Sustainable Development Report 2019

The MYTILINEOS Sustainable Development Report (hereinafter the “Report”), published annually, [GRI 102-52] refers to the review of the Company's non-financial performance, supplements its Annual Financial Report and is available online at the official website of MYTILINEOS mytilineos.gr/en-us/csr-reports/publications. To send your remarks, comments or suggestions about the Report's content, please use the custom-designed questionnaire available at mytilineos.gr/en-us/survey/survey-about-mytilineos, while for additional information or clarifications, please use the contact details given below: Mr. George Galanis Sustainable Development Director MYTILINEOS S.A. 8 Artemidos Street Maroussi, 151 25 Athens E-mail: georgios.galanis@mytilineos.gr • The most significant change in this Report concerns the change in the identification and presentation of the individual issues of material significance for the Company's sustainable development, previously grouped into broader categories for The structure of the Report is organized with a view to present- ing quantitative and qualitative data about the performance of MYTILINEOS in meeting key Environmental, Social and Governance criteria and has been prepared in accordance with the GRI Standards “Core” option. [GRI 102-54] The data and information presented in the Report are initially The data about these activities are obtained from the MYTILINEOS Central Function of Business Sectors in the Greek territory, the construction sites operated by the Company through its EPC & Infrastructure Projects Sector in countries abroad, its RES subsidiaries currently in full operation and its other subsidiaries in which the Company's s participation is over 50%, as stated in its Annual Report. Non-financial data from Zinc/Lead Metallurgy operations are not included. [GRI 102-45] Sector Activities Metallurgy • Bauxite mining • Production of anhydrous and hydrated alumina • Production of aluminium alloys • Operation of port facilities, loading and unloading of products • Treatment of aluminium alloys Electric Power & Gas Trading • Electric Power generation • Development, organization, supervision of construction, operation and maintenance of RES power stations • Management and sale of electric power • Supply of electricity to the retail market • Supply of natural gas to the retail market EPC & Infrastructure Projects • Development, management, construction, operation and maintenance of integrated projects • Development, management, construction, operation and maintenance of building construction and infrastructure projects • Development, management, manufacture, operation and maintenance of electromechanical equipment for energy and infrastructure projects. • Development, management, construction, operation and maintenance of photovoltaic & hybrid projects Parameters of the Sustainable Development Report The Report was prepared in accordance with the Standards of the Global Reporting Initiative Organization (GRI Standards), the ISO 26000 Corporate Social Responsibility International Standard and the 10 Principles of the UN Global Compact, and com- plies with the relevant obligations under Greek legislation and European Directives. Principles of drafting the Report Scope of the Report Report details There is no reprinting of information in relation to previous edi- tions, while new data in this Report are: • A new section titled “ESG Performance Overview” • A new section reporting on the Company's activities regarding its contribution to the Global Sustainable Development Goals • New “Management Approach” subparagraphs for each Material issue • Enhanced Environmental & Social performance indicators, as well as their Governance Indicators • Addition of the table presenting the Company's alignment with the Athens Stock Exchange ESG reporting guide • Inclusion in the Report of the GRI Standards Content Index, which in previous reports was produced as a separate file • A new section titled “Index of Key Terms” Restatements of information [GRI 102-48] Significant changes from previous reporting periods Communication [GRI 102-53] This Report covers the period from 1/1/2019 to 31/12/2019 [GRI 102-50] and includes data about the following activities per Business Sector of the Company. collected at the first level based on the procedures and ways of recording that are applied in each Sector of Business Activity and the subsidiaries of the Company but also by the databases that are observed in the context of the application of the cen- tral corporate systems. The data is then forwarded through the integrated management system for the disclosure of non-fi- nancial performance, which consists of a software platform developed in-house (custom-configured Excel files based on the GRI Standards). The calculation of the data composing the non-financial per- formance indicators included in the Report generally follows the definitions and the methodology described in the respec- tive GRI Standards. The data are checked and verified using the SAP system (where available), as well as using internationally accepted verification methods which the Company has available, such as the OHSAS 18001 Occupational Health and Safety Management Systems, the ISO 14001 Environmental Management Standard, the ISO 14064 Greenhouse Gas Inventory Management and Reporting System (where this is in place) and the ISO 9001 Quality Management Standard. Also, included data from direct measurements or estimates, while in the case of certain quantitative indicators, three – or five-year historical data are mentioned for comparison purposes. Performance results at top level are calculated by consolidating (aggregating the relevant quantities) the individ- ual data obtained from the Business Sectors and subsidiaries of the Company. The content focuses on the sustainability issues which are signif- icant to the achievement of the strategic goals of MYTILINEOS and which have been identified based on the Company's formal Materiality process, in accordance with the GRI Standards [GRI 102-40] to [GRI 102-47] . The information presented in the Report is supplemented by the required references to the Company's Annual Report 2019. the purposes of their identification and prioritization by the Stakeholders, so that the impacts of individual issues and the relevant needs and expectations of the Social Partners to be assessed individually. [GRI 102-49] • Inclusion of data from two (2) new subsidiaries of the Company (EPALME & Zeologic) • Inclusion of environmental data from METKA EGN • Revision of the environmental expenditures to account for the inclusion of the cost of CO2 emissions 9 8

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