• William J. O’Neil (1933–2023) was an investor, stockbroker, data innovator and author best known for creating the CAN SLIM growth‑stock system and founding Investor’s Business Daily (IBD).
– He was an early adopter of computers in equity research, building a computerized daily securities database and producing chart products (Daily Graphs → MarketSmith).
– CAN SLIM is an acronym for seven traits O’Neil used to identify potential high‑growth stocks; his books How to Make Money in Stocks and 24 Essential Lessons codify the method.
– O’Neil’s practical investor advice emphasizes buying leading stocks in leading industries, following the market trend, and strict loss control.
Early Life and Education
– Born March 25, 1933, in Oklahoma City; his formative years were shaped by the Great Depression and Dust Bowl era.
– Studied business at Southern Methodist University (bachelor’s degree, 1955) and served in the U.S. Air Force.
– Early influences led him to value discipline, record‑keeping and data-driven decision making.
The Stockbroker and Data Innovator
– Began as a stockbroker in 1958 with Hayden, Stone & Co. in Los Angeles.
– In 1963 he founded William O’Neil & Co., which developed one of the first computerized daily securities databases, tracking tens of thousands of companies.
– By age 30 he was the youngest person to buy a seat on the New York Stock Exchange (NYSE).
– His database and charting work were intended to give individual investors access to the kind of data institutional investors used.
What Is the CAN SLIM Strategy?
– CAN SLIM is an acronym for seven traits O’Neil believed top growth stocks repeatedly show:
• C — Current quarterly earnings per share (EPS) and sales: recent quarterly results should show strong growth year‑over‑year.
• A — Annual earnings growth: several years of accelerating annual EPS growth.
• N — New: new products, management, a new breakout in technical pattern, or another catalyst that creates fresh investor interest.
• S — Supply and demand: shares outstanding/float and trading volume dynamics; smaller float or a reduction in available shares supports bigger price moves.
• L — Leader or laggard: buy the market leaders (relative strength); avoid laggards.
• I — Institutional sponsorship: increasing ownership by mutual funds, pension funds and other institutions is a positive sign.
• M — Market direction: the overall market must be in a confirmed uptrend (market action matters for individual stock success).
– O’Neil combined fundamental filters (C, A, N) with technical and market measures (S, L, I, M) to find stocks with breakout potential.
Daily Graphs, MarketSmith and Charting
– In 1972 O’Neil started Daily Graphs, a weekly printed book of stock charts for individual investors.
– Charts emphasized clarity and combined technical patterns with fundamental markers—forming the visual foundation of his approach.
– MarketSmith (launched 2010) is the digital evolution of Daily Graphs, integrating the CAN SLIM factors into charting and screening tools.
Investor’s Business Daily (IBD)
– O’Neil launched Investor’s Daily in 1984; the name changed to Investor’s Business Daily (IBD) in 1991.
– IBD provides news, data, proprietary screens, charts and educational content aimed at growth investors.
– In 2021 News Corp agreed to acquire IBD; the publication continues to offer IBD 50, stock lists, ratings and MarketSmith tools to subscribers.
What Is the Main Lesson in How to Make Money in Stocks?
– The principal lesson: buy leading stocks in leading industries during confirmed market uptrends, and strictly limit losses. In practice that means:
• Use data and charts to identify quality growth stocks.
• Wait for a proper technical setup (bases and breakouts) and volume confirmation.
• Cut losses quickly on failures and let winners run with trailing stops.
• Focus on risk management and position sizing to preserve capital.
Who Founded Investor’s Business Daily?
– William J. O’Neil founded Investor’s Daily (later Investor’s Business Daily) in 1984.
Practical Steps — How to Use O’Neil’s CAN SLIM Method (Actionable Workflow)
1. Set up your screening universe
• Use a reliable screener (MarketSmith, IBD.com, or comparable stock screeners).
