2 2 REPORT SCOPE & BOUNDARY This report covers key activities from CMC’s 2015 and 2016 fiscal years, which began in September 2014 and ended in August 2016. The highlights and key performance metrics presented are from 2015 and 2016 fiscal years, except for our environmental performance data, which is collected and managed on a calendar year basis. Unless otherwise shown, we are reporting data and information from our global enterprise which includes our Recycling, Mills, Fabrication and Marketing and Distribution business segments. All financial information is presented in U.S. dollars unless otherwise noted. DEFINING REPORT CONTENT Information provided in this report is targeted at our key stakeholders, whom we identify as our customers, employees, communities and shareholders. This report covers the sustainability topics that are most important to those stakeholders and have the most impact on our company. Although we are including Standard Disclosures from the Global Reporting Initiative’s G4 Sustainability Reporting Guidelines, we have not endeavored to report in accordance with GRI. A GRI Content Index is provided at the back of this report to help stakeholders find information relevant to their needs. At CMC, sustainability is a continuous effort, and we plan to report on a bi-annual basis to show our progress. RESTATEMENTS Below are restatements of our 2014 baseline data that were found to be subject to change during the data collection process for this report. Data has been corrected or adjusted in the body of the 2015-16 Sustainability Report. •  Energy consumption data now includes both electricity and natural gas – while CMC believes our natural gas usage to be minor relative to our electricity use, we have natural gas data available and have decided to include a more comprehensive picture of total energy consumption moving forward. •  We have restated our energy intensity based on crude steel instead of finished steel to be more aligned with the reporting of our industry peers. •  Our baseline greenhouse gas emissions have been restated, as the 2014 data for our European operations was recorded on a fiscal year basis. •  Recycled content in manufacturing finished steel now includes our European operations. The data collected for this report has been gathered using the robust systems and tools currently in place for the reporting year. Continuous improvement of our data collection and analysis processes is an ongoing focus for CMC. About this Report TABLE OF CONTENTS 3 An Introduction 5 About Us 10 Managing Our Sustainability Impact 16 Environmental Stewardship 24 Valuing Our People 34  Contributing To Communities 42 Customer Service and Product Responsibility 48 GRI Content Index