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. The participants included 792 students from sixth and seventh years of Primary Education (Meanage = 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. 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. 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.