S&P Global Market Intelligence offers full ownership coverage of over 49,000 current and historical public and private companies tied to over 36,000 investment firms, 48,000 mutual funds, and 324,000 insiders/individual owners, with history back to 2004. In addition, the data set includes insider holdings/trading and short sellers’ interest, as well as additional analytics such as investor type and investor style. The dataset also describes activist investors, with history for 20-30 of the most active organizations in the space.