UPDATE: Data Guy just posted the following:
FWIW, of the 1,417,793 ebooks that have sold 1 or more US copies in the last 6 months:
653,188 had ISBNs
And that’s ebooks from ALL types of publishers, not just indies.
From Publishers Weekly:
A new report issued by Bowker found that a total of 786,935 ISBNs were issued to self-published authors in 2016, an 8.2% increase over 2015.
According to the report, ISBNs for print books rose 11.3% to 638,624 titles, while e-book ISBNs for self-publishers fell 3.2% to 148,311. Since Bowker measures the number of self-published books by ISBN, its count does not include e-books released by authors through Amazon’s KDP program, as they use ASIN identifiers rather than an ISBNs.
The 11% increase in print self-published titles was a slower gain than the 34% increase in 2015 over 2014. While the number of self-published e-books did fall in 2016, the decline was slower than the 11% drop reported in 2015.
“Overall, we believe that these numbers point toward an ongoing maturation and stabilization of the self-publishing industry,” said Beat Barblan, director of identifier services at Bowker.
Amazon’s CreateSpace was by far the largest publisher of self-published print books, releasing 501,043 titles. The output marked an increase of 18.2% over 2015. Lulu was second, publishing 41,907 titles in the year, a decline of 5.1%. Coming in third was Blurb, which released 21,365 self-published titles last year. Author Solutions released 19,270 self-published print titles (through multiple imprints) last year, for a decline of 6.4%.
Link to the rest at Publishers Weekly