eBooks accounted for 12% of Penguin’s revenues according to the publisher’s latest trading results.
In a statement the company said “eBook sales doubled” in 2011 “and accounted for 12% of Penguin revenues worldwide and over 20% of sales in the US.”
Penguin has also announced that more than 50million ebooks and apps have been downloaded since 2008.
Across all formats, the publisher amassed sales of £1,062m and operating profit of £113m last year.
Despite the collapse of several retailers and tough trading conditions, Penguin says it saw growth in its three largest markets, the US, UK and Australia.
Chairman and CEO John Makinson, said: “This is the most turbulent book market that anyone can remember. In spite of this, we have increased both our sales and our profits.
“This remarkable achievement has been driven by excellent publishing around the globe, demonstrated by market share growth in our three biggest markets, and innovation in every aspect of our digital publishing.”