In the late 1970s up to the early 1990s, Marvel Entertainment Group (MEG) sold options to studios to produce films based on Marvel Comics characters. One of Marvel's superheroes, Spider-Man, was optioned in the late 1970s, and rights reverted to Marvel without a film having been produced within the allotted timeframe. From 1986 to 1996, most of Marvel's major characters had been optioned, including the Fantastic Four, X-Men, Daredevil, Hulk, Silver Surfer, and Iron Man. A Howard the Duck film made it to the screen in 1986, but was a box-office flop. MEG was purchased by New World Entertainment in November 1986 and moved to produce films based on the Marvel characters. It released The Punisher (1989) before MEG was sold to Ronald Perelman's Andrews Group. Two other films were produced: Captain America (1990) released in the United Kingdom on screens and direct to video in the United States, and The Fantastic Four (1994), not intended for release. Marvel's rival DC Comics, on the other hand, had success licensing its properties Superman and Batman into successful film franchises.

Is it true that does marvel own the rights to fantastic four?
yes