Nook From Barnes & Noble Gains More E-Book Readers

Barnes & Noble said that sales of Nook devices during the nine weeks that ended Dec. 31 grew 70 percent compared with the same period a year earlier.

I.H.S. iSuppli, a research company, estimates that Barnes & Noble has 13 percent of the e-reader market after two years in the business, versus 67 percent for Amazon. The company tracked shipments of display parts to prepare its estimates. The Kindle is likely to be hard to vanquish, said Ben Arnold, a director of industry analysis at the NPD Group, a market research firm. “The Kindle has become such a strong brand of e-readers, it’s almost synonymous to when you talk about Kleenex when you talk about tissues,” he said. At some point the dedicated e-reader market is likely to start shrinking in light of the proliferation of more versatile color tablets, analysts say.