27 C.F.R. § 1.42
In the event of any change in the ownership, management, or control of any business operated pursuant to a basic permit (if the permittee is a corporation, if any change occurs in the officers, directors, or persons owning or controlling more than 10 percent of the voting stock of said corporation) the permittee shall immediately notify the appropriate TTB officer of such change, giving the names and addresses of all new persons participating in the ownership, management, or control of such business, or in the case of a corporation, the names and addresses of such new officers, directors, or persons owning or controlling more than 10 percent of the voting stock. Notice to the appropriate TTB officer of any such change shall be accompanied or supplemented by such data in reference to the personal or business history of such persons as the appropriate TTB officer may require.
27 C.F.R. § 1.42