Focused on building reliable datasets, financial models, and research tools for value-minded investors. Committed to turning complex data into practical guidance for value-investing and long-term wealth.
Dr. Charlie Tian is the founder and CEO of GuruFocus.com, a leading global investment research platform established in 2004. With a Ph.D. in physics, Dr. Tian transitioned from science to finance, applying a data-driven, disciplined approach to value investing.
Marathon PetroleumMEX:MPC 61 3-Year Share Buyback Ratio is 13.40 as of Mar. 2026, which is 158% above its 10-year median of 5.20. GuruFocus rates MEX:MPC with a GF Score™ of 61/100 and a GF Value™ of MXN3,247.48 (Modestly Overvalued). The stock has 6 warning signs investors should review. Among 681 Oil & Gas companies, Marathon Petroleum ranks better than 99.56% on this metric.
Shares Outstanding (EOP) are shares that have been authorized, issued, and purchased by investors and are held by them.
3-Year Share Buyback Ratio measures the average annual proportion of a company's outstanding shares repurchased over the past three years. It is calculated as the annualized percentage change in shares outstanding from three years ago to the current year. A positive ratio may indicate share buybacks over the period, while a zero or negative ratio may reflect no repurchases or potential share issuance. Marathon Petroleum's current 3-Year Share Buyback Ratio was 13.40%.
The historical rank and industry rank for Marathon Petroleum's 3-Year Share Buyback Ratio or its related term are showing as below:
MEX:MPC'
s 3-Year Share Buyback Ratio Range Over the Past 10 Years
Min: -10.2 Med: 5.2 Max: 18.3
Current: 13.4
During the past 13 years, Marathon Petroleum's highest 3-Year Share Buyback Ratio was 18.30%. The lowest was -10.20%. And the median was 5.20%.
MEX:MPC's 3-Year Share Buyback Ratio is ranked better than 99.56% of 681
companies
in the Oil & Gas industry
Industry Median: -3.5
vs MEX:MPC: 13.40
Marathon Petroleum (MEX:MPC) 3-Year Share Buyback Ratio Explanation
A negative number means the company might be issuing new shares. A positive number indicates that the company is buying back shares.
Be Aware
Investors usually like share buybacks. But as pointed by Warren Buffett, only if a company buys back shares at the prices below the stock's intrinsic value, it rewards remaining shareholders. If a company buys its overvalued stocks back, it destroys shareholder value.
Marathon Petroleum 3-Year Share Buyback Ratio Related Terms
MEX:MPC vs VLO, PSX, DINO: 3-Year Share Buyback Ratio Comparison
For the Oil & Gas Refining & Marketing subindustry, Marathon Petroleum's 3-Year Share Buyback Ratio, along with its competitors' market caps and 3-Year Share Buyback Ratio data, can be viewed below:
* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.
Marathon Petroleum 3-Year Share Buyback Ratio vs Oil & Gas Industry
For the Oil & Gas industry and Energy sector, Marathon Petroleum's 3-Year Share Buyback Ratio distribution charts can be found below:
* The bar in red indicates where Marathon Petroleum's 3-Year Share Buyback Ratio falls into.
Marathon Petroleum 3-Year Share Buyback Ratio Calculation
This is the annualized percentage change in shares outstanding from three years ago to the current year. The annualized percentage change is calculated with expontential compound based on the latest four years of annual data on Shares Outstanding (EOP).
Please click Growth Rate Calculation Example (GuruFocus) to see how GuruFocus calculates Wal-Mart Stores Inc (WMT)'s revenue growth rate. You can apply the same method to get the average dividends per share growth rate.
What does a 3-Year Share Buyback Ratio of 13.40 mean?
Marathon Petroleum (MEX:MPC) has a 3-Year Share Buyback Ratio of 13.40 as of Mar. 2026. The 3-Year Share Buyback Ratio measures the average annual proportion of a company's outstanding shares repurchased over the past three years. It is calculated as the annualized percentage change in shares outstanding from three years ago to the current year. View historical data for Marathon Petroleum and its competitors. This is 158% above median its historical median of 5.20. According to the industry distribution chart, Marathon Petroleum ranks #3 out of 681 companies in the Oil & Gas industry, placing it in the top 0.40000000000001%.
