Theses are all the significant comic book publishers/companies I have discovered.
After Hours Press, LLC.
BOOM! Studios
Seven Seas Entertainment
Radical Publishing
Evil Ink Comics
Neko Press Comics
eigoMANGA
DGN Production/DrMaster Publications Inc.
Com.x Comics
Bluewater Productions
Arch Enemy, Entertainment
ASPEN COMICS
Archaia Entertainment
Antarctic Press
Viper Comics
Radio Comix
Penny-Farthing Press
Alternative Comics
Del Rey Manga
Valiant Comics
Fluid Comics
Gestalt Comics
LAMP POST
Moonstone Books
Oni Press
Red 5 Comics
Titan Books
UDON Entertainment
Liquid Comics
Legendary Comics
IDW Publishing
Zenescope
Dark Horse
DC Comics
Marvel Comics
Image Comics
SLG Publishing
Top Shelf Productions
Devil's Due
KaBOOM! Studios
Chaos! Comics
BOOM! Studios
Seven Seas Entertainment
Radical Publishing
Evil Ink Comics
Neko Press Comics
eigoMANGA
DGN Production/DrMaster Publications Inc.
Com.x Comics
Bluewater Productions
Arch Enemy, Entertainment
ASPEN COMICS
Archaia Entertainment
Antarctic Press
Viper Comics
Radio Comix
Penny-Farthing Press
Alternative Comics
Del Rey Manga
Valiant Comics
Fluid Comics
Gestalt Comics
LAMP POST
Moonstone Books
Oni Press
Red 5 Comics
Titan Books
UDON Entertainment
Liquid Comics
Legendary Comics
IDW Publishing
Zenescope
Dark Horse
DC Comics
Marvel Comics
Image Comics
SLG Publishing
Top Shelf Productions
Devil's Due
KaBOOM! Studios
Chaos! Comics