No diamond in the rough, Diamond Comic Distributors is the world's largest distributor of English-language comics books. The company, founded in 1982, also sells graphic novels and related collectibles to comic book stores and bookstores nationwide. Diamond promotes comic book reading by organizing, sponsoring, and supplying Free Comic Book Day when stores give away select comic books to all attendees. Industry mainstays DC Entertainment (Batman), Dark Horse Comics, and Marvel Publishing (Spider-Man) also participate. Diamond president Steve Geppi also owns comic book publisher Gemstone Publishing, publishes Baltimore Magazine, and is an investor in the Baltimore Orioles.