Executive functions (EFs) correlate positively with many developmental outcomes, and ecologically valid measures of EFs may be more predictive of some outcomes than performance-based measures. Accordingly, there is a need to evaluate short EF rating scales, such as the Behavior Rating Inventory of Executive Function-2nd Edition Screener, Teacher Report (BRIEF2-TS). Data from 1,322 kindergarten children in Singapore (50% girls; 61.3% Chinese, 10.6% Malay, 16.3% Indian, 4.0% other ethnicity, and 7.8% did not report their ethnicity), followed for 3 years, were used to examine the multilevel factor structure, gender and longitudinal invariance, reliability, and concurrent and predictive validity of BRIEF2-TS scores. Results indicated a two-factor within-level structure (11 items; cognitive and emotional-behavioral regulation) that was at least partially invariant across gender and time. Concurrent validity with direct EF measures and ratings of self-regulation, and predictive validity for socioemotional and academic skills were good. Overall, BRIEF2-TS scores showed evidence for good validity and reliability. Future research should consider correlates of the between-level structure and further consider structure and validity in clinical samples. (PsycInfo Database Record (c) 2023 APA, all rights reserved).