Refiner Stocks Have Doubled in 2026 as the World Runs Short of Diesel

Diesel crossed $6 a gallon in the United States for the first time in mid-September, and it kept climbing, reaching roughly $6.31 to $6.49 by September 20 and 21 according to AAA and GasBuddy. That price moves everything that rides on a truck, from groceries to hospital supplies. It has also made American oil refiners some of the best-performing large stocks of the year.

On September 14, OilPrice.com reported that Phillips 66, Valero and Marathon Petroleum had each more than doubled in 2026. ExxonMobil and Chevron, by comparison, were up about 40%. Traders Union, writing the same day, described the refiners' rally as margin-driven, with diesel and jet fuel tightness lifting the cash-flow outlook.

The reason is the gap between what refiners pay for crude oil and what they get for gasoline, diesel and jet fuel. Traders call that gap the crack spread. OilPrice.com described product margins at record highs.

The cause is not mainly a lack of crude. It is a lack of refining. OilPrice.com, citing the International Energy Agency, reported global refinery throughput of 81.4 million barrels a day in August. That was 4.2 million barrels a day below a year earlier.

More than 7 million barrels a day of refined product flows were offline in the Middle East and Russia, according to the same report. The wars involving Iran and Ukraine are the main reasons. Ukraine has targeted Russian refineries for months. Lost refining capacity cannot be replaced quickly.

Inventories show the strain. U.S. distillate stocks in August were on track for their lowest end-of-month level since April 2005, according to RBN Energy as cited by OilPrice.com. Traders Union put distillate stocks about 14% below the five-year average. Phillips 66 chief executive Mark Lashier called it more of a supply shock than a demand shock.

The desk's summary blamed refinery outages, maintenance turnarounds and higher freight costs. Those play a part. The reporting we found puts war damage to foreign refining capacity at the center, which the desk did not mention.

The desk also said the margin had widened without a big move in crude. That is only partly true. Crude was also rising as Middle East tensions escalated. Product prices simply rose faster, which is why the cracks reached records. We could not confirm a specific weekly crude figure, so we do not give one.

Fuel shocks plausibly reach health care quickly. Hospitals run on deliveries, generators and ambulances. This is our own reasoning, not something the sources measured, and it is the weakest part of the argument here. We have no data on how long diesel costs take to show up in the price of supplies, food and medications, or on which patients are hit hardest. Patients on fixed incomes and rural patients who drive long distances to see specialists are the likeliest to feel it.

For anyone holding energy stocks, the lesson is about what a company actually earns. A refiner's profit rides on the spread, not on the oil price. That makes it a different bet from owning a producer, with different risks.

• Margins swing fast. Morningstar DBRS has called the current margins a likely temporary tailwind that could weaken when tensions ease. Valero's chief operating officer said cracks had pulled back from their third-quarter peaks but should recover. Spreads can fall as quickly as they rose. • Analysts are cautious. OilPrice.com reported that average 12-month price targets for Valero, Marathon and Phillips 66 trailed their share prices.

• Peace or repairs. Any restoration of Russian or Middle Eastern refining would ease the shortage. Lashier said he expects normalization to take longer than it did after 2022. • Demand. Prices this high eventually reduce fuel use, especially in freight. • Policy. Talk of a U.S. diesel export ban surfaced in October and widened the WTI– Brent discount to about $12 a barrel. Wood Mackenzie says a ban could cut U.S. crude runs by more than 2 million barrels a day, a new risk for refiners. Not financial advice. This article reports facts and context only.

• Weekly U.S. distillate inventory data against the five-year average. • Any repair of Russian refineries or easing in the Middle East. • Further refiner earnings calls. Third-quarter results are now arriving: Valero reported on October 22 a record quarterly profit of about $6.8 billion, with a refining margin of $39.24 a barrel against $13.14 a year earlier.

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