In this thesis, we leverage Edgar Schein’s (1992) organizational culture framework alongside multimodal discourse analysis to identify textual and visual cues that reveal CEOs’ organizational culture mindsets. We analyze 72 LinkedIn posts from Swedish unicorn startup CEOs in 2022-2023 to explore whether the scholarly assumptions about organizational culture mindsets of successful startup leaders will be reflected in our analysis. Our findings indicate that our developed novel analytical framework effectively identifies how CEOs’ LinkedIn communication reveals their innovation, growth-oriented, visionary, equality, hierarchical and appreciation mindsets. We also discover inconsistencies between text and image communication in our data. By making the process of how CEOs implement various textual and visual tools to construct their posts explicit, we help CEOs and their stakeholders gain a better understanding of the effects of these choices and the implicit meanings that are created in this process. Finally, we open the door for further research on organizational culture mindsets that are revealed through CEO communication, contributing a new dimension to research on CEO communication on social media.