beneish m score short
What it checks
Eight accounting red flags (sales receivables stretching faster than sales, margin compression, asset-quality drift, leverage jumps, accruals piling up) are combined into a single score. When the score crosses the manipulator threshold and the price chart already agrees, that's a short setup.
Mechanism
Beneish (1999, FAJ) built an 8-variable logistic-style index that flags firms likely to be manipulating earnings (DSRI, GMI, AQI, SGI, DEPI, SGAI, LVGI, TATA). M > -1.78 → manipulator suspect. Beneish-Lee-Nichols 2013 FAJ confirm OOS the score predicts both SEC enforcement actions and forward underperformance. Used inside AQR's quality-minus-junk composite. Short-bias only — long-side from very-negative M is historically noisy.
Signal rule
Beneish 8-component M-score on TTM/YoY fundamentals; short when M > -1.78 (or stricter -1.49) AND own-name 60d downtrend.
Data dependencies
fundamentals_quarterlyQuarterly fundamentals (income, balance, cash-flow) from FMP + SEC.
Expected edge
- Paper alpha
- 76% true-positive on flagged manipulators (1982-1992); 2-5% ann. short alpha OOS
- Paper window
- 1982-1992 (in-sample); 1993-2012 OOS replications
Beneish 1999 in-sample: 76% of manipulators flagged with 17% false-positive; OOS trading returns 2-5% ann. short alpha
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