From Publishers Weekly:
At the end of June, Amazon’s Kindle family of reading devices was used to read e-books by 55% of e-book buyers, according to figures compiled by Bowker Market Research.
Amazon’s share was up from 45% in the second quarter of 2010 and 48% in the second period of 2011, and the increase was aided by the release of the Kindle Fire. Since its introduction in late 2011, the Fire’s share of e-book reading has risen quickly and hit 18% in June. Some of its gains came at the expense of other Kindle devices, but the combination of dedicated e-readers and tablets gave Amazon its highest market share ever, topping the 49% the company had in the fourth quarter of 2010.
Through its iPad and iPhone devices, Apple had a 15% share of e-reading in June, up from 13% in June 2011 with the gain coming entirely from iPads as the use of e-book reading on iPhones fell by two percentage points in the year-to-year period. Barnes & Noble’s Nook devices had a 14% share in the second quarter, a figure that has held steady since the fourth quarter of 2011, but was down from a peak of 22% in the third quarter of 2010.
Link to the rest at Publishers Weekly
Amazon, Apple, Ebook/Ereader Growth, Nook
Source:
http://www.thepassivevoice.com/11/2012/kindle-share-of-e-book-reading-at-55/