SASBReport With TCFD-Aligned Index 2021 500 Centre Street S.E. Calgary, Alberta, Canada T2G 1A6 www.grantierra.comContents Message from Leadership About Gran Tierra Energy About this Report ESG Materiality Assessment Gran Tierra Energy’s Approach to ESG Governance ESG Oversight ESG-Related Policies Board Diversity Business Ethics and Transparency Environment Climate Change & Greenhouse Gas Emissions Biodiversity Impacts Water Management Social Community Relations Security, Human Rights, and Rights of Indigenous Peoples Workforce Health & Safety Human Capital Management ESG Performance Table SASB Index TCFD Index 2021 SASB REPORT 2 3 5 5 6 9 13 22 7 10 16 28 37 7 12 22 10 20 32 38 42 46Message from Leadership After the many challenges in 2020 that the world faced, 2021 was a year of strong recovery for the energy industry and Gran Tierra. Our teams’ excellent work throughout 2021 has strongly positioned Gran Tierra for the continued development and enhanced oil recovery activities in 2022, to optimize value from each of our assets. The talent and dedication of our workforce and the trust we have built with local regional, and national stakeholders continue to be a key area of strength for the company. Gran Tierra Energy’s foundation is built on running a profitable and stable business while responsibly maintaining and growing a high-quality portfolio. Our commitment to all stakeholders is to do this in a financially sustainable manner, providing the strength to reliably deliver on our ESG commitments. Our ESG focus remains strong and is achieved through our Going Beyond Compliance philosophy. Where Gran Tierra identifies significant opportunities and benefits to the environment and communities, we voluntarily strive to go beyond what is legally required to protect the environment and provide social benefits, because it is the right thing to do. Our industry and operations continue to face headwinds, with social unrest growing in South America and the progression of the energy transition. Our commitment to ESG positions us well to succeed in challenging environments. As a responsible energy producer, our goal is to create the most value with the least environmental impact possible. We do this by maintaining operational integrity across all our infrastructure, designing our processes to maximize efficiency and meet rigorous international standards. Since 2019, we’ve reduced our overall emissions by 55% and over the last five years we have decreased our surface water usage by more than 41%. In this report, we provide a TCFD Index which sets out how our ESG reporting aligns with the recommendations of the Task Force on Climate-related Financial Disclosures as this framework has emerged as the investor-preferred framework for climate-related disclosure. Our flagship conservation program, NaturAmazonas, which we conduct in partnership with Conservation International, has now completed its fifth year and has added more than one million trees and conserved, preserved or reforested over three thousand hectares of the Colombian Amazon rainforest. The program’s success has set a new Colombian standard for industry-led conservation, with other businesses and institutions joining the effort to continue and scale this work. Looking ahead, we will continue to develop our approach to ESG and enhance our ESG disclosure to drive stronger understanding of the ESG risks and opportunities that our business faces, and how we are positioning ourselves to mitigate key risks and capture opportunities. On behalf of our Board of Directors and the team at Gran Tierra Energy, we want to thank all of our stakeholders for their continued support. 2 2021 SASB REPORT GARY GUIDRY, PRESIDENT AND CEO, GRAN TIERRA ENERGYGran Tierra Energy is an international oil and gas exploration and production company focused on hydrocarbon development in proven, under-explored conventional basins which have access to established infrastructure and competitive fiscal regimes. Our mandate is to develop high-value resource opportunities to deliver top-quartile returns. We intend to continue to high-grade our portfolio, with a continued focus on operational excellence, safety, and stakeholder returns. The senior management team has a proven track record in developing technically difficult reservoirs, enhanced oil recovery, and operating in remote locations in demanding jurisdictions. We aim to have a meaningful and sustainable impact through social investments within the communities we operate. Gran Tierra is headquartered in Calgary, Canada, incorporated in Delaware, United States, and traded on the New York Stock Exchange American, the London Stock Exchange and the Toronto Stock Exchange under the ticker symbols GTE. About Gran Tierra Energy 3 2021 SASB REPORTAbout Gran Tierra Energy 4 Gran Tierra’s Focused Strategy 2021 SASB REPORT Sustainable business model with significant value in booked reserves base Robust free cash flow and attractive returns in supportive fiscal regimes Disciplined financial strategy; prudent discretionary capital programs World-class development and low risk exploration in four proven onshore basins Going Beyond Compliance 1P reserves underpin value; clear path to 2P and 3P exploitation; world-class hydrocarbon basins Continued growth in 2022, flexible, progressive fiscal regimes Focused on debt reduction, long-term value creation Extensive seismic and well data across expansive acreage position Meaningful and sustainable impact within the communities where we operate, with a continued focus on reducing emissionsAbout This Report 5 2021 SASB REPORT Gran Tierra Energy is committed to providing annual ESG reporting. In May 2022, we released our 13th