Mich. Comp. Laws § 450.1444

Sec. 444. (1) Shares standing in the name of another domestic or foreign corporation, whether or not the corporation is subject to this act, may be voted by an officer or agent, or by proxy appointed by an officer or agent or by some other person, who by action of its board or pursuant to its bylaws, shall be appointed to vote the shares. (2) A shareholder whose shares are pledged is entitled to vote the shares until they have been transferred into the name of the pledgee, or a nominee of the pledgee.