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Marvel Comics was the leading publisher in Retail Dollar and Unit Market Shares based on total sales of comics, graphic novels and magazines to comic book specialty stores in September 2009, according to Diamond Comic Distributors.

SEPTEMBER MARKET SHARES
Based on Total Unit Sales of Products Invoiced in September 2009

PUBLISHER UNIT SHARE DOLLAR SHARE
MARVEL COMICS 47.58% 40.72%
DC COMICS 32.74% 30.47%
DARK HORSE COMICS 3.72% 5.82%
IMAGE COMICS 2.93% 3.20%
IDW PUBLISHING 2.58% 3.19%
DYNAMITE ENTERTAINMENT 2.11% 2.22%
BOOM! STUDIOS 1.42% 1.52%
ARCHIE COMICS 0.95% 0.63%
VIZ MEDIA 0.62% 1.23%
WIZARD ENTERTAINMENT 0.45% 0.54%
EAGLEMOSS PUBLICATIONS 0.39% 1.73%
BONGO COMICS 0.28% 0.26%
DEVIL'S DUE PUBLISHING 0.28% 0.25%
TOKYOPOP 0.23% 0.60%
AVATAR PRESS 0.22% 0.27%
RANDOM HOUSE 0.22% 0.75%
HARRIS COMICS 0.21% 0.09%
BLUEWATER PRODUCTIONS 0.21% 0.21%
ZENESCOPE ENTERTAINMENT 0.19% 0.26%
ASPEN MLT 0.19% 0.14%
OTHER NON-TOP 20 2.46% 5.89%

This information may not be reproduced in any format without the express permission of Diamond Comic Distributors.

How does Diamond calculate the charts? It all starts at the comic book shop.

Data for Diamond’s sales charts – which include the monthly market shares and all top product charts – are compiled by Diamond Comic Distributors from a universe of over 4,000+ accounts, comprised of comic book specialty shops and other merchant stores and buyers. The shops are primarily located in North America, with a percentage of sales also to international stores and buyers located throughout the world. The account base includes not only brick-and-mortar comic book specialty shops, but also Internet stores, chain stores, and other specialty stores.

Unit and Retail Dollar sales are calculated based upon orders invoiced and shipped to Diamond accounts during any given month, which comprises initial pre-orders, advance reorders, and reorders, minus any copies that are received back from a title marked as returnable.