The U.S. Iran peace agreement reopening the Strait of Hormuz has quickly fed through to energy markets, with falling crude prices pressuring Marathon Petroleum (MPC) stock as investors reassess refining margins and input cost assumptions.

Even before the Strait of Hormuz agreement, Marathon Petroleum stock had strong momentum, with a year to date share price return of 47.09% and a 1 year total shareholder return of 47.93%. However, recent weakness, including a 7.65% 30 day share price decline, suggests that shorter term momentum is fading as investors reassess crude price and margin expectations.

If lower crude prices have you rethinking refinery exposure, it can be useful to balance the view with other parts of the energy chain such as 34 power grid technology and infrastructure stocks

So with Marathon Petroleum stock up strongly over the past year yet recently under pressure, and trading at what some models suggest is a roughly 38% intrinsic discount, should you see current levels as a fresh entry point or assume the market is already pricing in future growth?

Most Popular Narrative: 8.4% Undervalued

At a last close of $242.91 versus a narrative fair value of $265.06, the most followed view sees Marathon Petroleum stock trading at a discount while still grounding that view in conservative assumptions about revenues and margins.

Disciplined capital allocation through continued share buybacks, increasing MPLX distributions, and maintenance of an investment-grade balance sheet are set to drive higher earnings per share and sustained shareholder returns, aligning with positive long-term company trends.

Want to understand why a flat revenue outlook still supports a higher fair value for Marathon Petroleum? The narrative leans heavily on margin expansion, shrinking share count, and a lower future earnings multiple than many investors might expect.

Result: Fair Value of $265.06 (UNDERVALUED)

However, this narrative can quickly be tested if long term demand for refined fuels weakens faster than expected or if tighter environmental rules pressure refinery economics.

Another View on Marathon Petroleum’s Valuation

The narrative fair value suggests Marathon Petroleum stock is undervalued, but the current P/E of 15.3x paints a tighter picture. It sits above the US Oil and Gas industry at 13x and above peer average of 14.6x, yet below a 20x fair ratio. Is that a margin of safety or a warning sign if sentiment cools?

For a closer look at how earnings, cash flows, and valuation all line up over time, take a moment to review the See what the numbers say about this price — find out in our valuation breakdown.

Next Steps

If this mix of optimism and concern around Marathon Petroleum leaves you undecided, consider acting while sentiment is shifting by weighing both sides through the 3 key rewards and 1 important warning sign.

Looking for more investment ideas beyond Marathon Petroleum?

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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.