Sifting through countless of stocks in the Oil, Gas & Consumable Fuels industry can be tedious, and sometimes two stocks are just too similar to judge which is the better investment. If you’re on the fence about investing in Marathon Petroleum Corporation or Phillips 66 because you’re not sure how they measure up, it’s important to compare them on a few factors before making your decision.

Read on to learn how Marathon Petroleum Corporation and Phillips 66 compare based on key financial metrics to determine which better meets your investment needs.

About Marathon Petroleum Corporation and Phillips 66

Marathon Petroleum Corporation, together with its subsidiaries, operates as an integrated downstream energy company in the United States. The company operates through three segments: Refining & Marketing; Midstream; and Renewable Diesel. The Refining & Marketing segment refines crude oil and other feedstocks at its refineries in the Gulf Coast, Mid-Continent, and West Coast regions of the United States; and purchases refined products and ethanol for resale and distributes refined products through transportation, storage, distribution, and marketing services. Its refined products include transportation fuels, such as reformulated gasolines and blend-grade gasolines; heavy fuel oil; and asphalt. This segment also manufactures propane and petrochemicals. The company sells refined products to wholesale marketing customers in the United States and internationally, buyers on the spot market, and independent entrepreneurs who operate primarily Marathon branded outlets, as well as through long-term fuel supply contracts to direct dealer locations primarily under the ARCO brand. The Midstream segment gathers, transports, stores, distributes, and markets crude oil and refined products, including renewable diesel and other hydrocarbon-based products through refining logistics assets, pipelines, terminals, towboats, and barges; gathers, processes, and transports natural gas; and transports, fractionates, stores, and markets natural gas liquids. The Renewable Diesel segment processes renewable feedstocks into renewable diesel, markets, and distributes renewable diesel through its Midstream segment and third parties. It sells renewable diesel to wholesale marketing customers, buyers on the spot market, and through long-term supply contracts to direct dealers under the ARCO brand. Marathon Petroleum Corporation was founded in 1887 and is headquartered in Findlay, Ohio.

Phillips 66 operates as an integrated downstream energy provider in the United States, the United Kingdom, Germany, and internationally. It operates through five segments: Midstream, Chemicals, Refining, Marketing and Specialties (M&S), and Renewable Fuels. The Midstream segment provides crude oil and refined petroleum product transportation, terminaling, and storage services, as well as natural gas and natural gas liquids (NGL) gathering, processing, transportation, fractionation, storage and marketing services. It also exports liquefied petroleum gas. The Chemicals segment produces and markets ethylene and other olefin products; aromatics and styrenics products, such as benzene, cyclohexane, styrene, and polystyrene; various specialty chemical products, including organosulfur chemicals, solvents, catalysts, and chemicals used in drilling and mining; and petrochemicals and plastics. The Refining segment refines crude oil and other feedstocks into petroleum products, such as gasolines and distillates, including aviation fuels. The M&S segment purchases for resale and markets refined products, including gasolines, distillates, and aviation fuels. This segment also manufactures and markets specialty products, such as automotive, commercial, industrial, and specialty lubricants, as well as base oils. The Renewable Fuels segment processes renewable feedstocks into renewable products, as well as supplies sustainable aviation fuel. This segment also procures renewable feedstocks, manages certain regulatory credits, and markets renewable diesel, renewable jet fuel, and other renewable fuels. The company markets its products under the Phillips 66, Conoco and 76, JET, Kendall, Red Line, and other private label brands. Phillips 66 was founded in 1875 and is headquartered in Houston, Texas.

Latest Oil, Gas & Consumable Fuels and Marathon Petroleum Corporation, Phillips 66 Stock News

As of June 5, 2026, Marathon Petroleum Corporation had a $76.5 billion market capitalization, compared to the Oil, Gas & Consumable Fuels median of $2.3 million. Marathon Petroleum Corporation’s stock is up 61.1% in 2026, up 5.3% in the previous five trading days and up 66.94% in the past year.

