William J. O'Neil
Portfolio
How position sizing, concentration, and risk fit the style.
Holdings and trading positions
William J. O'Neil ran private trading accounts and an investment research business rather than a continuously disclosed public fund. His portfolio changed with earnings leadership and market conditions, so there is no reliable complete current or lifetime holdings list.
Documented holdings and position types
Syntex: O'Neil's early investment in the pharmaceutical growth company became the best-documented major winner associated with his career and helped him purchase a New York Stock Exchange seat.
Leading earnings-growth stocks: Portfolios focused on companies producing strong quarterly and annual earnings and sales growth, usually while their industries also showed leadership.
New-product and new-high candidates: O'Neil bought stocks emerging from constructive price bases as a new product, management change, or industry development attracted institutional demand.
Cash: When the general market weakened and breakouts failed, the portfolio could move substantially to cash instead of remaining fully invested.
Model-book companies: O'Neil's historical studies include many great stock-market winners, but a company appearing in a model book is not proof that he personally owned it.
Evidence caveat
Many online lists confuse Investor's Business Daily watchlists, CAN SLIM screens, institutional filings for unrelated managers, and O'Neil's own trades. Except for well-documented examples such as Syntex, exact names, weights, and holding periods should not be invented.
How to read this list
This page distinguishes verified holdings from the eligible universe. Syntex can be studied in Best Investments; CAN SLIM selection and sell rules belong in Decision Framework.