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This study examines the influence of SME performance, knowledge sharing, work motivation, and the work ethic of SME proprietors. This research was conducted on Small and Medium Enterprises in East Java. The study population comprised 293 proprietors of small and medium-sized enterprises (SMEs) employing between 3 and 10 individuals. The participants in the study were owners of small and medium enterprises situated across East Java. Data collection for each variable was performed using questionnaires. Data analysis methodologies utilize descriptive analysis techniques and quantitative data analysis techniques, such as Structural Equation Modeling (SEM) with Partial Least Squares (PLS). The results demonstrated that the mediating effect of work ethics on the relationship between work motivation and company performance was insignificant. The mediating effect of work ethics on the relationship between work motivation and knowledge sharing was substantial. The correlation between work motivation, work ethics, and knowledge sharing was positive and significant; however, the influence of motivation on company performance was not significant. The motivation of employees negatively affects the performance of small and medium-sized enterprises (SMEs) in East Java. This study offers guidance to managers of small and medium enterprises on implementing work ethics to enhance employee motivation, performance, and knowledge sharing.