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The Piotroski F-Score: A Tool for Value Investors

Updated: Mar 11

When it comes to value investing, not all undervalued stocks are created equal. Some might be diamonds in the rough, while others are cheap for a reason. Distinguishing between the two is where the Piotroski F-Score comes into play. Developed by Stanford accounting professor Joseph Piotroski in the early 2000s, the F-Score is a metric used to identify the health of a firm's financials. It's particularly useful for sifting through a vast array of low price-to-book value companies.

What is the Piotroski F-Score?

The Piotroski F-Score is a scoring system that evaluates the financial strength of a company based on nine criteria, which are derived from the company's financial statements. The score ranges from 0 to 9, with a higher score indicating a stronger financial position. The nine criteria are split across three main categories:

  • Profitability

  • Leverage, Liquidity, and Source of Funds

  • Operating Efficiency

Each of the nine criteria contributes one point if met. Let's delve into each criterion.


  • Positive Return on Assets (ROA): A positive ROA indicates that the company is profitable.

  • Positive Operating Cash Flow: This implies that the company is generating cash from its operations.

  • Change in ROA: This is positive if ROA has increased from the previous year.

  • Accruals: Indicates if operating cash flow exceeds net income. A higher operating cash flow relative to net income is seen as a positive signal.

Leverage, Liquidity, and Source of Funds:

  • Decrease in Long-term Debt: A reduction in long-term debt relative to assets is a positive sign.

  • Increase in Current Ratio: This indicates an improvement in the company's liquidity position.

  • No New Shares Issued: Companies that haven't diluted shareholders by issuing more shares are awarded a point.

Operating Efficiency:

  • Improvement in Gross Margin: An increasing gross margin indicates improving efficiency or pricing power.

  • Improvement in Asset Turnover: Indicates that the company is generating more sales for each dollar of assets.

How to Use the Piotroski F-Score?

The F-Score is particularly useful when applied to companies with a low price-to-book (P/B) value. Piotroski's original study found that by focusing on high F-Score companies among a portfolio of low P/B stocks, returns could be significantly enhanced. Scoring:

  • 8-9: Strong score indicating robust financial health.

  • 4-7: Moderate score suggesting average financial health.

  • 0-3: Weak score implying potential financial distress.

Practical Example:

Consider a hypothetical company, "TechNest," with the following financial changes over the year:

  • Positive ROA: Yes (+1)

  • Positive Operating Cash Flow: Yes (+1)

  • Change in ROA: Increased (+1)

  • Accruals: Operating cash flow > Net income (+1)

  • Decrease in Long-term Debt: Yes (+1)

  • Increase in Current Ratio: Yes (+1)

  • No New Shares Issued: Yes (+1)

  • Improvement in Gross Margin: No (0)

  • Improvement in Asset Turnover: Yes (+1)

TechNest's Piotroski F-Score would be 1+ 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 = 8. Given this score, an investor might view TechNest as a strong financial candidate among other low P/B stocks.


  • Objective Measure: The F-Score is based on concrete financial metrics, reducing subjectivity.

  • Focus on Fundamentals: It directs investors' attention to core financial health rather than market sentiment.

  • Enhances Value Strategy: Piotroski's research suggests that combining the F-Score with low P/B strategies can lead to superior returns.


  • Historical Data: The F-Score relies on past financial data, which may not always be indicative of future performance.

  • May Not Apply to All Sectors: Some criteria might be more relevant to certain industries than others.

  • Doesn't Consider Growth: High-growth companies might not fare well on certain criteria but could still be good investments.

The Piotroski F-Score is a valuable tool for value investors looking to separate the wheat from the chaff in the world of low P/B stocks. While no metric should be used in isolation, the F-Score can be a robust addition to an investor's toolkit, helping to focus on companies with strong financial fundamentals.

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