AIQF Daily digest — 9 new papers

Quant Paper Radar · 4 of 9

1. 1

   Enhancing Numerical Stability in Portfolio Optimization via Numerical Rank: The $$\delta $$-Stable Part of the Efficient Frontier

   Claudia Fassino, Pierpaolo Uberti · OPENALEX · Portfolio Optimization

   we backtested it — Sharpe 0.66 · quant relevance 0.96

   The paper restricts mean-variance portfolio targets to a numerically stable segment of the efficient frontier. It reports an out-of-sample comparison of risk-adjusted returns after transaction costs, alongside evidence on allocation stability.

   original paper

2. 2

   Robust enhanced index tracking portfolio selection under distributional uncertainty

   Jun Cai, Zhiqiao Song · ARXIV · Enhanced index tracking / robust portfolio optimization

   we backtested it — Sharpe 0.70 · quant relevance 0.98

   The paper proposes distributionally robust portfolios designed to outperform a benchmark while limiting downside risk relative to it. It reports improved out-of-sample wealth and risk-adjusted performance on real market data.

   original paper

3. 3

   Pockets of predictability: a stochastic crowding model and finite-sample regime detection for the endogenous decay of trading anomalies

   Sajad Ahmad Sheikh, Dilawar Ahmad Bhat · OPENALEX · Regime-conditioned momentum

   we backtested it — Sharpe 0.33 · quant relevance 0.90

   The paper develops a theoretical model of anomaly crowding and a rolling-covariance detector for deciding when to trade a predictive signal. Its performance results come from model simulations, not a backtest on market data.

   original paper

The rest of the batch

• Agent Policy-Value Audit: Separating Transition Composition from Event Selection in Financial LLM Agents

  Mingyang, Chen, Yida et al. · ARXIV · relevance 0.93

  The paper proposes a matched-randomization audit to distinguish an earnings-trading agent’s event-selection skill from returns attributable to its mix of position changes.

and 5 more · see the full radar