annual 2021 Sustainability Report which focuses on reporting on our corporate social responsibility and sustainability activities and targets our broader stakeholders. This ESG Report is a supplement to the 2021 Sustainability Report and focuses on reporting on Gran Tierra’s ESG factors with the greatest potential to impact our company’s value to provide targeted ESG disclosure to the company’s financial stakeholders. This report provides ESG performance results for 2021, and where available, presents data for the previous three years to allow for trend analysis and to provide additional context for Gran Tierra’s performance results. See ESG Performance Data for a consolidation of Gran Tierra’s ESG performance data. This report is aligned with the Sustainability Accounting Standards Board’s Oil and Gas – Exploration & Production Sustainability Accounting Standard. We selected the SASB Standards as they have emerged as the investor preferred ESG reporting framework. For further details, see SASB Content Index. This report also provides a TCFD Content Index which sets out how our reporting aligns with the recommendations of the Task Force on Climate-related Financial Disclosures (TCFD recommendations) as the TCFD recommendations have emerged as the investor-preferred framework for climate-related disclosure. Data presented in this report includes data for the entire company. Any data limitations are explicitly noted where relevant. Financial data is stated in U.S. dollars unless otherwise noted. Additional ESG-related and company information can be found in the following documents: Sustainability Report, Management’s Discussion and Analysis, Financial Statements, Form 10-K, Management Information Circular, Extractive Sector Transparency Measures Act Report available on Gran Tierra’s website, on SEDAR, or on EDGAR. ESG Materiality Assessment To inform Gran Tierra’s approach to ESG and the contents of our ESG report, we conducted an ESG Materiality Assessment focused on identifying the ESG factors with the greatest potential to impact the value of our company. The ESG Materiality Assessment referenced leading ESG reporting frameworks, in particular SASB’s Oil & Gas – Exploration & Production Sustainability Accounting Standard, and considered additional sources including the TCFD recommendations, ESG-related regulation, ESG trends, investor and industry initiatives, relevant ESG guidance, and peers’ disclosure. In advance of the publication of this report, we reviewed and refreshed our ESG Materiality Assessment to ensure that the assessment of the potential impacts of ESG factors on Gran Tierra’s value is current and reflects the rapidly evolving ESG landscape. The ESG factors included in this report represent those ESG factors identified in the ESG Materiality Assessment as having the greatest potential to impact the financial and operational performance of our company. The sustainability factors included in Gran Tierra’s 2021 Sustainability Report represent the sustainability and corporate social responsibility activities of greatest interest to broader stakeholders. Gran Tierra will periodically review and update the ESG Materiality Assessment as needed given the dynamic nature of materiality, changing market conditions and any future growth or diversification of the company.Gran Tierra Energy’s Approach to ESG ESG is an integral part of Gran Tierra culture. We are committed to providing meaningful opportunities for economic growth, community development and local content development, prioritizing local goods and services, and investing in social and environmental projects. Gran Tierra believes in creating value for all of our stakeholders through oil and gas exploration and production, capitalizing on the global operating experience of our team. We are building a record of success in Colombia and Ecuador in a transparent, safe, secure and responsible way. We aim to have a meaningful and sustainable impact through social impact management and community investments within the communities near our operations and focus our approach on mitigating risks and capturing opportunities associated with the ESG factors that have the greatest potential to impact company value. A key pillar of our value creation narrative is Going Beyond Compliance and our philosophy of Going Beyond Compliance influences the decisions we make with respect to ESG. We voluntarily go beyond what is legally required to care for the environment and undertake respectful engagement with local communities. Gran Tierra strives to create a meaningful and sustainable impact within the communities where we operate, with a continued focus on reducing emissions and the protection or restoration of impacted biodiversity, including deforestation from illegal crop cultivation. Gran Tierra recognizes that the energy transition is occurring with existing and developing technologies and that oil and gas remain essential to meet global energy demand, but that energy production needs to be adaptive, efficient and sustainable. Our approach is to develop high value resource opportunities, to have a meaningful and sustainable impact through social investments, contribute to local, regional and national economic development through taxes, royalties, jobs and local procurement, and to focus on operational excellence, safety, and reduction of emissions. We believe this approach positions us well to succeed as a business. 