From a 2009 news post -
"Joel Eisenberg and Timothy Owens’ EMO Films has formed a specialty division, EC Film, Radio and Television, Ltd., in association with rights-holder William M. Gaines Agent, Inc., to exploit the notorious EC comics library in all related media platforms. Titles included in the deal are “Tales From the Crypt” (based on the original works, as opposed to the HBO intellectual property version), “Vault of Horror,” “Haunt of Fear,” “Weird Fantasy,” “Shock SuspenStories,” “Two-Fisted Tales” and the remaining horror, science fiction, crime, humor and dramatic library, with the exception of “Mad Magazine,” presently owned by Time-Warner."
So the answer would be publisher's estate, William M. Gaines Agent, Inc. (As of 10/30/2009).