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William O’Neil is a legendary American stockbroker, entrepreneur, and author. He pioneered the use of computerized analysis of historical stock performance to predict current market trends. He has also written several books on successful stock market strategies.

William O’Neil was born in Oklahoma in 1933 and raised in Texas. He attended Southern Methodist University, where he received a bachelor’s degree in business. After serving in the United States Air Force, he began his career as a stockbroker at Hayden, Stone, & Company in 1953.

While working there, O’Neil became fascinated with what make stocks in the securities market successful. As he proceeded to research this topic, he studied eight different market cycles, and eventually identified seven basic factors that all top-performing companies had in common. O’Neil then developed CAN SLIM, an investment strategy that took into account not just fundamental and technical analysis, but also the historical trends and patterns of stocks. He went on to computerize this form of market analysis technique.

William O’Neil quickly became the top-performing broker in his firm, increasing his own account over 2000% in a little over two years. In 1963, O’Neil branched out and founded his own investment company, William O’Neil + Co., Inc. O’Neil also purchased a seat on the New York Stock Exchange (at the age of thirty, he was the youngest person at that time to ever do so). His company continued their groundbreaking work in computerized securities databases, and today currently tracks over 40,000 data items from over 10,000 companies dating back to 1880.

William O’Neil quickly determined that his company’s success depended on their ability to deliver time-sensitive information to their clients ahead of the competition. Consequently, in 1973 he founded O’Neil Data Systems, Inc (often referred to by the initials ODS), a high-speed printing company. Utilizing state-of-the-art computer technology, ODS developed one of the first database publishing systems. OSD specialized in printing time-sensitive publications for a variety of companies in a variety of fields.

In 1984, O’Neil make research from his database available in print. He began publication of “Investor’s Daily” (later renamed “Investors Business Daily” in 1991), the first business newspaper to successfully compete with the “The Wall Street Journal”. “Investors Business Daily” filled the daily information gap between the business community and investors. By 1994, ten years after its first issue, “Investors Business Daily” had a paid circulation of 149,557 with an estimated total readership between 850,000 and 1,000,000 people.

A man of many talents, William O’Neil has also written ten highly successful books on stock market investing over the years. In one of his earliest books, “The Model Book of Greatest Stock Market Winners”, William O’Neil explains the CAN SLIM investment strategy he developed. One of his later books, ” How To Make Money In Stocks—A Winning System In Good Times Or Bad”, was the best selling investment book of 1988, and is still available in print. His 2000 book, “24 Essential Lessons For Investment Success”, and his 2004 book, ” The Successful Investor” have also become famous.

Today, William O’Neil is on the lecture circuit, explaining to sold-out audiences of institutional and individual investors his tactics for finding winning stocks and minimizing losses in trading. His company, William O’Neil + Co., remains a national investment information management and brokerage firm that exclusively specializes in providing data for the institutional investment community.