William O'Neil built his method — published in How to Make Money in Stocks (1988, repeatedly revised) — on a research idea that was radical for its time: profile the greatest winning stocks in market history before their big moves, and extract what they had in common. The answer came in two halves: what the chart looked like (a specific base pattern) and what the company looked like (accelerating earnings, something new, institutional buying). Everything in this module is paraphrase of his framework; the book and its breakdowns are the source.
The base: a cup, then a handle
His signature pattern, in paraphrase: after an advance, a stock corrects and rounds out a long, U-shaped cup over a number of weeks — not a sharp V, which suggests nothing was actually digested. As price returns near the old high, it drifts down once more in a shallow, brief handle, typically on shrinking volume — the last impatient holders leaving. The buy point (his pivot) sits just above the handle's high. Depth, duration, and where the handle forms all matter in his spec — a handle that droops too deep, or forms in the lower half of the cup, marks a base that isn't ready.
Look at what the shape actually encodes and you'll recognize the whole course so far: the cup rim is an old high (Livermore's pressure point), the handle is a final tight range (a small Darvas box), and the pivot is a breakout with a defined failure level. What O'Neil added is the demand for structure quality — not every old high deserves a trade, only ones approached the right way.
Volume: the confirmation rule
The breakout, in his framework, must arrive on volume well above the stock's average — his studies put big-winner breakout days at large multiples of normal turnover. A pivot cleared on quiet volume is suspect: prices can drift through a level, but institutions can't hide, and it's institutional accumulation that fuels a real Stage-2-style advance. Volume is the auction's polygraph — the same "acceptance" logic the Market Profile course applies intraday, at daily scale.
The other half: CAN SLIM®
O'Neil refused to separate the chart from the company. His CAN SLIM® checklist (a registered trademark of Investor's Business Daily; each letter is a criterion) demands, in paraphrase: current and annual earnings growth, something genuinely new (product, management, price high), reasonable supply of shares, leadership confirmed by relative strength, institutional sponsorship, and a market in a confirmed uptrend. That last item is Weinstein's stage filter wearing different clothes — O'Neil's research attributed most of a stock's move to the general market's direction, so the checklist simply forbids buying breakouts into a downtrending market.
And the exit rule that made the whole thing survivable, again in paraphrase: cut every loss at a small fixed percentage below the buy point — famously in the 7–8% region — without exception or debate. He framed it as insurance: the small loss is the premium; the avoided Stage 4 ride is the payout.
Caveats in plain sight
The pattern was extracted from winners — stocks that failed from identical-looking bases don't appear in a hall-of-fame study, so the raw pattern's base rate is unknowable from the book alone (survivorship bias; Module 8 returns to this). The specific growth thresholds reflect decades of revisions and IBD's own data products. Treat the framework as a coherent, testable checklist — its parts (breakout + volume + RS + market filter + hard stop) each have independent support — rather than a certified probability.
Assignment
Find one stock within a few percent of its 52-week high (any free screener can do this). Examine its last base: was the correction a rounded U or a sharp V? Did a handle form, and where? What did volume do on the days it approached the high? Write a three-line verdict in your journal: base quality, volume verdict, and the exact pivot price — whether or not you'd ever trade it.