I am currently managing a lawsuit against a private company, let's call it "X". It's an Israeli company. I need to prove to the court that company X is actually a subsidiary of company Y, which is a public company in the United States. (It's a tech giant actually.)
Is there some kind of report for a public company that would show me that company Y holds shares of company X? Is this information that a public company must disclose, and if so what would that document be called? (I already looked at a bunch of important-looking reports of company Y and couldn't find a mention of company X, but I may have been looking at the wrong ones.)