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William O’Neil

A READING GUIDE · Growth & market leadership

William O’Neil developed CAN SLIM, a growth-stock framework combining business results and market behavior. MarketSmith’s explanation emphasizes current and annual earnings, new developments, supply and demand, leadership, institutional sponsorship, and market direction.

The connection to FIRE

Our FIRE connection: if you research individual companies, write down both the business evidence and the conditions under which you would exit. A household’s long-term objective does not remove the need to define the purpose of each position.

The useful tension

Earnings growth is not the same as an earnings surprise. CAN SLIM and post-earnings drift ask related but distinct questions. A famous framework cannot establish your likely return, and an active approach demands time and judgment.

Am I buying a durable business, a particular setup, or a story I have not tested?

Start with the source

Take the idea into your own plan.

An independent reading guide by FireFolio, published September 25, 2026. These are our FIRE connections, not a claim that the writer supports every idea in the movement. No affiliation or endorsement. Educational material, not individualized investment advice.