The Corporate Transparency Act, of course, does not focus on ownership but on control.  You can have zero percent ownership and still be required to report.  25% ownership is considered enough evidence of control, to trigger reporting but is the percentage of ownership ever requested?  (I haven't got that far.)  And owners of businesses that meet the "20 employees and $5 million revenue" standard are not required to report. 

Thanks for the link to the article about oral arguments, although it doesn't even identify where they were held.  And it names only two of the judges -- both of them Harvard Law, Trump appointees.  One of them was also on the panel that reversed Judge Burke on the transgender case.