Founded in 1963 by investment legend William J. O'Neil, the company pioneered the use of historical stock market data and computational analysis in equity research. It is renowned for its proprietary O'Neil Methodology (OM) and the CAN SLIM® Investing System. The firm provides independent, unbiased equity research, data, and consulting services to the world's leading institutional money managers, including pension funds, mutual funds, and hedge funds. In October 2023, William O'Neil + Co. was acquired by Datasite, a leading SaaS provider for the M&A industry.

Founded in

United States