When you look at share holders of said corporation does it only list you? Every last share must be held by you and it should move from the 'Enterprise Controlled Public Corporations' to 'Privately Held Corprations'.
Also, ONE entity, be it country or CEO should own all shares. Having a 33, 33, 34 split between a two CEOs and a country does not mean it's wholly owned as the game treats each separately from the rest, except for levels where the combined effort is used. So either one CEO/Country owns all shares.
Cheers!