Ero CopperERO -4.72%91 Piotroski F-Score is 8 as of Jun. 24, 2026, which is 60% above its 10-year median of 5.00. GuruFocus rates ERO with a GF Score™ of 91/100 and a GF Value™ of $36.24 (Modestly Undervalued). The stock has 5 warning signs investors should review. Among 2,510 Metals & Mining companies, Ero Copper ranks better than 99% 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
Ero Copper has an F-score of 8. It is a good or high score, which usually indicates a very healthy situation.
The historical rank and industry rank for Ero Copper's Piotroski F-Score or its related term are showing as below:
ERO'
s Piotroski F-Score Range Over the Past 10 Years
Min: 2 Med: 5 Max: 9
Current: 8
During the past 10 years, the highest Piotroski F-Score of Ero Copper was 9. The lowest was 2. And the median was 5.
Ero Copper (NYSE:ERO) Piotroski F-Score Explanation
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.
Ero Copper Piotroski F-Score Related Terms
Ero Copper Piotroski F-Score Historical Data
* Premium members only.
The historical data trend for Ero Copper'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.
For the Copper subindustry, Ero Copper'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.
Ero Copper Piotroski F-Score vs Metals & Mining Industry
For the Metals & Mining industry and Basic Materials sector, Ero Copper's Piotroski F-Score distribution charts can be found below:
* The bar in red indicates where Ero Copper'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.
*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.
Ero Copper's current Net Income (TTM) was 292.3.
==> 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.
Ero Copper's return on assets of this year was 0.17338061. Ero Copper's return on assets of last year was 0.01259084.
==> This year is higher. ==> Score 1.
Question 4. Quality of Earnings (Accrual)
Compare Cash flow return on assets (2) to return on assets (1)
Ero Copper's gearing of this year was 0.29483938. Ero Copper's gearing of last year was 0.39419536.
==> This year is lower or equal to last year. ==> Score 1.
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
Ero Copper's current ratio of this year was 1.2956075. Ero Copper's current ratio of last year was 1.04613417.
==> 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.
Ero Copper's number of shares in issue this year was 105.024. Ero Copper's number of shares in issue last year was 103.905.
==> There is larger number of shares in issue this year. ==> Score 0.
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.
Ero Copper's gross margin of this year was 0.42754615. Ero Copper's gross margin of last year was 0.41854014.
==> 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
Ero Copper's asset turnover of this year was 0.54809764. Ero Copper's asset turnover of last year was 0.32625297.
==> This year's asset turnover is higher. ==> Score 1.
Evaluation
Piotroski F-Score
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Good or high score = 7, 8, 9
Bad or low score = 0, 1, 2, 3
Ero Copper has an F-score of 8. It is a good or high score, which usually indicates a very healthy situation.
Ero Copper (ERO) has a Piotroski F-Score of 8 as of Jun. 24, 2026. The Piotroski F-score grades a company's business operating strength from 0-9. View historical data on Ero Copper and its competitors. This is 60% above median its historical median of 5.00. Over the past decade, Ero Copper's Piotroski F-Score has ranged from 2.00 to 9.00. According to the industry distribution chart, Ero Copper ranks #25 out of 2510 companies in the Metals & Mining industry, placing it in the top 1%.
Is Ero Copper's Piotroski F-Score too high?
Ero Copper's current Piotroski F-Score of 8 is 60% above median its 10-year median of 5.00. Over the past 10 years, this metric has ranged from a low of 2.00 to a high of 9.00. The Metals & Mining industry median Piotroski F-Score is 3.00. Ero Copper's value of 8 is 166.7% above this industry median. Based on the distribution chart, Ero Copper ranks #25 out of 2510 companies in the Metals & Mining industry, which is in the top quartile — a strong position relative to peers. Overall, Ero Copper has a GF Score™ of 91/100 and is considered Modestly Undervalued, reflecting its overall financial health beyond just this single metric.
How does Ero Copper's Piotroski F-Score compare to SCCO and FCX?
According to the Metals & Mining industry distribution chart, Ero Copper ranks #25 out of 2510 companies for Piotroski F-Score. This places Ero Copper in the top 1% of its industry — outperforming the majority of peers. The industry median Piotroski F-Score is 3.00. Ero Copper's value of 8 is 166.7% above this benchmark. Historically, Ero Copper's own Piotroski F-Score has ranged from 2.00 to 9.00 over the past decade. While the company's 10-year median is 5.00 vs. the industry median of 3.00, Ero Copper 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 a Metals & Mining company?
The median Piotroski F-Score among Metals & Mining companies is 3.00, based on 2,510 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. Ero Copper's current Piotroski F-Score of 8 is 166.7% 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 Ero Copper and its competitors. For the Metals & Mining industry, the median Piotroski F-Score is 3.00 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Ero Copper's current Piotroski F-Score is 8, which is 60% above median its own 10-year median of 5.00. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Ero Copper stock overvalued right now?
Based on GuruFocus' analysis, Ero Copper (ERO) is currently considered Modestly Undervalued. The stock's GF Value™ is $36.24, compared to a current price of $26.44 — trading 27% below its estimated fair value. The current Piotroski F-Score is 8, which is 60% above median its 10-year median of 5.00 and 166.7% above the Metals & Mining industry median of 3.00. Ero Copper's overall GF Score™ is 91/100 with 5 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 Ero Copper (ERO), the current Piotroski F-Score is 8 as of Jun. 24, 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 Ero Copper (ERO) Overvalued in 2026?
Based on GuruFocus' analysis, Ero Copper stock appears to be undervalued.
The current stock price of $26.44 is trading 27% below its estimated GF Value™ of $36.24.
GuruFocus considers Ero Copper to be Modestly Undervalued.
Key valuation signals for ERO:
Piotroski F-Score: 8 (60% above median its 10-year median of 5.00)
GF Value™: $36.24 vs. price of $26.44 (27% below fair value)
Industry Position: 166.7% above the Metals & Mining median (#25 of 2510)
No single metric tells the full story. See the ERO stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Ero Copper Corp is a high-margin, high-growth copper producer with operations in Brazil. Its primary asset is its 99.6% ownership interest in Mineracao Caraiba S.A., held indirectly through its wholly-owned subsidiary. The company also owns a 97.6% ownership interest in NX Gold S.A. indirectly through its wholly-owned subsidiary. Its reporting segments include its three operating mines in Brazil, the Caraiba Operations, the Tucuma Operation, and the Xavantina Operations, and its corporate head office in Canada.
91GF Score
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