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 MPLX LP, Plains All American Pipeline or L.P. 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 MPLX LP, Plains All American Pipeline and L.P. compare based on key financial metrics to determine which better meets your investment needs.

About MPLX LP, Plains All American Pipeline and L.P.

MPLX LP owns and operates midstream energy infrastructure and logistics assets primarily in the United States. It operates in two segments, Crude Oil and Products Logistics; and Natural Gas and NGL Services. The company is involved in the gathering, processing, and transportation of natural gas; gathering, transportation, fractionation, storage, and marketing of natural gas liquids; gathering, storage, transportation, and distribution of crude oil and refined products, as well as other hydrocarbon-based products and renewables; and sale of residue gas and condensate. It also engages in inland marine businesses, comprising fleet of boats and barges transport light products, heavy oils, crude oil, renewable fuels, chemicals, and feedstocks in the Mid-Continent and Gulf Coast regions, as well as a marine repair facility located on the Ohio River; and distribution of fuel, as well as operates refining logistics, terminals, rail facilities, and storage caverns. In addition, it operates terminal facilities for the receipt, storage, blending, additization, handling, and redelivery of refined petroleum products through the pipeline, rail, marine, and truck transportation. MPLX GP LLC acts as the general partner of MPLX LP. The company was incorporated in 2012 and is headquartered in Findlay, Ohio. MPLX LP operates as a subsidiary of Marathon Petroleum Corporation.

Plains All American Pipeline, L.P., through its subsidiaries, engages in the pipeline transportation, terminalling, storage, and gathering of crude oil and natural gas liquids (NGL) in the United States and Canada. The company operates through two segments, Crude Oil and NGL. The Crude Oil segment offers gathering and transporting crude oil through pipelines, trucks, and on barges or railcars. This segment provides terminalling, storage, and other related services, as well as merchant activities. The NGL segment is involved in natural gas processing and NGL fractionation, storage, transportation, and terminaling. This segment also includes ethane, propane, normal butane, iso-butane, and natural gasoline derived from natural gas production and processing activities, as well as crude oil refining processes. Its NGL components are used for various applications, such as heating, engine, and industrial fuels. The company was founded in 1981 and is headquartered in Houston, Texas. Plains All American Pipeline, L.P. operates as a subsidiary of Plains GP Holdings, L.P.

Latest Oil, Gas & Consumable Fuels and MPLX LP, Plains All American Pipeline, L.P. Stock News

As of May 29, 2026, MPLX LP had a $55.5 billion market capitalization, compared to the Oil, Gas & Consumable Fuels median of $2.4 million. MPLX LP’s stock is up 2.8% in 2026, down 2.8% in the previous five trading days and up 7.45% in the past year.

Currently, MPLX LP’s price-earnings ratio is 11.8. MPLX LP’s trailing 12-month revenue is $11.7 billion with a 40.0% net profit margin. Year-over-year quarterly sales growth most recently was -2.8%. Analysts expect adjusted earnings to reach $4.576 per share for the current fiscal year. MPLX LP currently has a 7.9% dividend yield.

As of May 29, 2026, Plains All American Pipeline, L.P. had a $15.8 billion market cap, putting it in the 83rd percentile of all stocks. Plains All American Pipeline, L.P.’s stock is up 28.5% in 2026, down 4.5% in the previous five trading days and up 34.4% in the past year.

Currently, Plains All American Pipeline, L.P.’s price-earnings ratio is 20.2. Plains All American Pipeline, L.P.’s trailing 12-month revenue is $45.3 billion with a 2.5% net profit margin. Year-over-year quarterly sales growth most recently was 8.7%. Analysts expect adjusted earnings to reach $1.842 per share for the current fiscal year. Plains All American Pipeline, L.P. currently has a 7.4% dividend yield.

How We Compare MPLX LP, Plains All American Pipeline and L.P. 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 MPLX LP, Plains All American Pipeline and L.P.’s stock grades to see how they measure up against one another.

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MPLX LP, Plains All American Pipeline and L.P. Stock Value Grades

Company	Ticker	Value
MPLX LP	MPLX	C
Plains All American Pipeline, L.P.	PAA	B

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.

AAII’s A+ Investor Value Grade derives from a stock’s value score. The Value Score is the percentile rank of the average of the percentile ranks of the price-to-sales ratio, price-earnings ratio, enterprise-value-to-EBITDA (EV/EBITDA) ratio, shareholder yield, price-to-book-value ratio and price-to-free-cash-flow ratio. The score is variable, meaning it can consider all six ratios or, should any of the six ratios not be valid, the remaining ratios that are valid. To be assigned a Value Score, stocks must have a valid (non-null) ratio and corresponding ranking for at least two of the six valuation ratios.

Stocks with a Value Score from 81 to 100 are considered deep value, those with a score between 61 and 80 are a good value and so on.

MPLX LP has a Value Score of 57, which is Average. Plains All American Pipeline, L.P. has a Value Score of 71, which is Value.

The Value Stock Winner: Plains All American Pipeline, L.P.

As you can clearly see from the Value Grade breakdown above, Plains All American Pipeline, L.P. is considered to have better value than MPLX LP. For investors who focus solely on a company’s valuation, Plains All American Pipeline, L.P. could be a good stock to add to their portfolio. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

MPLX LP, Plains All American Pipeline and L.P. Growth Grades

Company	Ticker	Growth
MPLX LP	MPLX	A
Plains All American Pipeline, L.P.	PAA	B

The foundation of growth investing is seeking out stocks of companies exhibiting strong, consistent and prolonged growth that is expected to continue into the future.

In order to compute the growth score and assign it a letter grade, the percentile ranks for each of three components‐consistency of annual sales growth, five-year sales growth rankings adjusted for extreme levels, and consistency of positive annual cash from operations‐must be determined. These three rank figures are added together, and the sum is ranked against the entire stock universe to arrive at a company’s Growth Score to create an equal distribution of grades.

The companies in the bottom 20% of the stock universe receive Growth Grades of F, considered to be very weak, while those in the top 20% receive A grades, which are considered very strong.

MPLX LP has a Growth Score of 95, which is Very Strong. Plains All American Pipeline, L.P. has a Growth Score of 64, which is Strong.

The Growth Grade Winner: MPLX LP

As you can clearly see from the Growth Grade breakdown above, MPLX LP has a more attractive growth grade than Plains All American Pipeline, L.P.. For investors who focus solely on how a company is growing relative to other companies in the same industry, MPLX LP could be a good stock to add to their portfolio. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

MPLX LP, Plains All American Pipeline and L.P.’s Quality Grades

Company	Ticker	Quality
MPLX LP	MPLX	B
Plains All American Pipeline, L.P.	PAA	D

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.

MPLX LP has a Quality Score of 64, which is Strong. Plains All American Pipeline, L.P. has a Quality Score of 32, which is Weak.

The Quality Grade Winner: MPLX LP

As you can clearly see from the Quality Grade breakdown above, MPLX LP has a better overall quality grade than Plains All American Pipeline, L.P.. For investors who are looking for companies with higher quality than others in the same industry, MPLX LP 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.

Other MPLX LP, Plains All American Pipeline and L.P. Grades

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

Momentum grades help 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.

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

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 MPLX LP, Plains All American Pipeline and L.P. pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, MPLX LP, Plains All American Pipeline or L.P. Stock?

Overall, MPLX LP stock has a Value Score of 57, Growth Score of 95 and Quality Score of 64.

Plains All American Pipeline, L.P. stock has a Value Score of 71, Growth Score of 64 and Quality Score of 32.

Comparing MPLX LP, Plains All American Pipeline and L.P.’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.