DC Comics
Originally known as "National Publications", DC is a publisher of comic books featuring iconic characters and teams such as Superman, Batman, Wonder Woman, Green Lantern, the Justice League of America, and the Teen Titans, and is considered the originator of the American superhero genre. DC, along with rival Marvel Comics, is one of the "big two" American comic book publishers. DC Entertainment is a subsidiary of Warner Brothers and its parent company Warner Media.
Marvel
Formerly known by names including "Atlas" and "Timely", Marvel Entertainment is the publisher of comic books featuring iconic characters and teams such as the Fantastic Four, Spider-Man, the Avengers, the X-Men, Iron Man, the Hulk, Thor, Captain America and Daredevil. Currently owned by the Walt Disney Company, Marvel is one of the "Big Two" comic publishers along with DC Comics.
Valiant/Acclaim
Valiant Comics began as an imprint of Voyager Communications, established in 1989 in part by former Marvel editor-in-chief Jim Shooter. It was discontinued in 1996 after being bought out by Acclaim Entertainment. After Acclaim closed its doors in 2004, the properties were revived as Valiant Entertainment and has been publishing new material since May 2012.
Virgin Comics
A comic book publishing company created under Richard Branson's famous brand, Virgin Comics LLP has subsequently been bought-out by Liquid Comics. Virgin Comics LLP featured stories from a wide variety of international movie creators, writers & directors, and was notable for many stories based in India.