Victims of the Colorado cinema massacre have filed a lawsuit accusing theater bosses of negligence.

Gunman James Holmes has been charged with 142 counts, including first-degree murder, after 12 film fans were killed and 58 were injured during a screening of Batman movie The Dark Knight Rises in Aurora, Colorado in July.

Three of the victims have now taken legal action against the owners of the Century 16 multiplex, alleging the theater should have been equipped with an alarm system which could have stopped Holmes allegedly propping open a fire exit to get guns from his car.

They also claim the cinema should have been given heightened security for the midnight screening.

Denise Traynom, Brandon Axelrod and Joshua Nowlan filed federal lawsuits demanding $750,000 each in damages.

The cinema has been closed since the atrocity, but is set to reopen early next year.