Diamond Comic Distributors, Inc. (often called Diamond Comics, DCD, or casually Diamond) is the largest comic book distributor serving retailers in North America and worldwide. They transport comic books from both big and small comic book publishers, or suppliers, to retailers. Diamond dominates the direct market in the United States, and has exclusive arrangements with most major U.S. comic book publishers, including Dark Horse Comics, DC Comics, IDW Publishing, Image Comics, Marvel Comics, and more.