William O'Neil founded Investor's Business Daily and developed CANSLIM — a seven-factor growth-stock system that has influenced more successful traders than almost any other methodology.
For educational purposes only. This article describes a publicly documented investment methodology. Nothing here is investment advice. Trading involves substantial risk of loss.
William O'Neil (1933–2023) founded Investor's Business Daily in 1984 and spent decades studying what the biggest stock winners had in common before their major moves. He analysed every major winning stock from 1880 to the present and distilled the common patterns into a seven-factor framework: CANSLIM.
CANSLIM has become one of the most widely used frameworks among active growth investors. Mark Minervini has described it as a major influence. Many of the characteristics it describes are directly visible in the Trading Awareness dashboard.
The C in CANSLIM stands for Current quarterly earnings per share — growth of at least 25% vs. the same quarter a year ago. O'Neil found that the biggest winning stocks almost always showed large earnings accelerations in the one to three quarters before their major moves.
He looked specifically for acceleration: not just 25% growth, but 25% and growing — each quarter's growth rate higher than the previous. A stock growing earnings at 30%, 45%, 60% is exhibiting the kind of acceleration that attracts institutional interest.
Annual earnings must show a meaningful uptrend over the past three years — at least 25% annual growth, with each year higher than the last. This filters out companies with one good quarter but no underlying trend. O'Neil wanted to see sustained, compounding growth, not a one-time event.
The N factor is the catalyst. O'Neil found that every great stock move was driven by something new: a new product (iPhone), a new service (cloud computing), a new management team turning around a struggling company, or a new regulatory environment opening a market. Without a catalyst, earnings acceleration tends to be temporary.
This is the factor that links CANSLIM to Paul Tudor Jones's emphasis on narrative and Kristjan Kullamägi's episodic pivots — the story has to have a reason to be true, not just the numbers.
O'Neil used floating share count and volume to understand the supply/demand dynamic. He preferred smaller floats — fewer shares outstanding — because institutional buying has a more dramatic effect on the stock price when there aren't billions of shares to absorb. A stock with 20 million shares reacts much more to $100 million of buying than one with 2 billion shares.
On the demand side, he wanted to see volume surging on up days and contracting on down days — the classic signature of institutional accumulation.
CANSLIM only buys leaders. O'Neil developed the Relative Strength (RS) Rating — a percentile rank of each stock's 12-month price performance vs. all other stocks. He only bought stocks with an RS Rating of 80 or above, meaning they were outperforming at least 80% of all stocks.
His observation: the best-performing stocks typically enter their biggest moves already showing superior relative strength. If a stock is lagging the market, it's absorbing selling pressure that leaders don't have. The Trading Awareness Leaders tab surfaces exactly this — stocks with high RS scores that have already demonstrated they can outperform the market.
A stock needs fuel to make a major move, and that fuel is institutional buying — mutual funds, pension funds, hedge funds. O'Neil looked for stocks with an increasing number of quality institutional owners. Too little ownership means there's no sustained buying pressure; too much means the stock is widely held and the easy money is already made.
Volume surges on up days, large-gap-up earnings reactions, and stocks repeatedly returning to strong levels after mild pullbacks are all signs of institutional accumulation.
The M is arguably the most important letter. O'Neil was emphatic: three out of four stocks follow the market direction. No matter how strong a CANSLIM stock's fundamentals are, it will struggle in a downtrending market. He required a clear confirmation that the market was in an uptrend before committing capital to new positions.
His primary market signal was what he called a follow-through day: after a market decline, the first big-volume up day on a major index (typically day 4 or later off the low) that confirms a new rally attempt is underway. Without a follow-through, he stayed mostly in cash.
The Trading Awareness Breadth tab's Market Tone and 4%+ ratio directly captures this — when the tone is Risk-On and the breadth is expanding, it's the CANSLIM environment where entries have the highest odds.
Track market breadth, sector rotation, and leadership scores across 12,000+ US stocks — start your 14-day free trial, no credit card required.
Try it free →No credit card required · Cancel anytime