If they are publicly traded companies you would likely have found it on the SEC website via the EDGAR database.
In all likelihood, the companies are privately held and not required to submit accounts to public record. Finding detailed information on private companies requires jumping through hoops. Even finding out the registered address can be tricky and you have to know the state they are in. In Michigan, you’d go to the michigan.gov website and spend ages until you found this link: this link where you get some details, but only the name, address, date of incorporation etc.
What are the companies or is this secret squirrel?