Question: what are the big publishing houses?
Answer: The big 5 are, of course, Hachette, HarperCollins, Macmillan, Penguin Random House and Simon & Schuster. These companies are often seen as emblematic of the state of traditional trade book publishing in the United States. If we slot Macmillan in at 5%, that's over 80% of the U.S. trade publishing pie.