NIHD - This news actually has nothing to do with NII Holdings. It is announcing that this guy bought 50% stake in one of NII's competitors.
Read this paragraph.
Iusacell competes in the Mexican mobile market with Telcel, the unit of billionaire Carlos Slim's America Movil which has about a 70% market share, with Spain's Telefónica, which has around 20% of the market, and with the Mexican unit of NII Holdings Inc.
It doesn't even mention NII Holdings market share because it is miniscule.