We found CNTN4 deletions enriched in both the ADHD cohort with deletions in 134 cases and 17 controls (P = 3.99 × 10−21; OR = 7.14) and the NDD cohort with deletions in 175 cases and 43 controls (7.58 × 10−17; OR = 3.62). Here, CNTN4 is linked to Neurodevelopmental delay.