongly with crude oil, with a $1 increase in crude leading to a $0.65 rise in diesel. Currently, that correlation has weakened significantly, with the R-squared value dropping from 0.70 to 0.39. When the Strait of Hormuz failed to reopen in early July, diesel prices rebounded toward $170 per barrel despite lower crude costs. This divergence confirms that the primary constraint is product availability, not feedstock cost. Refineries can secure crude, but the resulting product volume falls short of global demand.
The market is currently in backwardation, with New York Harbor Heating Oil futures for 2027 trading at a discount of over $1 per gallon compared to spot prices. For refiners and traders, this structure incentivizes immediate sales of existing inventory, as the current price is higher than the forward price. This dynamic accelerates the drawdown of stocks, keeping spot prices elevated and supporting the high crack spreads that have characterized the recent trading session.
Historical Data Suggests Prolonged High Margins
Analysis of inventory drains since the start of the Russia-Ukraine war in 2022 provides a framework for predicting duration. Historical patterns indicate that replenishing global tank inventory takes significantly longer than draining it. If the current trajectory mirrors the 2022 cycle, product cracks could remain elevated for an extended period as the market slowly rebuilds storage levels. This sustained pressure on supply supports the thesis that current refining margins are not merely a temporary spike but a structural feature of the current market environment.
The persistence of these conditions validates the performance of refining equities, which have outperformed broader indices. As long as inventories remain at historic lows and global supply remains constrained by geopolitical and regulatory factors, the economic rationale for high margins remains intact. The market is pricing in a prolonged period of tight supply, with the speed of inventory restoration being the key variable determining the longevity of these record-high cracks.
Market Structure Reflects Persistent Shortage
The decoupling of diesel and crude prices signals a fundamental shift in how the market values refining capacity. With utilization near maximum levels, the marginal cost of production is no longer the binding constraint; instead, the scarcity of finished product drives pricing. This regime change favors companies with significant refining assets, as they capture the spread between relatively stable crude costs and soaring product prices. The current environment reflects a global deficit that cannot be quickly resolved by increasing refinery throughput alone.
Traders and investors are adjusting their models to account for this new baseline, where backwardation and low inventories are the norm rather than the exception. The data suggests that any resolution of the supply constraints will be gradual, requiring time to rebuild global stocks. Until then, the high margin environment is likely to persist, underpinning the strong financial performance of major US refiners and shaping the broader energy landscape.
