The U.S. Strategic Petroleum Reserve is at its lowest level since 1983 and a large slice of that supply is currently off limits due to outages and aging infrastructure. That matters for energy stocks that depend on the SPR as a safety valve when oil markets get stressed. If future supply shocks are harder to cushion, refiners and producers tied closely to U.S. crude flows could feel it in their margins and share prices. This article examines 3 stocks that appear especially exposed to this SPR story and explains why their risk profile may now be higher.

Phillips 66 (PSX)

Overview: Phillips 66 is a large downstream energy company that turns crude oil and other feedstocks into fuels, petrochemicals, plastics and renewable products, then moves and sells them through its global refining, midstream, chemicals and marketing operations. Its brands include Phillips 66, Conoco, 76, JET and Kendall, with a history that traces back to 1875 and a headquarters in Houston.

Operations: Phillips 66 generates most of its revenue from Marketing and Specialties at about US$86.5b and Refining at about US$81.6b, with additional contributions from Midstream at about US$21.2b and Renewable Fuels at about US$6.2b. Revenue is largely tied to customers in the United States at about US$105.9b, followed by the United Kingdom, Germany and other foreign markets.

Market Cap: US$82.9b

Phillips 66 may appeal to investors who focus on current cash flow rather than speculative growth stories, but the risks around crude supply are significant. The company has benefited from higher refining margins and midstream expansion, while analysts expect revenue to decline about 1.5% a year and earnings growth to slow to 5.8% a year. Thinner SPR protection is a potential concern because reduced emergency crude support can amplify price spikes and put pressure on refiners that rely on stable, affordable feedstock. Combined with a dividend that is not well covered by free cash flow and debt that is not well covered by operating cash flow, the company appears to score well on recent earnings yet may be more financially vulnerable than current optimism suggests.

Refining margins and cash returns at Phillips 66 can mask how exposed the company might be if SPR support stays thin and crude shocks bite. Before assuming the story is safer than it looks, review the 3 key rewards and 2 important warning signs (1 is major!)

Marathon Petroleum (MPC)

Overview: Marathon Petroleum is a large U.S. refiner that turns crude oil and other feedstocks into gasoline, diesel, jet fuel, asphalt, petrochemicals and propane, and also runs a sizeable midstream and renewable diesel business that moves, stores and markets fuels through pipelines, terminals, barges and branded outlets like Marathon and ARCO.

Operations: Marathon Petroleum generates most of its revenue from Refining & Marketing at about US$127.2b, with additional contributions from Midstream at about US$11.4b and Renewable Diesel at about US$2.8b, and its revenue is currently reported entirely from customers in the United States at about US$136.2b.

Market Cap: US$90.3b

Marathon Petroleum is closely tied to the SPR story. As a major Gulf Coast refiner that has previously leaned on advantaged SPR crude near key plants like Garyville, a thinner and less reliable reserve raises the risk of feedstock shortages, sharper crude price swings and tighter margins when supply shocks hit. Recent earnings and buybacks paint a strong picture. However, this is based on heavy fossil-fuel exposure, high leverage and an outlook where both revenue and earnings are expected to drift lower over the next few years. If the SPR cannot cushion future disruptions as effectively as in the past, the gap between today’s optimism and the company’s real risk profile could be wider than it appears.

Marathon Petroleum’s buybacks and recent earnings might be masking how exposed the story is to a thinner SPR and high leverage. Before assuming the momentum holds, walk through the 2 key rewards and 2 important warning signs (1 is major!).

Valero Energy (VLO)

Overview: Valero Energy is a large refiner that turns crude oil and other feedstocks into gasoline, diesel, jet fuel, asphalt and petrochemicals. It also operates renewable diesel and ethanol plants that sell low carbon fuels and co products under brands such as Valero, Beacon, Diamond Shamrock and Texaco across the Americas and Europe.

Operations: Valero Energy generates most of its revenue from Refining at about US$118.2b, with smaller contributions from Renewable Diesel at about US$5.1b and Ethanol at about US$4.9b. These are partially offset by about US$3.4b of Corporate and Other costs.

Market Cap: US$89.8b

Valero Energy currently operates in what some investors may view as a favorable environment for refining margins, yet it may appear more exposed when the thin U.S. Strategic Petroleum Reserve is considered. The company has reported very strong recent earnings, visible analyst interest and a steady dividend, while a Simply Wall St cash flow estimate indicates potential upside to intrinsic value. At the same time, the stock trades on a higher P/E than many oil and gas peers, analysts expect revenue and earnings to decline over the next few years, and the business faces meaningful exposure to regulatory change and high operating costs, particularly in renewables and West Coast refining. If SPR support does not cushion future supply shocks, today’s strong cash returns could be more difficult to maintain than recent headlines suggest.

Valero Energy’s strong recent earnings, higher P/E and exposure to a thinner SPR could be masking where the real pressure sits. Before assuming the cash story holds, walk through the 3 key rewards and 2 important warning signs (1 is major!)

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.