The six jurors concluded Thursday that Cinemark, the nation's third-largest movie theater chain, couldn't have prevented James Holmes' meticulously planned attack.
Several survivors and families of the dead had sued the suburban Denver theater, saying it lacked armed guards during the crowded midnight premiere of a Batman movie. There also was no silent alarm that would have sounded when Holmes slipped into an auditorium and started shooting.
They say Cinemark should have foreseen the possibility of violence at the summer blockbuster.
Cinemark attorneys said guards weren't needed at a theater with no history of serious violence.