Currently, Marathon Petroleum Corporation’s price-earnings ratio is 17.1. Marathon Petroleum Corporation’s trailing 12-month revenue is $135.9 billion with a 3.4% net profit margin. Year-over-year quarterly sales growth most recently was 8.8%. Analysts expect adjusted earnings to reach $29.089 per share for the current fiscal year. Marathon Petroleum Corporation currently has a 1.5% dividend yield.

As of June 5, 2026, Phillips 66 had a $73.4 billion market cap, putting it in the 95th percentile of all stocks. Phillips 66’s stock is up 41.9% in 2026, up 4.1% in the previous five trading days and up 62.77% in the past year.

Currently, Phillips 66’s price-earnings ratio is 18.0. Phillips 66’s trailing 12-month revenue is $134.5 billion with a 3.1% net profit margin. Year-over-year quarterly sales growth most recently was 6.9%. Analysts expect adjusted earnings to reach $17.581 per share for the current fiscal year. Phillips 66 currently has a 2.8% dividend yield.

How We Compare Marathon Petroleum Corporation and Phillips 66 Stock Grades

Stock evaluation requires access to huge amounts of data and the knowledge and time to sift through it all, make sense of financial ratios, read income statements and analyze recent stock movements. AAII created A+ Investor, a robust data suite that condenses data research in an actionable and customizable way suitable for investors of all knowledge levels, to help investors streamline and work through such data.

AAII’s proprietary stock grades come with A+ Investor. These offer intuitive A‐F grades for each of five key investing factors: value, growth, momentum, earnings estimate revisions and quality. Here, we’ll take a closer look at Marathon Petroleum Corporation and Phillips 66’s stock grades to see how they measure up against one another.

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Marathon Petroleum Corporation and Phillips 66’s Quality Grades

Company	Ticker	Quality
Marathon Petroleum Corporation	MPC	B
Phillips 66	PSX	C

Like the Value Grade, AAII’s A+ Investor Quality Grade comes from the percentile rank of key metrics. Specifically, the Quality Score is the percentile rank of the average of the percentile ranks of return on assets (ROA), return on invested capital (ROIC), gross profit relative to assets, buyback yield, change in total liabilities to assets, accruals, Z double prime bankruptcy risk (Z) score and the F-Score.

The score is variable, meaning it can consider all eight measures or, should any of the eight measures not be valid, the remaining measures that are valid. To be assigned a Quality Score, stocks must have a valid (non-null) measure and corresponding ranking for at least four of the eight quality measures.

The Quality Score is used to assess the underlying “quality” of a particular stock. A higher-quality stock possesses traits associated with upside potential and reduced downside risk. Backtesting of the Quality Grade shows that stocks with higher grades, on average, outperformed stocks with lower grades over the period of 1998 through 2019.

Stocks receive better grades (higher scores) for having higher scores for the quality subcomponents and worse grades (lower scores) for lower scores for the subcomponents.

Marathon Petroleum Corporation has a Quality Score of 79, which is Strong. Phillips 66 has a Quality Score of 51, which is Average.

The Quality Grade Winner: Marathon Petroleum Corporation

As you can clearly see from the Quality Grade breakdown above, Marathon Petroleum Corporation has a better overall quality grade than Phillips 66. For investors who are looking for companies with higher quality than others in the same industry, Marathon Petroleum Corporation could be a good stock to add to their portfolios. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Marathon Petroleum Corporation and Phillips 66’s Momentum Grades

Company	Ticker	Momentum
Marathon Petroleum Corporation	MPC	B
Phillips 66	PSX	B

Momentum grades help to uncover stocks experiencing anomalously high rates of return; research finds that stocks with high relative levels of momentum tend to outperform, whereas those with low levels of momentum tend to continue underperforming. Momentum is based on the price change of a stock over a specified period relative to all other stocks.

Typically, AAII looks at the weighted relative strength over the trailing four quarters. The weighted four-quarter relative strength rank is the relative price change for each of the past four quarters. The most recent quarterly price change is given a weight of 40% and each of the three previous quarters are given a weighting of 20%.

