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Stocks on the Move: Beating the Market with Hedge Fund Momentum Strategies

by Andreas F. Clenow (2015)

Quick summary -- an in-depth PhD-level extended summary (10-30 pages) for this book is coming soon.

Stocks on the Move: Beating the Market with Hedge Fund Momentum Strategies

Author: Andreas F. Clenow | Categories: Momentum, Quantitative Finance, Trading Systems, Equity Investing

Executive Summary

"Stocks on the Move" by Andreas F. Clenow, published in 2015, presents a complete, systematic equity momentum strategy based on the author's experience as a quantitative hedge fund manager. The book is structured as an extensive research paper, providing a fully disclosed set of rules for managing a momentum stock portfolio that has historically outperformed the S&P 500 significantly. Clenow previously authored "Following the Trend" about futures trend following, and this book applies similar systematic rigor to equity momentum investing.

The core strategy is simple: buy stocks that have been moving up strongly and sell them when they stop. However, the implementation details -- position sizing, rebalancing frequency, universe selection, bear market protection, and dealing with survivorship bias -- are where the real value lies.

Core Thesis & Arguments

Clenow argues that equity momentum is one of the most well-documented and persistent anomalies in financial markets, and that it can be exploited through a systematic, rule-based approach. The central insight is that a stock that has been trending up strongly is more likely to continue trending up than to reverse, and this tendency persists across time periods and markets. The challenge is building a complete system that captures this effect while protecting against bear markets and accounting for the practical realities of managing a large number of positions.

Chapter-by-Chapter Analysis

Chapters 1-3: The Case for Momentum

Establishes momentum as a concept, reviews academic research, and addresses common objections. Explains why institutional momentum strategies differ from naive approaches.

Chapters 4-6: Building the Strategy

Complete rules for stock ranking (using exponential regression), position sizing (based on ATR), entry and exit criteria, rebalancing schedules, and the critical bear market filter using the S&P 500's 200-day moving average.

Chapters 7-9: Simulation Results and Analysis

Detailed backtest results from 1999-2014 with full statistical analysis, including drawdown analysis, year-by-year performance, and comparison to benchmarks.

Chapters 10-12: Practical Implementation

Real-world considerations including brokerage costs, tax implications, data quality, and the tools needed to run the strategy.

Key Concepts & Frameworks

  • Exponential Regression Slope: The ranking method for momentum, using the annualized slope of an exponential regression line fitted to price data.
  • ATR-Based Position Sizing: Normalizing position sizes by Average True Range to equalize risk contribution across holdings.
  • 200-Day Moving Average Bear Filter: Only buying new positions when the S&P 500 is above its 200-day moving average.
  • Rebalancing Discipline: Weekly or bi-weekly rebalancing to maintain the portfolio's momentum exposure.
  • Survivorship Bias: The critical importance of using point-in-time index membership data to avoid inflating backtest results.

Practical Trading Applications

  1. Rank S&P 500 stocks by exponential regression slope to identify the strongest momentum stocks.
  2. Size positions using ATR to equalize volatility contribution.
  3. Only enter new positions when the market index is above its 200-day moving average.
  4. Exit positions that drop out of the top momentum rankings or fall below their own moving average.
  5. Rebalance regularly and avoid emotional attachment to individual positions.

Critical Assessment

Strengths: Completely transparent strategy with full rules disclosed. Rigorous backtesting methodology with proper handling of survivorship bias. Practical and implementable. Honest about limitations and risks.

Weaknesses: Momentum strategies can experience sharp drawdowns, especially during momentum crashes. Past performance may not persist in future. Requires significant infrastructure for proper implementation.

Best for: Quantitative-minded investors who want a systematic, evidence-based approach to equity investing with a fully disclosed methodology.

Key Quotes

"A stock that has been moving up strongly for a while is likely to continue doing so a little bit longer. That's the core idea. The rest is details."

"I'm not revealing anything that hurts me or my business. A trading methodology like this doesn't work that way."

Conclusion & Recommendation

"Stocks on the Move" is a refreshingly honest and completely transparent guide to systematic equity momentum investing. Clenow provides everything needed to implement the strategy, from ranking methodology to position sizing to bear market protection. The book's greatest strength is its integrity -- the strategy is fully disclosed, the backtesting is rigorous, and the limitations are honestly presented.