If the term is understood in a purely legal, regulatory sense, privatization is "achieved" when the government share of ownership falls from 50 % + 1 to 50 % -1.
如果單以法規定義來解讀，國營事業的官方持股從百分之五十多一股（股權過半），到百分之五十少一股（股權不過半），就算完成了民營化作業。