This study aims to (1) analyze the influence of the principal’s leadership style on the performance of student cooperative managers at SMP Negeri 21 Makassar; (2) assess the influence of organizational culture; (3) examine the impact of teacher commitment; (4) analyze the simultaneous effect of leadership style, organizational culture, and teacher commitment; and (5) identify the most dominant influencing variable. This quantitative research involved 45 student cooperative managers from grades VII–IX using a saturated sampling technique. Data were collected through questionnaires and analyzed using multiple regression, t-test, and F-test with SPSS 26. Results show that leadership style, organizational culture, and teacher commitment have a significant positive partial and simultaneous effect. Teacher commitment is the most dominant variable influencing cooperative management performance.
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