Thomson financial ownership databases: Mutual Fund Holdings (s12): Includes Type 1: Fund Characteristics Type 2: Stock Characteristics, Type 3: Stock Holdings, Type 4: Change in Holdings. Available through WRDS.
Inter-Corporate Ownership: The Inter-corporate ownership (61-517-XCB) directory is the most authoritative and comprehensive source of information available on corporate ownership, a unique directory of "who owns what" in Canada. It tracks the ownership of the largest Canadian corporations and provides up-to-date information reflecting recent corporate takeovers and other substantial changes.