The Pars Special Economic Energy Zone was established to utilize the vast oil and gas resources of the South Pars region and to develop economic activities in the fields of oil, gas, and petrochemicals along the coastal strip of Assaluyeh and the Nayband Gulf. This zone, focusing on attracting investment and enhancing industrial production, hosts numerous petrochemical companies, with their activities being conducted within the framework of the governing policies and upstream documents of the petrochemical industry. The management of this zone, under the responsibility of the Pars Special Economic Energy Zone Organization, requires a precise understanding and assessment of these companies' performance based on the criteria and objectives defined in the upstream documents. In this article, by referring to these documents, key indicators were identified in four areas: production, sales, customers, and human resources, and five key metrics were extracted, including "nominal capacity," "production volume," "utilization rate," "domestic sales value," and "inter-plant sales volume." The performance of 20 petrochemical companies in the region was evaluated and ranked using multi-criteria decision-making (MADM) techniques and data normalization through the Shannon entropy method. Additionally, SAW and TOPSIS techniques were employed for the final assessment. The results indicate a significant performance gap between the companies, with "Pardis Company" ranked first and "Sabalan Industries" ranked last. These findings highlight the importance of aligning company performance with the objectives and indicators defined in the upstream documents and demonstrate that targeted evaluations can effectively improve performance and help achieve the macro objectives of the petrochemical industry.