High Quality Content by WIKIPEDIA articles! LexCorp (originally styled, Lexcorp) is the fictional company founded by Lex Luthor in the popular DC Comics Superman series. It made its first proper appearance in John Byrne`s The Man of Steel miniseries, which established the post-Crisis Superman setting. However it had previously been referred to some months before the Crisis in an Elliot S! Maggin story set in a future New York City, where the Silver Age Luthor establishes it after he is reformed.