This study aims to examine the effect of supplier integration on supply chain performance by moderating supply chain transformational leadership styles. The design used in this study is hypothesis testing with two hypotheses and using path analysis. The population of the respondents from this study were 550 manufacturing companies in Jakarta with data collection were performed through online questionnaires and the number of samples that met the criteria for analysis from 150 manufacturing companies represented by leaders in the supply chain management section. The results of this study indicate that supplier integration has a positive effect on supply chain performance, transformational leadership style has a positive effect on supply chain performance and supplier integration has a positive effect on transformational leadership style in Indonesian manufacturing companies. The results of the study can be a reference for decision makers and supply chain management leaders to implement supply chain management strategies in the form of integration with suppliers to improve the company's supply chain performance and to consider the influence of supply chain transformational leadership styles to maintain the sustainability of long-term relationships with suppliers in multinational companies which already has a standard and standard system.