When to Sell: Inside Strategies for Stock Market Profits

By Justin Mamis

Quick Summary

Justin Mamis addresses the most neglected aspect of investing: knowing when to sell. The book provides a framework for making sell decisions based on technical analysis, market psychology, and practical experience as a market professional. Mamis argues that the inability to sell at the right time is the primary cause of investment underperformance and provides tools for overcoming the psychological barriers to taking profits and cutting losses.

Executive Summary

"When to Sell" tackles what Mamis identifies as the single most important yet least discussed skill in investing: the sell decision. Justin Mamis, a veteran Wall Street professional, argues that most investors focus obsessively on what and when to buy while giving almost no systematic thought to when to sell. The result is that good buy decisions are routinely undermined by poor sell decisions -- either holding too long and watching profits evaporate, or selling too early and missing major moves. The book provides a comprehensive framework for systematic sell decision-making.

Core Thesis

The sell decision is more psychologically difficult than the buy decision because selling forces the investor to confront the finality of a choice and the possibility of being wrong. Most investors fail not because they cannot identify good stocks but because they cannot manage the exit process. A systematic approach to selling, based on technical signals and predetermined criteria, is essential for consistent profitability.

Key Concepts and Terminology

• The Sell Discipline: A systematic framework for making sell decisions based on predetermined criteria rather than emotions
• Protective Stops: Predetermined price levels at which positions are exited to limit losses
• Trailing Stops: Stop levels that move up as a stock advances, protecting accumulated profits
• Technical Deterioration: The progressive weakening of a stock's technical picture that precedes major declines

Practical Applications

1. Establish sell criteria before entering any position
2. Use technical signals such as trend breaks and moving average violations as objective sell triggers
3. Implement trailing stops to protect profits while allowing winners to run
4. Recognize the psychological biases that prevent timely selling (hope, greed, fear of regret)
5. Develop a systematic review process for all holdings

Critical Assessment

Note: This PDF contained garbled text and could not be fully extracted. The summary is based on available content and the book's well-known reputation. Mamis provides practical wisdom on a topic most trading books neglect. The book's age means some market references are dated, but the psychological insights about selling remain timeless.

Conclusion

"When to Sell" fills a critical gap in investment literature by focusing exclusively on the sell decision. Its insights into the psychology of selling and its practical framework for systematic exit strategies make it valuable reading for any investor or trader struggling with the timing of exits.