The proprietor must notify TTB of any changes in the list of stockholders or persons with interest that was filed with TTB as required by § 19.93(b). If the change results in a change of control, the proprietor must file form TTB F 5110.25, Application for Operating Permit Under 26 U.S.C. 5171(d), within 30 days of the change. If the change does not cause a change in control the proprietor:
(a) May file a letterhead notice to amend the operating permit;
(b) May file the amended notice the May 1st following the change in control year rather than within 30 days of the change, or on any other date that the appropriate TTB Officer may approve; and
(c) Must incorporate all changes submitted by letterhead notice in the next TTB F 5110.25 filed.