This report provides a comprehensive financial analysis of four ASX-listed companies in the Australian energy sector: Caltex Limited, Origin Energy, Woodside Petroleum, and Whitehaven Coal. It examines their financial performance, solvency, and equity structures, focusing on changes in equity items over the past four financial years (2013-2017). The report also discusses the importance of corporate regulation in financial reporting and the role of the Australian Accounting Standards Board (AASB) in setting accounting standards and contributing to global standards development. A comparative analysis of the companies' capital structures is included to assess their financial risk, highlighting Whitehaven Coal's strong solvency position and Origin Energy's relatively weaker position. This document is available on Desklib, a platform offering study tools and solved assignments for students.