6 Social Investments GTE aims to have a meaningful and sustainable impact through social investments within the communities near where it operates Continuous Improvement Continued focus on operational excellence, safety, and reduction of emissions Maximize Value GTE’s mandate is to develop high value resource opportunities in order to develop top-quartile returnsGovernance Gran Tierra Energy is committed to good corporate governance practices, which promote the long-term interests of shareholders and other stakeholders and strengthens Board and management accountability. •Independent, non-executive Board chair •22% female representation on the Board •88.9% of Board directors are independent •7 of 9 directors have skills and experience related to ESG areas •Annual elections of all directors •Majority voting for directors with resignation policy •100% independent Committee members •Annual self-evaluation of the Board •Stock ownership guidelines for directors and officers •Clawback policy 7 ESG Oversight Gran Tierra Energy’s Board of Directors has oversight of ESG, including climate change factors, with each committee playing a role in oversight of different aspects of ESG performance. The full Board receives a quarterly update on ESG performance, including against established ESG KPIs, and approves all Corporate Policies [TCFD Governance a]. Gran Tierra Energy’s Board Skills Matrix includes the skills and experience desirable to support the strategic direction of the Company. Not every director is expected to be skilled in every area; however, we aim for the Board to have a balance of skills and experience. 7 of 9 directors have skills and experience related to health, safety, and environmental issues. For more detail on the Board’s additional skills and experience, see the Skills Matrix in the Notice of 2022 Annual Meeting of Stockholders & Proxy Statement. Each director is expected to maintain the necessary level of expertise to perform his or her responsibilities as a director. Continuing education is provided through a number of methods, including an annual dedicated strategy session, periodic field trips, presentations from senior management, employees, and outside experts to the Board and its Committees on topics of interest and developing issues. Management is responsible for ensuring that the Board and its committees are kept well informed of changing risks. The Vice President, Health Safety and Environment (HSE) & Corporate Social Responsibility (CSR) is responsible for identifying, assessing and managing ESG factors, including climate change factors, and reports to the Health, Safety & Environment Committee of the Board on a quarterly basis. The Vice President, HSE & CSR is supported by all employees within the Health and Safety, Social Responsibility, and Environmental Compliance and Licensing teams. Analyst Corner TCFD Governance a + Notice of 2021 Annual Meeting of Stockholders and Proxy Statement + TCFD Governance b +8 Board of Directors Reserves Committee Nominating and Corporate Governance Committee Compensation Committee Audit Committee Health, Safety and Environment Committee Vice President, Health, Safety and Environment & Corporate Social Responsibility Health and Safety, Social Responsibility and Environmental Compliance and Licensing teams Accountable PartiesSummary of Responsibilities Board of Directors•The full Board is entrusted with the responsibility for overseeing the significant risks to which our company is exposed and ensuring that management has processes in place to effectively identify, monitor and manage them. •The Board delegates responsibility for the execution of certain elements of risk oversight to the committees in order to ensure appropriate expertise, attention and diligence. The committees oversee the relevant risk areas and report to the Board regularly. Health, Safety and Environment Committee •The Health, Safety and Environment Committee (HSE Committee) assists in overseeing the development, monitoring and effective implementation of systems, programs, and initiatives to promote the management of health, safety, and security at Gran Tierra and to address environmental, safety, and operational risks, including climate change risks. •The HSE Committee is responsible for reporting to the Board on environmental, health and safety policies and activities, including with respect to climate change, approving Gran Tierra’s environmental, health, and safety goals and objectives and monitoring company performance. •The HSE Committee reports at least quarterly to the full Board on environmental, health and safety issues, trends, and risks and on the state of compliances with relevant laws, legislation and adherence to Gran Tierra’s ESG-related policies. Nominating and Corporate Governance Committee •The Nominating and Corporate Governance Committee assists in overseeing governance- related risks, including regulatory, reputation and other risks. Compensation Committee•The Compensation Committee is responsible for oversight of compensation-related risks, including reviewing management’s assessment of risks related to employee compensation programs. Audit Committee•The Audit Committee is responsible for overseeing the integrity of Gran Tierra’s financial statements, the independent auditor’s qualifications and independence, the performance of our internal audit function and independent auditor, compliance with legal and regulatory requirements, major financial and information technology risk exposures and Gran Tierra’s accounting and financing reporting processes. Reserves Committee•The Reserves Committee assists in overseeing the risks related to Gran Tierra’s estimates of Reserves of oil and natural gas. ESG Oversight Analyst Corner Reserves Committee + Health, Safety and Environment Committee Charter + Compensation Committee + Audit Committee ++ Nominating and Corporate Governance Committee Table 1: Board Skills and Responsibilites MatrixNext >