Companies should not be allowed to have secret ownership; I don't give a shit if this data is leaked. Corporations are a legal fiction, and so they have no right to or expectation of privacy, like there should be for persons with e.g. individual tax records.

The basic operation of markets depends on having as little information asymmetry as possible between opposite sides of a transaction, and part of that means knowing who you're doing business with to make informed decisions about the reputation of your counterparty.