October 2018 marked the second time in two years that publishers saw modest revenue growth in eBooks (+4.4%), with increases for the format across all trade book categories. Aside from downloaded audio, eBooks had the largest percent of revenue growth for the month, compared to October 2017.
Publishers’ revenues (sales to bookstores, wholesalers, direct to consumer, online retailers, etc.) were $1.16 billion in October 2018, down from $1.17 billion in 2017 (-0.8%). The trade book categories either remained flat or declined in October, while educational and scholarly publishing saw some revenue increases.
For the year to date (Jan. – Oct.), revenue for trade publishers was up by $213.8 million (+3.5%). Despite the gains in trade publishing, overall publisher revenue was down by $87.2 million (-0.7%) for all tracked categories (Trade, PreK-12 Instructional Materials, Higher Education Course Materials, Professional Publishing, and University Presses).
more detail at source: http://newsroom.publishers.org/publisher-revenue-for-ebooks-increased-in-october/