Purpose: This study intends to propose and test an inclusive framework of shared leadership, internal marketing, internal communication, thriving, and project success. Design/Methodology: Using an online survey tool, the study collected time-lagged data from 256 employees of four insurance companies. The subjects were selected using a convenience sampling technique. The theorized relations were examined using structural equation modeling in AMOS. Findings: All the theorized relationships were supported except the direct effects of internal communication and project success. In addition, thriving and project success were not found to be significant, and the mediation of thriving between shared leadership and project success was not supported. When leadership is shared among group members, it is more likely that projects will be successful. Originality: The study contributes supplementary insights to project management and leadership literature. Scholars in this domain will benefit from these findings and develop better models for projects.