
Amazon has a dominant share, with around 67% of e-book sales (51% from the Website and 16% using an app). Barnes & Noble has a 12% share, and Apple’s iBooks store has an 8% share.
One interesting trend reported by the BISG is that there’s an increase in the people that buy print and digital versions of a book interchangeably, and a decline in the number of people that exclusively buy e-books.