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Phillips 66MEX:PSX 66 Piotroski F-Score is 8 as of Aug. 09, 2026, which is 33% above its 10-year median of 6.00. GuruFocus rates MEX:PSX with a GF Score™ of 66/100 and a GF Value™ of MXN2,861.58 (Modestly Overvalued). The stock has 8 warning signs investors should review. Among 989 Oil & Gas companies, Phillips 66 ranks better than 97.88% on this metric.
Good Sign:
Piotroski F-Score is 8, indicates a very healthy situation.
The zones of discrimination were as such:
Good or high score = 7, 8, 9
Bad or low score = 0, 1, 2, 3
Phillips 66 has an F-score of 7. It is a good or high score, which usually indicates a very healthy situation.
The historical rank and industry rank for Phillips 66's Piotroski F-Score or its related term are showing as below:
MEX:PSX'
s Piotroski F-Score Range Over the Past 10 Years
Min: 2 Med: 6 Max: 8
Current: 8
During the past 13 years, the highest Piotroski F-Score of Phillips 66 was 8. The lowest was 2. And the median was 6.
The developer of the system is Joseph D. Piotroski is relatively unknown accounting professor who shuns publicity and rarely gives interviews.
He graduated from the University of Illinois with a B.S. in accounting in 1989, received an M.B.A. from Indiana University in 1994. Five years later, in 1999, after earning a Ph.D. in accounting from the University of Michigan, he became an associate professor of accounting at the University of Chicago.
He wanted to see if he can develop a system (using a simple nine-point scoring system) that can increase the returns of a strategy of investing in low price to book (referred to in the paper as high book to market) value companies.
What he found was something that exceeded his most optimistic expectations.
Buying only those companies that scored highest (8 or 9) on his nine-point scale, or F-Score as he called it, over the 20 year period from 1976 to 1996 led to an average out-performance over the market of 13.4%.
Even more impressive were the results of a strategy of investing in the highest F-Score companies (8 or 9) and shorting companies with the lowest F-Score (0 or 1).
Over the same period from 1976 to 1996 (20 years) this strategy led to an average yearly return of 23%, substantially outperforming the average S&P 500 index return of 15.83% over the same period.
Phillips 66 Piotroski F-Score Related Terms
Phillips 66 Piotroski F-Score Historical Data
* Premium members only.
The historical data trend for Phillips 66's Piotroski F-Score can be seen below:
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
MEX:PSX vs VLO, MPC, DINO: Piotroski F-Score Comparison
For the Oil & Gas Refining & Marketing subindustry, Phillips 66's Piotroski F-Score, along with its competitors' market caps and Piotroski F-Score 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.
Phillips 66 Piotroski F-Score vs Oil & Gas Industry
For the Oil & Gas industry and Energy sector, Phillips 66's Piotroski F-Score distribution charts can be found below:
* The bar in red indicates where Phillips 66's Piotroski F-Score falls into.
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
This Year (Jun26) TTM:
Last Year (Jun25) TTM:
Net Income was 2439.779 + 52324.564 + 3732.769 + 67126.303 = MXN125,623 Mil. Cash Flow from Operations was 21609.468 + 49551.686 + -40826.033 + 126662.291 = MXN156,997 Mil. Revenue was 633150.063 + 614138.416 + 586784.058 + 889968.796 = MXN2,724,041 Mil. Gross Profit was 63654.374 + 74777.672 + 49878.448 + 117867.995 = MXN306,178 Mil.
Average Total Assets from the begining of this year (Jun25)
to the end of this year (Jun26) was
(1429927.107 + 1396287.128 + 1326659.977 + 1516261.548 + 1427502.69) / 5 = MXN1419327.69 Mil. Total Assets at the begining of this year (Jun25) was MXN1,429,927 Mil. Long-Term Debt & Capital Lease Obligation was MXN327,483 Mil. Total Current Assets was MXN422,632 Mil. Total Current Liabilities was MXN320,259 Mil.
