This study aims to clarify the impact of R&D collaborations on the mobility of inventors employed by R&D-intensive Japanese listed companies. To examine inventor mobility and patenting activities, this study constructed an original dataset using patent data from the IIP patent database, spanning 2005 to 2019. The dataset includes 3,637 exit inventors and 53,674 non-exit inventors. The analysis reveals that engagement in R&D collaborations is associated with increased inventor mobility; higher levels of engagement further enhance the likelihood. Contrary to expectations, the diversity of R&D collaborators does not significantly influence the mobility of inventors involved in R&D collaborations. Additionally, the results indicate inventors with a broad knowledge base are less likely to move than those specializing in specific technological domains.