• Start with growth filters (quarterly EPS growth, annual EPS growth, revenue growth). If you use quantitative thresholds, begin conservatively (e.g., strong recent EPS and revenue growth relative to peers), and adjust as you learn.
2. Apply the CAN SLIM filters (order of importance)
• C & A: Look for accelerating EPS and sales growth (current quarter vs. same quarter last year, and multi‑year annual EPS growth).
• N: Scan for a clear catalyst —new product, management, acquisition, or the company emerging from a technical base.
• L: Rank industry groups; prefer stocks that are leaders (top relative strength within their group).
• S: Check float and insider/institutional ownership trends. A shrinking float or rising institutional sponsorship can amplify moves.
• I: Examine recent 13F data or institutional ownership changes—growing institutional sponsorship is positive.
• M: Confirm overall market health—weekly and daily market indexes should show an uptrend.
3. Use technical setups and chart rules
• Identify bases (cup‑with‑handle, flat base, double bottom) and pivot points.
• Look for breakout on higher‑than‑average volume.
• Use relative strength (RS line) to ensure the stock is outperforming the market.
4. Define entry, stop loss and sizing
• Entry: buy near or slightly above the pivot breakout point with volume confirmation.
• Stop loss: set a stop loss to limit downside (O’Neil advocated cutting losses quickly—commonly 7–8% below your purchase price or below a clear chart support).
• Position sizing: risk a fixed percentage of portfolio per trade (e.g., 1–2% of total capital risked), adjust position size accordingly.
5. Monitor and manage winners and losers
• Move stops up as the stock rises (trailing stops).
• Be alert to distribution days or weakening relative strength—O’Neil recommended selling if a stock begins to lag or shows distribution.
• Trim winners to lock gains when signs of topping appear, or use partial sells to reduce exposure.
6. Build a watchlist and review weekly
• Keep a watchlist of stocks forming bases.
• Review charts and fundamentals weekly; be ready to act when a proper breakout and market trend align.
7. Practice and learn
• Paper trade the system or use small positions while learning.
• Study O’Neil’s published examples and IBD’s education materials to recognize patterns and market behavior.
Risk Management and Limitations
– CAN SLIM is a growth‑oriented, momentum framework; it tends to perform best in bullish markets and may underperform in sideways/bear markets.
– Discipline required: the system relies heavily on cutting losses quickly, which can be psychologically difficult.
– No method guarantees profits; position sizing and diversification are essential.
– Consider combining CAN SLIM principles with your own risk tolerance, tax considerations and time horizon.
Tools and Resources
– MarketSmith (O’Neil’s charting and screening platform)—digital successor to Daily Graphs.
– Investor’s Business Daily (IBD) — news, data, proprietary lists (IBD 50, CAN SLIM screens).
– O’Neil’s books: How to Make Money in Stocks; 24 Essential Lessons for Investment Success.
– Maintain access to up‑to‑date market indexes, volume data and institutional ownership reports.
The Bottom Line
William J. O’Neil left a lasting influence on modern retail investing by combining fundamental growth metrics with technical chart analysis and a strict discipline for loss control. His CAN SLIM framework and charting tools (Daily Graphs → MarketSmith) provide a repeatable approach for identifying high‑momentum growth stocks, while Investor’s Business Daily continues to provide data and education to individual investors. The method requires discipline, attention to market context and sound risk management to work over time.
Sources
– Investopedia, “William J. O’Neil” (Julie Bang).
– Investor’s Business Daily, “Who Was IBD Founder William O’Neil? Learn About The Legendary Investor And CAN SLIM Investing System Creator”
– Investor’s Business Daily, “The CAN SLIM Investing System”
– Investor’s Business Daily, “MarketSmith”
– William O’Neil & Co., “Our 50‑Year Heritage: 1960s” and “Our 50‑Year Heritage: 1980s”
– News Corp, “News Corp Announces Acquisition of Investors Business Daily”
Editor’s note: The following topics are reserved for upcoming updates and will be expanded with detailed examples and datasets.