Net Income was 6812.844 + 166.846 + 9963.143 + 16513.208 = MXN33,456 Mil.
Revenue was 699556.979 + 702524.254 + 622543.026 + 627445.432 = MXN2,652,070 Mil. Gross Profit was 54955.627 + 44047.238 + 40486.778 + 64584.156 = MXN204,074 Mil.
Average Total Assets from the begining of last year (Jun24)
to the end of last year (Jun25) was
(1391320.224 + 1478347.725 + 1513748.416 + 1469676.173 + 1429927.107) / 5 = MXN1456603.929 Mil. Total Assets at the begining of last year (Jun24) was MXN1,391,320 Mil. Long-Term Debt & Capital Lease Obligation was MXN323,862 Mil. Total Current Assets was MXN396,844 Mil. Total Current Liabilities was MXN370,653 Mil.
*Note: If the latest quarterly/semi-annual/annual total assets data is 0, then we will use previous quarterly/semi-annual/annual data for all the items in the balance sheet.
Profitability
Question 1. Return on Assets (ROA)
Net income before extraordinary items for the year divided by Total Assets at the beginning of the year.
Score 1 if positive, 0 if negative.
Phillips 66's current Net Income (TTM) was 125,623.
==> Positive ==> Score 1.
Question 2. Cash Flow Return on Assets (CFROA)
Net cash flow from operating activities (operating cash flow) divided by Total Assets at the beginning of the year.
Phillips 66's return on assets of this year was 0.08785302. Phillips 66's return on assets of last year was 0.02404626.
==> This year is higher. ==> Score 1.
Question 4. Quality of Earnings (Accrual)
Compare Cash flow return on assets (2) to return on assets (1)
Phillips 66's gearing of this year was 0.23073095. Phillips 66's gearing of last year was 0.22234063.
==> Last year is lower than this year ==> Score 0.
Question 6. Change in Working Capital (Liquidity)
Compare this year's current ratio (current assets divided by current liabilities) to last year's current ratio.
Score 1 if this year's current ratio is higher, 0 if it's lower
Phillips 66's current ratio of this year was 1.31965784. Phillips 66's current ratio of last year was 1.07066294.
==> This year's current ratio is higher. ==> Score 1.
Question 7. Change in Shares in Issue
Compare the number of shares in issue this year, to the number in issue last year.
Score 0 if there is larger number of shares in issue this year, 1 otherwise.
Phillips 66's number of shares in issue this year was 402.618. Phillips 66's number of shares in issue last year was 407.929.
==> There is smaller number of shares in issue this year, or the same. ==> Score 1.
Efficiency
Question 8. Change in Gross Margin
Compare this year's gross margin (Gross Profit divided by sales) to last year's.
Score 1 if this year's gross margin is higher, 0 if it's lower.
Phillips 66's gross margin of this year was 0.11239862. Phillips 66's gross margin of last year was 0.07694888.
==> This year's gross margin is higher. ==> Score 1.
Question 9. Change in asset turnover
Compare this year's asset turnover (total sales for the year divided by total assets at the beginning of the year) to last year's asset turnover ratio.
Score 1 if this year's asset turnover ratio is higher, 0 if it's lower
Phillips 66's asset turnover of this year was 1.90502112. Phillips 66's asset turnover of last year was 1.90615334.
==> Last year's asset turnover is higher ==> Score 0.
Evaluation
Piotroski F-Score
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Good or high score = 7, 8, 9
Bad or low score = 0, 1, 2, 3
Phillips 66 has an F-score of 7. It is a good or high score, which usually indicates a very healthy situation.
Phillips 66 (MEX:PSX) has a Piotroski F-Score of 8 as of Aug. 09, 2026. The Piotroski F-score grades a company's business operating strength from 0-9. View historical data on Phillips 66 and its competitors. This is 33% above median its historical median of 6.00. Over the past decade, Phillips 66's Piotroski F-Score has ranged from 2.00 to 8.00. According to the industry distribution chart, Phillips 66 ranks #21 out of 989 companies in the Oil & Gas industry, placing it in the top 2.1%.
