Background Traditional banks monopolized financial services, but the 2008 crisis spurred Fintech's emergence as an alternative. Fintech challenges banks with innovative solutions, while Sweden thrives as a Fintech hub. Profitability is vital due to the recent shift in focus from growth. Modern Fintech research is lacking, thus creating gaps in both knowledge and studies among the Swedish Fintech-sphere.  Purpose  The study analyzes leverage, return on equity, and bank size ratios in Swedish Fintech companies. It examines their impact on profit margin and aims to identify correlations. The results aim to enhance understanding and provide guidance for optimizing key figures to increase profitability among Swedish Fintech-companies.  Methodology The study utilized a quantitative approach with a deductive method and cross-sectional design. Data consisted of secondary data and was collected through the database Retriever Business. A total of 1198 observations were analyzed using correlation matrix, bivariate, and multivariate regression analyses.  Results  The quantitative analysis revealed that both debt to equity ratio and return on equity has a significant relationship, while bank size has only a partially significant relationship with profit margin.  Conclusion  Swedish Fintech-companies reveals a positive relationship between return on equity (ROE) and profitability. Furthermore, the leverage ratio also positively affects profitability. Moreover, Bank size shows a slight negative impact.