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Piotroski F-Score: Rebuilding the Nine Financial Signals

For educational purposes only; not investment advice.

Direct answer

Section titled “Direct answer”

The Piotroski F-Score adds nine binary financial-statement signals. Each condition earns 1; otherwise it earns 0, producing a score from 0 to 9. Joseph Piotroski developed the framework to distinguish financially strong from weak firms within a portfolio of high book-to-market companies, not as a universal credit rating or stand-alone valuation model.

The score asks whether current profitability and cash generation are positive, whether profitability and operating efficiency improved, and whether leverage, liquidity, and equity financing became more favorable. A high score describes the selected accounting signals for the measured period; it does not prove that a stock is cheap or that improvement will continue.

The nine signals

Section titled “The nine signals”

Use comparable annual statements and document the exact replication. Common implementations follow these conditions:

Group Signal earns 1 when
Profitability ROA > 0
Profitability CFO > 0
Profitability Current ROA > prior ROA
Profitability CFO > net income on a consistent asset-scaled basis
Leverage/liquidity Long-term-debt ratio declined
Leverage/liquidity Current ratio increased
Financing No common equity was issued during the year
Efficiency Gross margin increased
Efficiency Asset turnover increased

The original research defines variables precisely for its sample. Replications sometimes use beginning versus average assets, different long-term-debt fields, or share-count changes as a proxy for equity issuance. Those choices can change the score. Do not combine a provider’s score with another provider’s thresholds without first reconciling formulas.

Build inputs from the income statement, balance sheet, cash-flow statement, statement of stockholders’ equity, and EPS/share footnotes. “No equity issuance” concerns financing activity; a changed diluted weighted-average share count can also reflect options, restricted stock, buybacks, conversions, acquisitions, or timing and is not an exact substitute.

Full scoring example

Section titled “Full scoring example”

Assume the following consistent annual calculations:

Signal Prior year Current year Point
Net income / average assets -1.0% 2.9% 1
CFO $5m $40m 1
Change in ROA -1.0% 2.9% 1
CFO versus net income $5m vs -$10m $40m vs $30m 1
Long-term debt / average assets 40.0% 33.3% 1
Current ratio 1.50 1.70 1
Common equity issuance none none 1
Gross margin 35% 38% 1
Asset turnover 0.80 0.86 1

The total is 9. The calculation says all nine selected signals passed; it does not explain why. The CFO increase may come from delayed supplier payments, debt could decline after an asset sale, margin could rise at a commodity peak, and turnover could improve because impaired assets reduced the denominator. Each point needs a financial-statement bridge.

Suppose instead the company issued shares, current ratio fell, and asset turnover declined. Those three points become 0, producing 6, even if the issuance funded a high-return acquisition. The decomposition is more informative than calling 6 simply “good” or “bad.”

Reconstruction and review checklist

Section titled “Reconstruction and review checklist”
  • Download both annual filings and align fiscal year length, currency, continuing operations, and acquisition or disposition effects.
  • Preserve raw values, formulas, denominators, comparison signs, and the reason for each binary result.
  • Reconcile CFO to net income and inspect receivables, inventory, payables, deferred revenue, factoring, and supplier finance.
  • Reconcile debt changes to borrowing, repayment, current reclassification, foreign exchange, leases, and business combinations.
  • Review equity statements and financing cash flows rather than inferring issuance only from diluted EPS shares.
  • Separate organic margin and turnover changes from acquisitions, divestitures, impairments, inflation, and commodity prices.
  • Use annual periods for the classic framework; if using TTM, compare with a like TTM and label the modification.
  • Treat banks, insurers, funds, and many REITs cautiously because gross margin, current ratio, and industrial leverage definitions may not fit.
  • Pair the score with valuation, debt maturities, governance, business quality, and forward-looking risks.

Binary thresholds discard magnitude. ROA of 0.01% and 20% both earn one point; a tiny current-ratio improvement can offset serious deterioration elsewhere in the simple total. Mergers, accounting changes, restatements, and missing fields can also create false precision.

Common misconceptions

Section titled “Common misconceptions”
  • “A score of 9 guarantees outperformance.” The original result was a historical portfolio finding under specified sample and implementation conditions.
  • “A low score means imminent bankruptcy.” It records nine signals, not default probability.
  • “Higher is always better for every industry.” Several inputs do not transfer cleanly to financial firms or special structures.
  • “All websites calculate the same score.” Data mapping and denominator choices can differ.
  • “No increase in diluted shares proves no equity issuance.” Weighted-average shares reflect many events and timing effects.
  • “CFO above net income proves clean earnings.” Working-capital timing and classification can temporarily raise CFO.
Section titled “Related topics”

Authoritative sources

Section titled “Authoritative sources”