Is Marathon Petroleum's 3-Year Share Buyback Ratio too high?
Marathon Petroleum's current 3-Year Share Buyback Ratio of 13.40 is 158% above median its 10-year median of 5.20. Based on the distribution chart, Marathon Petroleum ranks #3 out of 681 companies in the Oil & Gas industry, which is in the top quartile — a strong position relative to peers. Overall, Marathon Petroleum has a GF Score™ of 61/100 and is considered Modestly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Marathon Petroleum's 3-Year Share Buyback Ratio compare to VLO and PSX?
According to the Oil & Gas industry distribution chart, Marathon Petroleum ranks #3 out of 681 companies for 3-Year Share Buyback Ratio. This places Marathon Petroleum in the top 0% of its industry — outperforming the majority of peers. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good 3-Year Share Buyback Ratio for an Oil & Gas company?
A good 3-Year Share Buyback Ratio depends on the Oil & Gas industry context. However, 3-Year Share Buyback Ratio should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high 3-Year Share Buyback Ratio mean?
A high 3-Year Share Buyback Ratio can signal that a stock is expensive relative to its fundamentals. The 3-Year Share Buyback Ratio measures the average annual proportion of a company's outstanding shares repurchased over the past three years. It is calculated as the annualized percentage change in shares outstanding from three years ago to the current year. View historical data for Marathon Petroleum and its competitors. Marathon Petroleum's current 3-Year Share Buyback Ratio is 13.40, which is 158% above median its own 10-year median of 5.20. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Marathon Petroleum stock overvalued right now?
Based on GuruFocus' analysis, Marathon Petroleum (MEX:MPC) is currently considered Modestly Overvalued. The stock's GF Value™ is MXN3,247.48, compared to a current price of MXN4,680.00 — trading 44.1% above its estimated fair value. The current 3-Year Share Buyback Ratio is 13.40, which is 158% above median its 10-year median of 5.20. Marathon Petroleum's overall GF Score™ is 61/100 with 6 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is 3-Year Share Buyback Ratio calculated?
3-Year Share Buyback Ratio is calculated from a company's financial statements. For Marathon Petroleum (MEX:MPC), the current 3-Year Share Buyback Ratio is 13.40 as of Mar. 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
Is Marathon Petroleum (MEX:MPC) Overvalued in 2026?
Based on GuruFocus' analysis, Marathon Petroleum stock appears to be overvalued.
The current stock price of MXN4,680.00 is trading 44.1% above its estimated GF Value™ of MXN3,247.48.
GuruFocus considers Marathon Petroleum to be Modestly Overvalued.
Key valuation signals for MEX:MPC:
3-Year Share Buyback Ratio: 13.40 (158% above median its 10-year median of 5.20)
GF Value™: MXN3,247.48 vs. price of MXN4,680.00 (44.1% above fair value)
No single metric tells the full story. See the MEX:MPC stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Marathon Petroleum is a leading integrated downstream and midstream energy company that operates 13 refineries in the Gulf Coast, Mid-Continent, and West Coast regions of the United States with an aggregate crude oil refining capacity of 3.0 million barrels per day. The company is one of the largest producers of renewable diesel in the US; its Dickinson, North Dakota facility has the capacity to produce 184 million gallons per year, and its Martinez, California, joint venture facility (a 50/50 partnership with Neste) reached its full capacity of 730 million gallons per year in late 2024. Marathon also owns the general partner and approximately 64% of MPLX LP, a large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets.
61GF Score
Get the complete analysis for MEX:MPC
3-Year Share Buyback Ratio is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.
Quick Browse
Personalize
Premium Gurus 
Create New Portfolio
MEX:MPC has been successfully added to your 
