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.
Alpha Pro TechSTU:APL -0.85%75 Piotroski F-Score is 9 as of Aug. 16, 2026, which is 50% above its 10-year median of 6.00. GuruFocus rates STU:APL with a GF Score™ of 75/100 and a GF Value™ of €4.93 (Fairly Valued). The stock has 4 warning signs investors should review. Among 1,739 Construction companies, Alpha Pro Tech ranks better than 99.94% on this metric.
Good Sign:
Piotroski F-Score is 9, 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
Alpha Pro Tech has an F-score of 9. It is a good or high score, which usually indicates a very healthy situation.
The historical rank and industry rank for Alpha Pro Tech's Piotroski F-Score or its related term are showing as below:
STU:APL'
s Piotroski F-Score Range Over the Past 10 Years
Min: 4 Med: 6 Max: 9
Current: 9
During the past 13 years, the highest Piotroski F-Score of Alpha Pro Tech was 9. The lowest was 4. And the median was 6.
Alpha Pro Tech (STU:APL) 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.
Alpha Pro Tech Piotroski F-Score Related Terms
Alpha Pro Tech Piotroski F-Score Historical Data
* Premium members only.
The historical data trend for Alpha Pro Tech'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.
STU:APL vs SNTL, INVE, CSTE: Piotroski F-Score Comparison
For the Building Products & Equipment subindustry, Alpha Pro Tech'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.
Alpha Pro Tech Piotroski F-Score vs Construction Industry
For the Construction industry and Industrials sector, Alpha Pro Tech's Piotroski F-Score distribution charts can be found below:
* The bar in red indicates where Alpha Pro Tech'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.
Alpha Pro Tech's current Net Income (TTM) was 3.62.
==> 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.
Alpha Pro Tech's return on assets of this year was 0.05706719. Alpha Pro Tech's return on assets of last year was 0.04787297.
==> This year is higher. ==> Score 1.
Question 4. Quality of Earnings (Accrual)
Compare Cash flow return on assets (2) to return on assets (1)
Alpha Pro Tech's gearing of this year was 0.08959436. Alpha Pro Tech's gearing of last year was 0.09597432.
==> 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
Alpha Pro Tech's current ratio of this year was 17.04347826. Alpha Pro Tech's current ratio of last year was 16.76396327.
==> 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.
Alpha Pro Tech's number of shares in issue this year was 10.348. Alpha Pro Tech's number of shares in issue last year was 10.611.
==> 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.
Alpha Pro Tech's gross margin of this year was 0.37969621. Alpha Pro Tech's gross margin of last year was 0.37918348.
==> 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
Alpha Pro Tech's asset turnover of this year was 0.83962859. Alpha Pro Tech's asset turnover of last year was 0.78911897.
==> This year's asset turnover is higher. ==> Score 1.
Evaluation
Piotroski F-Score
=
Que. 1
+
Que. 2
+
Que. 3
+
Que. 4
+
Que. 5
+
Que. 6
+
Que. 7
+
Que. 8
+
Que. 9
=
1
+
1
+
1
+
1
+
1
+
1
+
1
+
1
+
1
=
9
Good or high score = 7, 8, 9
Bad or low score = 0, 1, 2, 3
Alpha Pro Tech has an F-score of 9. It is a good or high score, which usually indicates a very healthy situation.
Alpha Pro Tech (STU:APL) has a Piotroski F-Score of 9 as of Aug. 16, 2026. The Piotroski F-score grades a company's business operating strength from 0-9. View historical data on Alpha Pro Tech and its competitors. This is 50% above median its historical median of 6.00. Over the past decade, Alpha Pro Tech's Piotroski F-Score has ranged from 4.00 to 9.00. According to the industry distribution chart, Alpha Pro Tech ranks #1 out of 1739 companies in the Construction industry, placing it in the top 0.099999999999994%.
Is Alpha Pro Tech's Piotroski F-Score too high?
Alpha Pro Tech's current Piotroski F-Score of 9 is 50% above median its 10-year median of 6.00. Over the past 10 years, this metric has ranged from a low of 4.00 to a high of 9.00. The Construction industry median Piotroski F-Score is 5.00. Alpha Pro Tech's value of 9 is 80% above this industry median. Based on the distribution chart, Alpha Pro Tech ranks #1 out of 1739 companies in the Construction industry, which is in the top quartile — a strong position relative to peers. Overall, Alpha Pro Tech has a GF Score™ of 75/100 and is considered Fairly Valued, reflecting its overall financial health beyond just this single metric.
How does Alpha Pro Tech's Piotroski F-Score compare to SNTL and INVE?
According to the Construction industry distribution chart, Alpha Pro Tech ranks #1 out of 1739 companies for Piotroski F-Score. This places Alpha Pro Tech in the top 0% of its industry — outperforming the majority of peers. The industry median Piotroski F-Score is 5.00. Alpha Pro Tech's value of 9 is 80% above this benchmark. Historically, Alpha Pro Tech's own Piotroski F-Score has ranged from 4.00 to 9.00 over the past decade. While the company's 10-year median is 6.00 vs. the industry median of 5.00, Alpha Pro Tech 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 Construction company?
The median Piotroski F-Score among Construction companies is 5.00, based on 1,739 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. Alpha Pro Tech's current Piotroski F-Score of 9 is 80% 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 Alpha Pro Tech and its competitors. For the Construction 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. Alpha Pro Tech's current Piotroski F-Score is 9, which is 50% 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 Alpha Pro Tech stock overvalued right now?
Based on GuruFocus' analysis, Alpha Pro Tech (STU:APL) is currently considered Fairly Valued. The stock's GF Value™ is €4.93, compared to a current price of €4.66 — trading 5.5% below its estimated fair value. The current Piotroski F-Score is 9, which is 50% above median its 10-year median of 6.00 and 80% above the Construction industry median of 5.00. Alpha Pro Tech's overall GF Score™ is 75/100 with 4 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 Alpha Pro Tech (STU:APL), the current Piotroski F-Score is 9 as of Aug. 16, 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 Alpha Pro Tech (STU:APL) Overvalued in 2026?
Based on GuruFocus' analysis, Alpha Pro Tech stock appears to be undervalued.
The current stock price of €4.66 is trading 5.5% below its estimated GF Value™ of €4.93.
GuruFocus considers Alpha Pro Tech to be Fairly Valued.
Key valuation signals for STU:APL:
Piotroski F-Score: 9 (50% above median its 10-year median of 6.00)
GF Value™: €4.93 vs. price of €4.66 (5.5% below fair value)
Industry Position: 80% above the Construction median (#1 of 1739)
No single metric tells the full story. See the STU:APL stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Alpha Pro Tech Ltd is in the business of protecting people, products, and environments. It is developing, manufacturing, and marketing a line of disposable protective apparel and infection control products for the cleanroom, industrial, pharmaceutical, medical, and dental markets. It also manufactures a line of building supply construction weatherization products that are sold under the Alpha Pro Tech brand name. The Company operates through two business segments: Building Supply and Disposable Protective Apparel. Key revenue is generated from Building Supply, consisting of a line of construction supply weatherization products. The construction supply weatherization products consist of housewrap and synthetic roof underlayment, and synthetic roof underlayment accessories.
75GF Score
Get the complete analysis for STU:APL
Piotroski F-Score is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.
Quick Browse
Personalize
Premium Gurus 
Create New Portfolio
STU:APL has been successfully added to your 
