Who is allowed to see my corporation's individuals-with-significant-control register?

The individuals-with-significant-control register isn't a public document in Ontario — it's kept privately by the corporation, typically alongside its other corporate records, rather than filed with or made searchable through a government registry. That distinguishes it from a general public database that anyone could search online.

Access is instead limited to specific categories of people and purposes. Ontario's Business Corporations Act generally permits certain government bodies with an investigative or regulatory role, along with law enforcement, to request the register in connection with their legitimate functions. Shareholders and creditors of the corporation can also generally request access, though typically subject to restrictions meant to prevent the information from being used for purposes unrelated to the corporation's affairs, such as being passed on for marketing or unrelated commercial use.

The general public, competitors, or other outside parties don't have a right to see the register simply by asking. If your corporation receives a request to see its ISC register, it's worth confirming that the person or body asking actually falls into one of the categories entitled to access before providing it, rather than assuming any request must be honoured.