This study aimed to know the influence of the implementation of internal supply chain management on company's operational performance at PT. Pan Brothers Tbk, Boyolali. The method used to collect the data is questionnaire. The sampling methods used are the purposive and incidental sampling with 50 respondents from 100 population. The analysis methods used are the validation test, reliability test, simple linear regression, T test, and determination coefficient with SPSS 20. The empirical result showed that there is a positive and significant influence of the information sharing on company's operational performance. So, it can be concluded that the implementation of supply chain management (information sharing) affect significantly toward company's operational performance with the determination coefficient of R square 65.7%, while 34.3% is explained by other variables (e.g. long term relationship, cooperation, integration process).