William O'Neil – The Art of Stock Selection
In The Art of Stock Selection, Jack Schwager interviews William O'Neil, the founder of Investor's Business Daily and the creator of the CAN SLIM investing methodology. Unlike many investors who rely solely on value investing or technical analysis, O'Neil combines fundamental strength with price action. His philosophy is built on the belief that the biggest stock market winners share certain characteristics long before they become household names. By identifying these traits early, investors can significantly improve their chances of finding exceptional growth stocks.
One of O'Neil's most important lessons is that great companies usually demonstrate outstanding earnings growth before their stock prices make major advances. Rather than searching for stocks that appear cheap based on traditional valuation measures, he focuses on businesses that consistently report strong quarterly and annual earnings increases. Rapid growth in profits often reflects a company with an innovative product, increasing market share, or a strong competitive advantage.
According to O'Neil, institutional investors such as mutual funds and pension funds are naturally attracted to companies delivering exceptional financial performance. As these large investors accumulate shares, demand increases, which can drive stock prices significantly higher over time. For this reason, earnings growth serves as one of the strongest indicators of future market leadership.
Another central idea in the chapter is that price and volume reveal what informed investors are doing. O'Neil believes that charts should never be ignored because they reflect the collective actions of millions of market participants. When a stock rises on unusually high trading volume, it often suggests that institutional investors are actively buying shares. Conversely, heavy selling volume may indicate that professional investors are reducing their positions.
Rather than treating charts as prediction tools, O'Neil uses them to confirm whether strong fundamentals are being recognized by the market. A company with excellent earnings but weak price action deserves caution, while strong fundamentals combined with positive price and volume behavior often represent higher-quality opportunities.
O'Neil also emphasizes the importance of buying market leaders instead of laggards. Many beginners are tempted to purchase stocks that have already declined significantly because they appear inexpensive. O'Neil argues that low prices alone rarely indicate good value. In many cases, weak stocks continue underperforming because the underlying business is also weakening.
Instead, he encourages investors to focus on companies already demonstrating leadership within their industries. Market leaders often possess superior products, stronger management teams, and faster earnings growth than their competitors. Although these stocks may appear expensive, they frequently continue outperforming because their businesses continue improving.
Risk management plays an equally important role in O'Neil's strategy. One of his best-known rules is to sell quickly when a loss reaches approximately 7–8 percent below the purchase price. He believes that accepting small losses prevents them from becoming devastating ones. Even the most carefully researched investments sometimes fail, and protecting capital allows investors to participate in future opportunities.
Many investors hesitate to sell because they hope prices will eventually recover. O'Neil warns that this emotional attachment often transforms manageable losses into much larger financial setbacks. Successful investors recognize mistakes early and move on without allowing pride to influence their decisions.
Another valuable lesson is the importance of studying historical market winners. O'Neil spent years analyzing the greatest-performing stocks in market history to identify common characteristics before their major advances. He discovered that successful companies repeatedly exhibited similar patterns of earnings growth, sales expansion, institutional buying, and constructive chart formations.
This historical research became the foundation of the CAN SLIM methodology. Rather than relying on opinions or predictions, O'Neil encourages investors to learn directly from previous market leaders and apply those lessons to identifying future opportunities.
The chapter also highlights the importance of aligning investments with the overall market trend. Even outstanding companies can struggle during broad market declines because negative sentiment affects most stocks. O'Neil therefore advises investors to monitor the general direction of the market before increasing exposure. When the broader market enters a strong uptrend, high-quality growth stocks have a greater probability of producing exceptional returns. Conversely, during bear markets, preserving capital becomes the higher priority.
Ultimately, William O'Neil – The Art of Stock Selection teaches that successful stock investing is a combination of strong business fundamentals, disciplined chart analysis, effective risk management, and continuous research. Rather than chasing low-priced stocks or relying on opinions, O'Neil encourages investors to focus on exceptional companies with proven earnings growth, institutional support, and positive price momentum. His approach reinforces one of the recurring themes throughout Market Wizards: consistent success comes from following a structured process, managing risk carefully, and letting objective evidence guide every investment decision.