"Controlling interest" means the ownership of outstanding voting shares of an issuing corporation sufficient, but for the provisions of NRS 78.378 to 78.3793, inclusive, to enable the acquiring person, directly or indirectly and individually or in association with others, to exercise:
1. One-fifth or more but less than one-third;
2. One-third or more but less than a majority; or
3. A majority or more,
of all the voting power of the corporation in the election of directors.
(Added to NRS by 1987, 756)