Marathon Petroleum vs Phillips 66
Prices at close . Model readings .
Marathon Petroleum
$440.77+1.1%- Market value
- $127.82B
- P/E
- 9.3
- 1 year
- +128.4%
Phillips 66
$273.76+1.95%- Market value
- $109.22B
- P/E
- 10.3
- 1 year
- +108.1%
Price change, with the S&P 500 as a benchmark
Percent change in each close since the start of the chosen range, for both companies and the S&P 500 (SPY). Daily closes over the last year, weekly before that and monthly before five years.
How the two compare
On the latest closes (28 Oct 2026), Marathon Petroleum is the larger company by market value ($127.82B against $109.22B). Over the past year Marathon Petroleum returned +128.4% and Phillips 66 +108.1%, while the S&P 500 returned +12.7%. The latest filed P/E is 9.3 for Marathon Petroleum and 10.3 for Phillips 66, and the operating margin 14.1% against 16.8%. Over the next 21 sessions the model expects −0.51% for Marathon Petroleum, with a 35% chance of a rise, and −0.4% for Phillips 66, with a 23% chance. Marathon Petroleum's long-run fair value is $438.90, a gap of −0.4% to its price; the long-run model view is neutral. Phillips 66's long-run fair value is $278.22, a gap of +1.6% to its price; the long-run model view is neutral.
What the model expects
Expected returns and the chance of a rise from our forecasting models, and the long-run fair value against the price. Readings, not advice.
How the prices moved
Price change over each period, with the S&P 500 (SPY) for comparison.
What the market pays
Size and the multiples from the latest filed quarter. A P/E on losses reads n/m.
How much of revenue becomes profit
Margins and returns on capital from the latest filing; revenue, net income and earnings per share over the trailing twelve months.
How fast the business grew
Change against the same quarter a year earlier.
Balance sheet and quality scores
Leverage, liquidity and two published scores: Altman Z (below 1.8 the distress zone, above 3 the safe zone) and Piotroski F (0 to 9).
How the shares trade
Volatility, sensitivity to the market, the deepest fall, short interest and how closely the two move together.
Marathon Petroleum or Phillips 66: common questions
Which is larger by market value, Marathon Petroleum or Phillips 66?
Marathon Petroleum, at $127.82B against $109.22B for Phillips 66, on the latest closes (28 Oct 2026).
Which has the higher P/E ratio, Marathon Petroleum or Phillips 66?
Phillips 66 has the higher latest filed P/E, 10.3; Marathon Petroleum's is 9.3. Filings: quarter to 30 Jun 2026 and 30 Sep 2026.
How did Marathon Petroleum and Phillips 66 move over the past year against the S&P 500?
Over the past year Marathon Petroleum returned +128.4% and Phillips 66 +108.1%, while the S&P 500 returned +12.7%. Prices at close 28 Oct 2026.
What does the model expect for Marathon Petroleum and Phillips 66 over the next month?
−0.51% for Marathon Petroleum with a 35% chance of a rise, and −0.4% for Phillips 66 with a 23% chance, over the next 21 sessions. Model readings 28 Oct 2026. These are model readings, not advice.
How do the operating margins of Marathon Petroleum and Phillips 66 compare?
The operating margin is 14.1% for Marathon Petroleum and 16.8% for Phillips 66, and the gross margin 17.2% against 19.2%. Filings: quarter to 30 Jun 2026 and 30 Sep 2026.
Do Marathon Petroleum and Phillips 66 shares move together?
Over the past year the correlation of their daily returns was 0.87 (closely together); 1 means they always move together, 0 unrelated, −1 opposite. Prices at close 28 Oct 2026.
Model readings are research estimates, not investment advice. Prices: daily closes. Fundamentals: the latest SEC filings. Short interest: FINRA, settlement 30 Sep 2026. A dash means the figure is not in our data; it is never shown as zero. The model view follows a published rule: next month by the sign of the expected return, the long run positive at a fair value 10% or more above the price and negative at 10% or more below it.