BACKGROUND: The COVID-19 pandemic triggered a worldwide socio-sanitary crisis, continuing to impact societies worldwide. With many school systems shifted to online education, the current study presents a unique opportunity to investigate relevant phenomena related to serious health issues during the schooling and later in life, cyberbullying and bullying. This study began just before the COVID-19 lockdown was declared and resumed 5 months later allowing to explore 2 main objectives: first, to explore whether cyberbullying increased during the lockdown, and second, to analyze transitions from to time of bullying and cyberbullying. METHODS: The participants included 792 students from sixth and seventh years of Primary Education (Mean[subscript age] = 10.81, SD = 0.85) in Ecuador. This is a quantitative longitudinal study. Cyberbullying and bullying scales were used for data collection before the lockdown in January and February 2020 (T1), and after 5 months of lockdown, at the end of the same academic year in July 2020 (T2). Descriptive, comparative and predictive analyses, a latent transition analysis was used to identify latent status of cyberbullying and bullying behavior at T1 and T2. RESULTS: The results revealed a significant increase of cyberbullying after 5 months of the lockdown. Interestingly, only a small percentage of students who were uninvolved in cyberbullying and bullying in T1 remained uninvolved in T2. CONCLUSIONS: The discussion explores the dynamics of cyberbullying involvement and examines changes in the roles and groups of bullying and cyberbullying after 5 months of lockdown. The political- and school-related implications of these findings are thoroughly discussed.