The “Big 5” is the nickname for the top five largest trade publishers that own practically every publishing imprint in the United States. These publishers dominate the book publishing industry, accounting for the majority of the hardcover and paperback books available in bookstores, estimated to be about 90% of the market. They are responsible for celebrity authors becoming household names.
Informative! HarperCollins runs Oracle JD Edwards and I did some software work for them as a Contractor when I worked for Syntax.