Quality#97tier 1live in productionNew

beneish m score short

cadence: Quarterlydata: lowshort onlylong short
paper
1999
Source
#96 beneish_m_score_short — Beneish 1999 FAJ 8-variable earnings-manipulation index.
Citation only — paper link pending.

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.

No production champion data for this family yet. Stats appear once the discovery pipeline promotes at least one strategy with this family tag.

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_quarterly

    Quarterly 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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