Bankruptcies announce themselves in the balance sheet long before the share price shows it: the Z-score condenses five ratios into a default probability.
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Every stock runs through the same disclosed rules. The points add up to a score, traceable down to the individual rule.
Each rule checks a metric against a threshold, for example ROE above 15 %.
You decide how much each rule counts: from +1 to +3 or −1 to −3.
The sum is the score. Above the upper threshold: a high match with the profile.
These terms describe only the match with the criteria, not a recommendation to buy or sell.
The Z-score translates five balance-sheet ratios into a 24-month default probability.
Above 2.99 counts as safe (+3), 1.81 to 2.99 as the grey zone (+1), below that acute danger looms (−3).
Retained earnings weigh heavily: pure hope stocks without history fall through.
Financials run on balance-sheet leverage by design; they are classified neutrally instead of wrongly punished.
For risk-aware investors as a pre-filter before any other strategy: before valuation or growth matter, survival should be secured. Particularly valuable for small caps and optically cheap stocks whose low price may reflect default risk.
The Z-score was developed by Edward Altman in 1968 and remains the best-known bankruptcy prediction model: a discriminant analysis condenses five balance-sheet ratios (working capital, retained earnings, operating earnings power, market value versus liabilities and asset turnover) into a single figure for the default risk of the next 24 months. Above 2.99 the safe zone begins, below 1.81 the distress zone with acute bankruptcy risk. The model punishes young companies without an earnings history hard: exactly what makes it an excellent filter against hype stocks without substance. For banks and insurers the metric is structurally not applicable; they are classified neutrally.
The Z-score weights five ratios: working capital to total assets (liquidity), retained earnings to total assets (accumulated substance), EBIT to total assets (earnings power), market capitalisation to total liabilities (market buffer) and sales to total assets (asset turnover). A value above 2.99 signals the safe zone (+3), 1.81 to 2.99 the grey zone (+1), below 1.81 the distress zone (−3).
The thresholds are deliberately identical for all size classes: a high bankruptcy risk is as unacceptable for a large cap as for a small cap (risk metric, universal). Financials and stocks without a computable Z-score park at +1 in the middle zone: not assessed is not the same as risky.
Z-score > 2.99: safe zone, default risk statistically low (+3).
Z-score 1.81–2.99: grey zone, moderate warning level, heightened attention (+1).
Z-score < 1.81: distress zone, acute bankruptcy risk within 24 months (−3).
Financial or Z-score not computable: neutral middle classification (+1).
The strength: the Z-score is purely balance-sheet based and thus immune to story and sentiment; in studies it flagged a large share of bankruptcies one to two years in advance. As a gatekeeper before value strategies it prevents the classic mistake of buying a "cheap" company whose price simply reflects its default risk.
Documented refinement: the grey zone earns +1 instead of 0 points here so it becomes visible as a middle classification; in the original point system it would be indistinguishable from the lower zone. Limits: the model was calibrated for industrial companies; for service businesses with lean balance sheets it is conservatively biased, and for financials it is not defined at all (hence their neutral treatment).
For anyone wanting to systematically sort out default risks, as a standalone screen or as a risk gate flanking other strategies (the StockScorer Score uses exactly this gate as a knockout).