when a contributing sponsor or a member of a contributing sponsor’s controlled group declares an extraordinary dividend (as defined in
section 1059(c) of title 26) or redeems, in any 12-month period, an aggregate of 10 percent or more of the total combined voting power of all classes of stock entitled to vote, or an aggregate of 10 percent or more of the total value of shares of all classes of stock, of a contributing sponsor and all members of its controlled group;