Book Summary
How to Make Money in Stocks is the distilled wisdom of William J. O’Neil, founder of Investor’s Business Daily, who spent years studying the greatest winning stocks in market history to find out what they had in common before they made their big moves. The result is CAN SLIM, a seven-part checklist for identifying growth stocks on the verge of major advances: Current quarterly earnings accelerating, Annual earnings growth over several years, New products or management driving change, Supply and demand favoring the stock (limited share supply, institutional accumulation), Leader rather than laggard in its industry, Institutional sponsorship building, and Market direction confirming the trend. Each letter is backed by O’Neil’s historical research into how the market’s biggest winners actually behaved.
The book is really two books in one. The first half is the buying system: what to look for in a company’s fundamentals and, crucially, in its chart. O’Neil is famous for marrying growth fundamentals to technical analysis — he wants accelerating earnings and a proper base pattern (the “cup with handle” is his signature setup) before he’ll touch a stock. The second half is the selling system, which many readers find even more valuable: rules for when to take profits and, more importantly, when to cut losses. His iron rule is to sell any stock that falls 7 to 8 percent below your purchase price, no exceptions, no second-guessing — because the math of drawdowns means small losses are survivable and large ones are not.
How to Make Money in Stocks also devotes significant space to market timing at the index level. O’Neil argues that three out of four stocks follow the general market’s direction, so knowing when the market is in a confirmed uptrend — his “follow-through day” concept — matters more than picking the perfect stock in a downtrend. The fourth edition (2009) added material on the 2008 bear market and on newer chart patterns, but the core system is unchanged from the original 1988 text. It’s a demanding, rules-based approach written for investors willing to do real homework, and it remains one of the most complete growth-investing manuals ever published.
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Who is William J. O’Neil?
William J. O’Neil (1933–2023) was a stockbroker-turned-investor who founded Investor’s Business Daily in 1984 after developing the CAN SLIM methodology through his own market research. Starting as a broker in the late 1950s, he became one of the top-performing brokers at his firm by focusing on growth stocks, and he later used his data vendor business to fund IBD, a newspaper built around the same principles taught in How to Make Money in Stocks: earnings momentum, relative price strength, and institutional sponsorship. O’Neil’s credibility rests on a simple claim — that his system was reverse-engineered from the actual characteristics of history’s biggest stock market winners, not from theory — and generations of growth investors have treated the book as their primary textbook. His firm also built MarketSmith, the charting platform many CAN SLIM practitioners still use.
Lessons From How to Make Money in Stocks
The most practical lesson is the loss-cutting discipline. O’Neil’s 7-to-8-percent stop rule sounds mechanical, but the logic is arithmetic: a 7 percent loss needs an 8 percent gain to recover; a 40 percent loss needs 67 percent. Most individual investors do the opposite of what works — they sell winners quickly to “lock in gains” and hold losers hoping for a rebound. O’Neil’s system inverts both instincts: cut every loss short, and let winners run until the chart or fundamentals tell you the move is over. Even if you adopt nothing else from the book, this single discipline would improve most investors’ results, because avoiding catastrophic losses matters more than finding home runs.
The second lesson is that the best stocks share observable traits before they run. O’Neil’s research found that big winners typically had strong and accelerating earnings growth, something genuinely new (a product, a market, a management team), and tight share supply with institutions quietly accumulating — all visible in public data before the explosive move. This is an empowering claim: you don’t need inside information or a Bloomberg terminal; you need to know what to look for. The CAN SLIM letters are essentially a filter that narrows thousands of stocks to a watchlist of dozens, which is why the system appeals to investors who want a process rather than tips.
The third lesson is about leadership and relative strength. O’Neil insists on buying the leaders in strong industry groups, not the laggards that “look cheap.” This runs directly counter to bargain-hunting instincts, and it’s where many value-oriented readers will push back — but the historical record he presents is hard to dismiss: the stocks that led the market’s biggest advances were usually already showing exceptional relative strength before their largest gains. Buying strength rather than weakness is psychologically uncomfortable, which is precisely why, in O’Neil’s telling, it works.
A fourth lesson is the market-direction overlay. Because most stocks move with the general market, O’Neil teaches investors to read the indexes for distribution (heavy selling) and follow-through (confirmed buying) days and to scale exposure accordingly — aggressive in confirmed uptrends, defensive or in cash in downtrends. Whether or not you believe in precise timing signals, the underlying point is sound and underappreciated: position sizing should respond to market conditions, and sitting in cash during a bear market is a legitimate strategy, not a failure. The book’s treatment of the 2000–2002 and 2008 bear markets as case studies makes this concrete rather than theoretical.
