This report analyzes the disclosure of aspects of supply chain sustainability by the top 100 companies on the Australian Securities Exchange (ASX). The report highlights good practices in upstream and downstream policies and procedures, but also shows a wide range of variability in disclosure. The report is part of a series of research projects carried out by the Net Balance Foundation in collaboration with ACCA Australia and New Zealand. Other reports in the series include: Adoption of Integrated Reporting by the ASX 50, 2011; Disclosures on Managing Human Rights Risks, 2011; Disclosures on Water, 2010; Disclosures on Social Investment, 2010; Disclosures on Corporate Governance, 2009; Anti-bribery and Corruption Reporting Disclosures, 2008; Disclosures on Human Capital Management, 2008; Disclosures on Climate Change, 2007; and Disclosures on Stakeholder Engagement, 2007.