Trade book publishing is dominated by the “Big 5”: five book publishing companies that own or partner with over 100 different publishers and imprints, and who are responsible for the lion’s share of books that you see on shelves. As such, it can get confusing as to which imprint (like Tor Teen) is owned by which publisher (Tor/Forge Books) is owned by which “Big 5” company (Macmillan).
Designer and author Ali Almossawi recently collected this information into an easy online info chart, allowing curious folks to quickly identify imprints and publishers owned by the same “Big 5” company. This is publicly available information, but it can be difficult to track down in some cases. Almossawi’s chart greatly simplifies that information.
It should be noted that not all publishers are included in the chart, just the ones that are considered the five most prominent. (Harry Potter publisher Scholastic Books, for example, is not included.) So the chart should not be considered a complete representation of the book publishing industry. Nevertheless, it’s an extremely handy collection.