Key Takeaways
- • Alpha Architect's Jose Ordonez tests Asness, Moskowitz, and Pedersen's 2013 paper "Value and Momentum Everywhere" out of sample from July 2013 to July 2026, and finds clear post-publication return decay across factor portfolios.
- • The "everywhere" long/short portfolio fell from a 5.58% pre-publication average annual return (Sharpe 1.25) to 0.48% (Sharpe 0.20) after publication, per the hypothetical paper-portfolio analysis.
- • In U.S. long/short factor portfolios, value returned -39.99% cumulatively after publication while momentum returned 84.68%, leaving the 50/50 combination up 14.92%.
- • In the long-only U.S. 50/50 combination, CAPM alpha fell from a statistically significant 3.03% pre-publication to an insignificant -0.66% post-publication, and the combination's max drawdown versus the market reached 27.21%.
- • The author argues the decay is not necessarily fatal: value and momentum remain negatively correlated, cross-asset correlations have risen, and the post-2020 recovery is attributed to a risk-based interpretation, though the author explicitly declines to forecast future premia.
Summary
The "everywhere" long/short portfolio averaged 5.58% annually with 4.48% volatility before publication, a 1.25 Sharpe ratio. Afterward, it averaged 0.48% with 2.36% volatility, a 0.20 Sharpe. Across global stock selection, pre-publication returns averaged 6.34% a year (1.18 Sharpe), falling to 2.11% (0.44 Sharpe) afterward. In the U.S., pre-publication returns averaged 5.94% (0.84 Sharpe), compared with 1.22% (0.21 Sharpe) afterward. In each long/short set, value lagged sharply, with the U.S. value leg down 39.99% cumulatively, while momentum offset much of the damage. The author notes that the weakness was most pronounced in the 2018-2020 "quant winter."
In the long-only U.S. analysis, a 50/50 value and momentum portfolio's CAPM alpha dropped from 3.03% (t=5.55) before publication to -0.66% (t=-0.44) after. The combination compounded at 12.50% against the market's 14.24%, with momentum at 15.42% and value at 9.16%. The combination's maximum drawdown relative to the market was 27.21%, from a July 2014 peak to an October 2025 trough, compared with 8.47% in the pre-publication sample.
The author states that the data add to the evidence of post-publication decay but does not answer whether positive factor premia can be expected going forward. Three arguments are offered. First, the post-2020 global stock selection Sharpe of 0.71 is closer to the pre-publication level, though the author cautions that the start date was chosen and the average return is not statistically significant (t=1.40). Second, the paper's core findings still hold for combinations: value and momentum remain negatively correlated within all eight asset classes (-0.43 to -0.67 after publication), and average pairwise cross-asset correlations rose to 0.27 for value and 0.33 for momentum from 0.16 and 0.23. However, seven of 16 individual strategies had negative average returns after publication, and the long/short combination results are not statistically significant given 139 and 157 monthly observations. Third, the author suggests value's underperformance may reflect a risk that investors are paid to bear over time, a hypothesis the post does not test, with the U.S. valuation gap between cheap and expensive stocks widening to near-record levels.
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