This pilot study (N = 25) compared the effects of a short, four‐month version of Responsive Aggression Regulation Therapy Outpatient (Re‐ART Compact) and the entire, ten‐month intervention (Re‐ART Complete) on specific executive functioning (EF) and the risk of violent recidivism in adolescents and young adults (13–23 years). Re‐ART is a cognitive behavioral‐based intervention for adolescents and young adults with severe aggression problems. The Re‐ART Compact and Re‐ART Complete groups were comparable on the EF measures inhibition, flexibility, emotion regulation, self‐evaluation, and self‐control, but the Re‐ART Complete group showed more improved risk of violent recidivism. We conclude that Re‐ART Compact can be used as a compact, short intervention for EF, which is a valuable addition to the field of forensic mental health care where many problem behaviors relate to poor EF.