A fifth lesson worth pulling out is how O’Neil handles winners — the pyramiding and profit-taking rules that most readers underrate. Once a stock advances 20 to 25 percent from its proper buy point, he advises taking at least partial profits, because the historical pattern is that big winners often pull back to test their breakout. But for the rare stock that keeps running — the true market leader — he teaches adding to the position on sound follow-up buy points rather than treating the initial purchase as the whole position. The underlying principle is concentration with feedback: bet bigger only on positions the market is validating, and never average down on losers. It’s the mechanical version of “water the flowers, pull the weeds,” and it forces a discipline most investors lack, which is adding to strength instead of catching falling knives.Buy How to Make Money in Stocks on Amazon
Criticisms of the Book
The biggest criticism of How to Make Money in Stocks is that the system is extremely demanding to execute. CAN SLIM done properly requires daily chart review, earnings-calendar tracking, and the emotional discipline to cut losses at 7 percent and sit in cash when the market turns — which is effectively a part-time job. The high turnover also means meaningful transaction costs and, in taxable accounts, a constant stream of short-term capital gains. For most people with day jobs, the realistic version of this book is “read it, adopt the sell discipline, and ignore the rest,” which is fine, but it’s not the system as advertised.
There’s also a selection-bias question hanging over the research. O’Neil studied history’s greatest winners and extracted their common traits — but studying winners alone can’t tell you how many stocks shared those traits and then went nowhere. The base rate matters: if thousands of stocks show accelerating earnings and strong charts and only a handful become ten-baggers, then the traits are necessary but not sufficient, and the system’s edge is smaller than the winner-focused presentation suggests. O’Neil’s followers would counter that the sell rules handle the false positives, which is fair, but it means the system’s real engine is loss control, not stock selection.
Style-regime risk is a third concern. CAN SLIM is a growth-and-momentum system, and growth/momentum can underperform value for years at a time — the 2000–2008 stretch was brutal for exactly this style. A practitioner following the rules would have spent much of that period in cash, which the system allows, but that requires a level of discipline most people don’t have, and the whipsaw risk is real: strict stop-losses in choppy markets generate a death-by-a-thousand-cuts sequence of small losses. The book presents the system as style-agnostic; in practice it has a strong growth tilt that investors should understand before committing.
A related critique concerns the chart patterns themselves. Identifying a “cup with handle” or a proper buy point in real time is more subjective than the book’s annotated historical charts suggest — hindsight makes every pattern look obvious. Two reasonable practitioners can look at the same chart and disagree about whether a base is sound, which means the system’s results depend heavily on the practitioner’s pattern-recognition skill, a tacit ability the book can describe but not fully transfer. The rules help, but they don’t eliminate judgment, and beginners consistently underestimate how long that judgment takes to develop.Finally, there’s the commercial context. O’Neil built a publishing and data business around CAN SLIM — the newspaper, the charting tools, the seminars — and skeptics note that the book functions partly as the top of that funnel. That doesn’t make the ideas wrong, but it means the success stories associated with the system are curated by an organization with a financial interest in the system’s reputation. Treat the testimonials the way you’d treat any marketing material: as illustrations, not evidence.
Who is This Book For?
How to Make Money in Stocks is for the active investor who wants a complete, rules-based system for growth stocks and is willing to put in the hours. If you enjoy researching companies, reading charts, and managing positions — and you have the temperament to sell at a small loss without flinching — this is the most thorough manual for that style ever written. It’s also surprisingly valuable for investors who will never run CAN SLIM: the chapters on selling, loss-cutting, and market direction contain lessons that transfer to any active strategy.
It’s not for passive investors, and it’s not for anyone looking for a low-maintenance approach — an index fund will serve those readers better with far less effort. Beginners should also be warned: the system looks simple on paper and is genuinely hard in practice, because every rule that matters (cut losses, don’t buy laggards, sit out bad markets) fights your instincts.
One group that gets surprising value from How to Make Money in Stocks: investors who run mostly passive portfolios but keep a small “explore” sleeve for individual stocks. The book’s sell discipline and market-direction rules are excellent guardrails for a satellite portfolio — they cap the damage that stock-picking can do to an otherwise sensible plan. You don’t have to become a CAN SLIM practitioner to benefit from its risk management; you just have to respect the stop-loss. Read it to understand growth investing deeply; adopt it only if you’re prepared to treat it like a craft.
Final Thoughts
How to Make Money in Stocks is the rare investing book that tells you exactly what to do — buy this kind of stock, in this kind of pattern, in this kind of market, and sell when any of it breaks down. Whether CAN SLIM beats the market net of costs and taxes is debated, but the book’s core insights are durable: big winners rhyme, losses must be cut mechanically, and fighting the market’s trend is a losing game. Even skeptics of the full system tend to quietly adopt the 7-percent rule. Read it as a masterclass in growth-stock discipline rather than a guaranteed formula, and you’ll get your money’s worth several times over.
