What Is CAN SLIM?

What it is: CAN SLIM is William O’Neil’s seven-letter checklist for picking high-growth stocks. Each letter is one criterion that must be true before you buy.
Who it’s for: Anyone reading about growth-stock trading, especially in AI-for-trading content.
Best if: You want a clear, plain-English description of the framework most modern growth traders learn first.
Skip if: You already trade CAN SLIM full-time.

CAN SLIM comes from William O’Neil’s 1988 book How to Make Money in Stocks. It’s a seven-step filter for picking growth stocks: each letter stands for one thing that must be true before O’Neil would buy.

The seven letters: C for current quarterly earnings (must be up 25% or more year over year). A for annual earnings (multi-year growth). N for new — new product, new management, or new high price. S for supply and demand (smaller float can move faster). L for leader (own the strongest stock in the strongest sector). I for institutional sponsorship (mutual funds and pension funds buying). M for market direction (only trade when the broad market is in a confirmed uptrend).

CAN SLIM is not a single rule. It’s a complete system that includes rules for when to buy, when to sell, how much to risk, and when to sit out of the market entirely.

Why it matters

Almost every modern growth-stock trader has been influenced by CAN SLIM — including Mark Minervini, David Ryan, Kristjan Kullamägi, and many others. If you read trading content that mentions “flat base,” “cup-with-handle,” or “follow-through day,” that vocabulary comes from O’Neil.

CAN SLIM is also the spine of the AI trading workstation approach — if you’re going to use AI to enforce a methodology, CAN SLIM is the most well-documented one to enforce.

Where you’ll see it

• In Investor’s Business Daily (the publication O’Neil founded) and MarketSmith (its charting product).
• In any post about growth trading, including our stock trading with AI guide.
• In the methodology behind the Beginners in Stock Trading newsletter.
• In Mark Minervini’s SEPA system, which builds on CAN SLIM.

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