Marvel Comics was December's top publisher, with a 37.89% dollar share and a 45.60% unit share. DC was second, at 33.55% and 31.35% respectively. In third, Image Comics had a 5.91% dollar share and a 5.93% unit share, followed by IDW Publishing, BOOM! Studios, Dark Horse Comics, and Dynamite Entertainment.
In addition to Doomsday Clock #12, DC had five titles in the top ten. Scott Snyder and Greg Capullo's Batman: Last Knight on Earth #3, the finale of their Black Label series, ranked #3; Frank Miller and Rafael Granpá's Dark Knight Returns: The Golden Child one-shot ranked #4; Harley Quinn: Villain of the Year #1 ranked #5; and Brian Michael Bendis, Ivan Reis, and Joe Prado's Superman #18, the landmark issue in which Superman reveals his secret identity to the world, ranked #10.
Marvel Comics also had five titles in the top ten. Jonathan Hickman, Leinil Francis Yu, and Gerry Alanguilan's X-Men #3 ranked #2, Donny Cates and Mark Bagley's Venom #21, the first chapter of "Venom Island," ranked #5; Peter David and Greg Land's Symbiote Spider-Man; Alien Reality #1 ranked #8; Incoming #1, the all-star one-shot that sets the stage for 2020, ranked #8; and Nick Spencer and Oscar Bazaldua's Amazing Spider-Man #35 ranked #9.
Among the premier publishers, IDW Publishing's Teenage Mutant Ninja Turtles #100 was the publisher's top book at #17; Mighty Morphin Power Rangers/Teenage Mutant Ninja Turtles #1 from BOOM! Studios ranked #29; Todd McFarlane and Jason Shawn Alexander's Spawn #303 was Image Comics' top book at #45; and Dynamite Entertainment's Vampirella #6 ranked #61 for the month.
Marvel Comics' House of X/Powers of X, a hardcover collection of the two mini-series by Jonathan Hickman, Pepe Larraz, and R.B. Silva that heralded a revitalization of Marvel's mutant franchise, was the best-selling graphic novel of December and one of the publisher's four titles among the top ten. DC's Batman Volume 11: The Fall and the Fallen by Tom King and Mikel Janin led DC's slate of three titles in top ten at #2. Jeff Lemire, Dean Ormston, and Rich Tommasco's Black Hammer Volume 4: Age of Doom Part 2 from Dark Horse Comics ranked #5, and Garth Ennis and Darick Robertson's The Boys Omnibus Volume 6 from Dynamite Entertainment ranked #6.
Zenescope Entertainment's Grimm Fairy Tales Adult Coloring Book Volume 1 was December's best-selling book.
Data for Diamond’s sales charts — which includes the monthly market shares and all top product charts — are compiled by Diamond Comic Distributors from sales made to thousands of comic book specialty shops located in North America and around the world. Additional sales made to online merchants and other specialty retailers may be included as well.
Unit and dollar market shares are calculated based upon orders for comic books, graphic novels, and magazines invoiced and shipped to Diamond customers during any given month, which comprises pre-orders, advance reorders, and reorders, minus any copies that are received back from a title marked as returnable. Please note that comics marked with an asterisk (*) have had their reported quantities reduced due to retailer returnability, and thus may rank lower on the charts than their actual sales would reflect.
The New Titles Count Chart includes all titles that were invoiced by Diamond to retailers for the first time during the month and is not the official solicited title count for the month. Variant edition comic books and graphic novels at the same price point count as a single SKU. Variant edition comic books, lenticular covers, digital combo packs, and graphic novels at different price points count as separate SKUs for each edition.