The growth of Penguin’s eBook business was revealed this week as the publisher announced its results for the first half of 2011.
Acorss all product types sales were £457m with operating profit standing at £42m.
Penguin Chairman and CEO John Makinson, said: “The past six months have represented a watershed for book publishers and book retailers alike. The rapid penetration of digital devices and content, coupled with the severe pressure on physical booksellers, have presented the whole industry with unprecedented challenges.
“I am delighted that, thanks to the quality of its publishing, Penguin has been able to maintain its sales and further strengthen its margins during these turbulent times.”
Penguin says it will continue to invest in digital content including apps.