Is Phillips 66's Piotroski F-Score too high?
Phillips 66's current Piotroski F-Score of 8 is 33% above median its 10-year median of 6.00. Over the past 10 years, this metric has ranged from a low of 2.00 to a high of 8.00. The Oil & Gas industry median Piotroski F-Score is 5.00. Phillips 66's value of 8 is 60% above this industry median. Based on the distribution chart, Phillips 66 ranks #21 out of 989 companies in the Oil & Gas industry, which is in the top quartile — a strong position relative to peers. Overall, Phillips 66 has a GF Score™ of 66/100 and is considered Modestly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Phillips 66's Piotroski F-Score compare to VLO and MPC?
According to the Oil & Gas industry distribution chart, Phillips 66 ranks #21 out of 989 companies for Piotroski F-Score. This places Phillips 66 in the top 2% of its industry — outperforming the majority of peers. The industry median Piotroski F-Score is 5.00. Phillips 66's value of 8 is 60% above this benchmark. Historically, Phillips 66's own Piotroski F-Score has ranged from 2.00 to 8.00 over the past decade. While the company's 10-year median is 6.00 vs. the industry median of 5.00, Phillips 66 has consistently been above the industry average. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Piotroski F-Score for an Oil & Gas company?
The median Piotroski F-Score among Oil & Gas companies is 5.00, based on 989 companies in the industry. Companies in the top quartile (top 25%) have a Piotroski F-Score significantly above this median, while those in the bottom quartile fall well below. However, Piotroski F-Score should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Phillips 66's current Piotroski F-Score of 8 is 60% above the industry median. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Piotroski F-Score mean?
A high Piotroski F-Score can signal that a stock is expensive relative to its fundamentals. The Piotroski F-score grades a company's business operating strength from 0-9. View historical data on Phillips 66 and its competitors. For the Oil & Gas industry, the median Piotroski F-Score is 5.00 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Phillips 66's current Piotroski F-Score is 8, which is 33% above median its own 10-year median of 6.00. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Phillips 66 stock overvalued right now?
Based on GuruFocus' analysis, Phillips 66 (MEX:PSX) is currently considered Modestly Overvalued. The stock's GF Value™ is MXN2,861.58, compared to a current price of MXN3,300.00 — trading 15.3% above its estimated fair value. The current Piotroski F-Score is 8, which is 33% above median its 10-year median of 6.00 and 60% above the Oil & Gas industry median of 5.00. Phillips 66's overall GF Score™ is 66/100 with 8 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Piotroski F-Score calculated?
Piotroski F-Score is calculated from a company's financial statements. For Phillips 66 (MEX:PSX), the current Piotroski F-Score is 8 as of Aug. 09, 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 Phillips 66 (MEX:PSX) Overvalued in 2026?
Based on GuruFocus' analysis, Phillips 66 stock appears to be overvalued.
The current stock price of MXN3,300.00 is trading 15.3% above its estimated GF Value™ of MXN2,861.58.
GuruFocus considers Phillips 66 to be Modestly Overvalued.
Key valuation signals for MEX:PSX:
Piotroski F-Score: 8 (33% above median its 10-year median of 6.00)
GF Value™: MXN2,861.58 vs. price of MXN3,300.00 (15.3% above fair value)
Industry Position: 60% above the Oil & Gas median (#21 of 989)
No single metric tells the full story. See the MEX:PSX stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Phillips 66 is an independent refiner that owns or holds interest in 10 refineries with a total crude throughput capacity of 2.0 million barrels per day, or mmb/d, at the end of 2025. The midstream segment comprises extensive transportation and NGL processing assets. It includes 70,000 miles of crude oil, refined petroleum product, NGL and natural gas pipeline systems, and a comprehensive set of refined petroleum product, NGL and crude oil terminals, gathering and processing plants and fractionation facilities and various other storage and loading facilities. Its CPChem chemical joint venture operates facilities primarily in the United States and the Middle East and produces olefins and polyolefins.
66GF Score
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