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How to Make Money in Stocks summary: O'Neil's CAN SLIM, explained honestly

The title promises a lot. The useful part of the book is quieter: a written checklist, a chart shape to wait for, and a hard rule for getting out.

Beginner guide · 6-minute read · Updated 2026-10-21

The book in one line

How to Make Money in Stocks is by William J. O'Neil, the founder of the newspaper Investor's Business Daily. It was first published in 1988 and has been updated in several editions since.

It lays out his stock-picking method, called CAN SLIM. It mixes company facts (like earnings growth) with chart reading.

A word on the title: it's the book's name, not a promise from us. No book or method can promise that. We'll focus on the parts that teach a process.

The 5 ideas worth keeping

1. Use a written checklist: CAN SLIM

Each letter is one thing O'Neil wants to see before he buys:

• C — strong recent (current) earnings growth
• A — strong annual earnings growth over several years
• N — something new: a product, a leader, a fresh price high
• S — supply and demand: how many shares exist and how much they're traded
• L — a leader in its group, not a laggard
• I — interest from big institutions, like funds
• M — the overall market direction

You don't have to agree with every letter. The lesson is that he wrote his rules down and checked each one every time. That's what turns a hunch into a process.

2. The market's direction matters most

O'Neil puts a lot of weight on that last letter, M. If the overall market is falling, he argues, even good stocks tend to fall with it.

It's the same idea we teach on charts: check the bigger picture first, then trade with it. Our guide to multiple timeframe analysis shows the chart version.

3. Wait for a base, then a breakout

O'Neil studied charts of big past winners and found they often paused in a sideways "base" before a large move. His best-known base is the cup with handle: a rounded dip, a recovery, then a small drift down before price pushes higher.

We cover the shape in our cup and handle guide. The honest part: the pattern often fails. That's exactly why his next rule exists.

4. Cut every loss at a fixed point

O'Neil's sell rule is famous and strict. In the book, he says to sell any stock that falls about 7–8% below what you paid, with no exceptions and no hoping.

You may use a different number, or a stop set from the chart instead. The core idea stands: decide your maximum loss before you buy, and obey it. See how to set a stop-loss for a chart-based version.

5. Volume tells you how serious a move is

O'Neil wants to see trading Volume jump when price breaks out of a base. More shares changing hands suggests real buying, not a quiet drift.

It's a useful second check, though not a guarantee. Our guide on how to read volume explains what to look for.

How to use it as a beginner

The book is long and packed with numbers. Use it to learn how a complete method is built: a checklist to find ideas, a chart shape for timing, and a firm exit rule.

Try this:

1. Write your own 5-line checklist, inspired by CAN SLIM but using only things you can check today.
2. Add a fixed exit rule, such as "my stop goes below the last turning point".
3. Open a past chart in bar replay, find a base, and practise your entry and exit without peeking ahead.

Log each practice trade in units of risk. After 20, you'll see how often the shape worked and how often your exit rule saved you.

Who it's for, and who should skip it

It's for you if you like rule-based methods and want to see how company facts and charts can work together.

Skip it (for now) if you want something short and gentle. It's dense, and the earnings sections assume some comfort with company reports.

Read it with…

• One Up on Wall Street: a lighter take on studying companies.
• Technical Analysis of the Financial Markets: the reference book for the chart side of things.

Questions