Abstract : Indonesia’s national oil company implements a structured Health, Safety, Security, and Environmental (HSSE) management system for sustainability and risk mitigation. However, variations in compliance and effectiveness across operational units necessitate evaluation. This study assesses the HSSE performance framework to identify strengths, challenges, and areas for improvement. This study utilized secondary data obtained from the company’s annual reports. Measurements were conducted based on reported outcomes since the implementation of the company framework. The research follows a cross-sectional study design, as it analyzes data collected at a specific point in time or within a defined period to assess the implementation and performance of the framework. No experimental interventions or variable manipulations were conducted, making this study an observational assessment of the framework’s effectiveness in enhancing HSSE management within the organization. The analysis was conducted using SPSS version 16, applying both descriptive and statistical methods. Findings indicate that major incidents receive thorough investigations, while minor incidents are often overlooked, contributing to cumulative risks. Risk assessment frameworks were applied systematically, yet inconsistencies in severity interpretation were observed. While management reviews were conducted annually, their impact depended on leadership engagement. Compliance with HSSE standards was high, but a compliance-driven approach sometimes hindered proactive safety culture development. Limited cross-departmental collaboration also restricted effective knowledge transfer. The study concludes that while the HSSE framework provides a solid foundation, continuous improvements are needed. Strengthening leadership involvement, standardizing risk assessment interpretations, and fostering a proactive safety culture are crucial for long-term sustainability and safety excellence.