VLO vs MPC — which stock performed better?

Valero Energy Corporation (VLO) versus Marathon Petroleum Corporation (MPC), Energy, on 2026-09-22.

Result

Valero Energy Corporation (VLO) performed better on 2026-09-22. VLO moved 2.480%, MPC moved 0.710%.

Why these two companies

Valero and Marathon Petroleum are the two purest-play U.S. refiners riding a historic diesel crack-spread spike caused by the Strait of Hormuz disruption and drone strikes on Russian refining capacity, and both have logged six straight weeks of gains into September 18, 2026. A Yahoo Finance piece published September 17, 2026 asked whether it is now too late to buy either name, making this the clearest head-to-head refiner debate on the tape heading into the next session.

The research

Valero Energy and Marathon Petroleum both buy crude oil and turn it into gasoline, diesel, and jet fuel at large refineries across the United States — they don't drill for oil themselves, they process it. Both stocks have surged dramatically in 2026 because the fuel they produce, especially diesel, has become unusually scarce and profitable after shipping disruptions near the Middle East and strikes on Russian refineries cut into global fuel supply.

One reason to consider Valero is that it also has a renewable diesel and ethanol business, which gives it an extra source of profit beyond traditional refining, and Wall Street has been raising its price expectations sharply as this fuel squeeze has played out. One reason to consider Marathon Petroleum is that it runs the largest refining network in the country by volume and also owns a large piece of a pipeline company, giving it a steady stream of fee-based income on top of its refining profits.

Something to keep in mind with both companies is that this kind of profit boom has historically not lasted forever — when the shipping and supply disruptions that caused the fuel shortage eventually ease, the extra profit margin refiners are earning right now tends to shrink quickly, and the stocks can give back gains just as fast as they came. Both companies will report their next quarterly results within about six weeks, which will show whether the boom is continuing or starting to fade.