Kobo ereader availabiltiy

Curiously, the first and the third book of the Hunger Games is available from Kobo as an ebook, but not the second. (i'm reading the third on my iPhone, an it will be the second book I've ever read on my iPhone. But Mockingjay is not showing the strength of plot of the Hunger Games.) That could be frustrating for someone. Who was managing those rights?