CYLOR, especially as this is a relatively modern question that I don't think is agreed upon by all of the contemporary poskim.
I believe that most poskim are of the opinion that a limited liability corporation is not prohibited from charging interest, no matter how many Jewish shareholders there are. This is the opinion of R. Menashe Klein (Mishnah Halakhos 6:277), R. Zalman Nechemiah Goldberg (heard from someone who heard it directly), R. Zvi Pesach Frank (Sheelos UTeshuvos Y.D. 126, see also Zeraim 2:43), R. Shternbach (I assume, based on what he says regarding chametz on Pesach in Moadim UZmanim 1:54), and Rav Asher Weiss (Sh"t 1:105-106)
On the other hand, the Minchas Yitzchak (1:3, 4:1) says that corporations with any Jewish shareholders are subject to Jewish laws, but probably not biblically, and this appears to also be the view of R. Yitzchak Ahron Ettinger (Shut Mahari Halevi 2:124). Maharshag (Shut Y.D. 3) goes even further, and says that all of the shareholders are no worse than partners in ownership, and therefore all the laws of ownership - including Biblical prohibitions - would apply, even if there's only one Jewish shareholder.
Some might say that there's a difference if the Jew is merely a shareholder, or a controlling shareholder in that he would have a say in how the corporation's business is run. This may be the opinion of R. Moshe (Igros Moshe Y.D. II:63) but I'm not so sure