Marathon Petroleum Corporation has a Momentum Score of 80, which is Strong. Phillips 66 has a Momentum Score of 76, which is Strong.

The Momentum Grade Winner: It’s a Tie!

Looking at the Momentum Grade breakdown above, both Marathon Petroleum Corporation and Phillips 66 have a grade of B. For those who focus solely on a company’s momentum, further research will need to be conducted into both companies to see if they fit your individual needs as an investor.

Marathon Petroleum Corporation and Phillips 66’s Estimate Revisions Grades

Company	Ticker	Earnings Estimate
Marathon Petroleum Corporation	MPC	A
Phillips 66	PSX	B

Earnings estimate revisions scores consider the magnitude of a company’s earnings surprise in its last two reported fiscal quarters. Often, positive surprises beget further positive surprises‐or at least continued sales growth (the exact opposite is generally true, too).

Estimate revisions offer an indication of what analysts are thinking about the short-term prospects of a firm. Estimate revisions are based on the statistical significance of a firm’s last two quarterly earnings surprises and the percentage change in its consensus estimate for the current fiscal year over the past month and past three months.

Marathon Petroleum Corporation has a Earnings Estimate Score of 92, which is Very Positive. Phillips 66 has a Earnings Estimate Score of 78, which is Positive.

The Earnings Estimate Revisions Grade Winner: Marathon Petroleum Corporation

As you can clearly see from the Earnings Estimate Revisions Grade breakdown above, Marathon Petroleum Corporation has a better Earnings Estimate Revisions Grade than Phillips 66. For those who are specifically looking for companies with better short-term prospects when compared to other companies in the same industry, Marathon Petroleum Corporation could be a good stock to invest in. However, it’s important to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Other Marathon Petroleum Corporation and Phillips 66 Grades

In addition to Momentum, Estimate Revisions and Quality, A+ Investor also provides grades for Value and Growth.

Growth investing builds on the idea that stocks of companies exhibiting strong, consistent and prolonged growth outperform those of slower-growth companies. AAII measures growth through consistency of annual sales growth, five-year sales growth rankings adjusted for extreme levels, and consistency of positive annual cash from operations.

Successful stock investing involves buying low and selling high, so stock valuation is an important consideration for stock selection. Buying stocks that are going to go up typically means buying stocks that are undervalued in the first place, although momentum investors may argue that point.

These 2 key factors, when combined with the above, provide a holistic view into a particular stock. Further, by joining A+ Investor you can see whether Marathon Petroleum Corporation and Phillips 66 pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Marathon Petroleum Corporation or Phillips 66 Stock?

Overall, Marathon Petroleum Corporation stock has a Momentum Score of 80, Estimate Revisions Score of 92 and Quality Score of 79.

Phillips 66 stock has a Momentum Score of 76, Estimate Revisions Score of 78 and Quality Score of 51.

Comparing Marathon Petroleum Corporation and Phillips 66’s grades, scores and metrics can act as a solid basis to determine whether they may be a good investment or not. You’ll also want to look at your portfolio’s asset allocation as well as your risk tolerance and financial goals to see if either of these stocks would make a good fit for you. AAII can help you figure out which investments align with your individual needs and preferences.

Investors are encouraged to do their own due diligence and research. In this way, individuals can effectively become managers of their own assets‐without having to rely on others for financial independence. You can count on AAII for timeless articles on financial planning and stock-picking, unbiased research and actionable analysis.

A+ Investor adds to our qualitative teaching with a powerful data suite to help you whittle down investment choices to find stocks, exchange-traded funds (ETFs) or mutual funds that meet your needs.

AAII Disclaimer

We make no representations or warranties that any investor will, or is likely to, achieve profits similar to those shown, because past, hypothetical or simulated performance is not necessarily indicative of future results. Before making an investment decision, you should consider your circumstances and whether the information on our content is applicable to your situation. This information was prepared in good faith, and we accept no liability for any errors or omissions. The full disclaimer can be read here.