Notice of Meeting

Annual Meeting of the Stockholders of Gran Tierra Energy Inc.

The business of the meeting is to:

These items of business are more fully described in the proxy statement accompanying this notice.

This notice and the attached proxy statement are first being mailed to our stockholders beginning on or about March 25, 2021.24, 2023. Holders of shares on March 9, 2021,7, 2023, the record date, are entitled to notice of, and to vote at, our meeting or any adjournment or postponement thereof.

In light of the COVID-19 pandemic and to mitigate the risks to the health and safety of our community, stockholders and employees, Gran Tierra will be holding its annual meeting in a virtual-only format by way of webcast accessed at www.meetingcenter.io/296994452https://web.lumiagm.com/251955864 and no physical or in-person meeting will be held. A virtual-only meeting will provide all stockholders an equal opportunity to participate at the annual meeting regardless of their geographic location or the particular constraints, circumstances or risks they may be facing as a result of COVID-19.facing. Stockholders will be able to attend the Annual Meeting of Stockholdersannual meeting online and vote their shares electronically and submit questions during the meeting.

If you are a registered stockholder, to attend the Annual Meetingannual meeting and vote your shares electronically and submit questions during the meeting, you will need the control number included on the Notice of Internet Availability of Proxy Materials or proxy card that accompanied your proxy materials. If you are the beneficial owner of shares held in “street name”, you must request and obtain a validwish to attend the meeting insert your name in the blank space included in the proxy fromform provided by your broker or other agent in orderand submit such proxy form to attendyour broker or other agent prior to the Annual Meeting andvoting deadline to vote your shares electronically and submit questions during the meeting. In addition you must also register your appointment (of your broker or other agent) by emailing appointee@odysseytrust.com no later than the voting deadline and provide Odyssey with your name, email, number of shares appointed and name of broker or other agent where shares are held, so that Odyssey may email the appointee their control number.

We are using the “Notice and Access” method of providing proxy materials to our stockholders which provides our stockholders with a convenient way to access the proxy materials and vote, while allowing us to lower the costs of printing and distributing the proxy materials and reduce the environmental impact of our meeting. We will mail to most of our stockholders a Notice of Internet Availability of Proxy Materials (the “Notice”) in lieu of a paper copy of our proxy materials. Stockholders receiving the Notice may review the proxy materials online or request a paper copy by following the instructions set forth in the Notice.

Please submit your proxy or voting instructions on the Internet or by telephone promptly by following the instructions about how to view the proxy materials on your Notice of Internet Availability of Proxy Materials so that your shares can be voted, regardless of whether you expect to attend the annual meeting. If you received your proxy materials by mail, you may submit your proxy or voting

instructions on the Internet or by telephone, or you may submit your proxy by marking, dating, signing and returning the enclosed proxy/confidential voting instruction card. If you attend the annual meeting, you may withdraw your proxy and vote in person.virtually at the annual meeting.

Shareholders who have any questions should contact the Company’s strategic shareholder advisor and proxy solicitation agent, Kingsdale Advisors, at 1-855-476-7987 (toll-free within North America) or 1-416-867-2272 (collect call outside North America) or by e-mail at contactus@kingsdaleadvisors.com.

By order of the Board of Directors

Calgary, Alberta, Canada

March 25, 202124, 2023

Proxy Statement Table of Contents

Questions and Answers About the Proxy Materials and 20212023 Annual Meeting

Why am I receiving these materials?

We are sending you these proxy materials because the Board of Directors (the “Board”) of Gran Tierra Energy Inc., a Delaware corporation (“Gran Tierra” or the “Company”), is soliciting your proxy to vote at the 20212023 annual meeting of stockholders, including at any adjournments or postponements of the annual meeting. You are invited to attend the annual meeting, which is being held in a virtual-only format by way of webcast accessed at www.meetingcenter.io/296994452,https://web.lumiagm.com/251955864, to vote on the proposals described in this proxy statement. However, you do not need to attend the annual meeting to vote your shares. Instead, if you are a stockholder of record of our common stock, you may simply complete, sign and return the proxy card if you received a paper copy of our proxy materials, or follow the instructions below to submit your proxy over the telephone or through the internet. See “How do I vote” below for further information on how to vote, including if you hold our common stock through a broker in “street name” or hold exchangeable shares.

Pursuant to rules adopted by the Securities and Exchange Commission (the “SEC”), we have elected to provide access to our proxy materials over the internet. We are sending to our stockholders of record the proxy materials, including this proxy statement and an annual report, or a Notice Regarding the Availability of Proxy Materials (the “Notice”). We intend that our stockholders who hold their stock in “street name” will receive a Notice from their broker, bank or other agent in which they hold the stock in “street name,” unless they have specified otherwise. All stockholders will have the ability to access the proxy materials on the website referred to in the Notice or request to receive a printed set of the proxy materials. Instructions on how to access the proxy materials over the internet or to request a printed copy may be found in the Notice.

We intend to mail the proxy materials and Notice beginning on March 25, 2021,24, 2023 to all stockholders of record entitled to vote at the annual meeting. We expect that the Notice will be sent to stockholders who hold their stock in “street name” on or about this same date.

How do I attend the annual meeting?

The annual meeting will be held on Wednesday, May 5, 2021,3, 2023, at 1:30 p.m.10:00 a.m. (Mountain time) and will be held solely by remote communication, in a virtual-only format.

Instructions to Attend Online Meeting

How can I request technical assistance during the virtual annual meeting?

If you encounter any difficulties accessing the virtual meeting during the check-in or during the meeting, please call the technical support number accessed by clicking “Additional Information” on the log-in page at www.meetingcenter.io/296994452.

Who can vote at the annual meeting?

Only stockholders of record at the close of business on March 9, 2021,7, 2023, will be entitled to vote at the annual meeting. On this record date, there were 366,981,556346,151,157 shares of common stock outstanding and entitled to vote.

A list of stockholders of record will be made available to participants who joinfor ten days before the annual meeting at the Company’s principal executive offices for inspection by stockholders during ordinary business hours for any purpose germane to the annual meeting and during the meeting to stockholders upon request via email to: info@grantierra.com, subject to satisfactory verification of status as a “Shareholder” at www.meetingcenter.io/296994452.stockholder of record.

Stockholders of Record: Shares Registered in Your Name

If at the close of business on March 9, 2021,7, 2023, your shares were registered directly in your name with Gran Tierra’s transfer agent, Computershare Investor Services,Odyssey Trust Company, then you are a stockholder of record. Registered stockholders will receive a proxy form containing the relevant details concerning the business of the meeting, including a control number required to access the virtual annual meeting.

QUESTIONS AND ANSWERS ABOUT THE PROXY MATERIALS AND 20212023 ANNUAL MEETING

Whether or not you plan to attend the annual meeting, we urge you to fill out and return the proxy or vote by proxy by telephone or on the internet as instructed below to ensure your vote is counted.

Beneficial Owner: Shares Registered in the Name of a Broker or Bank

If at the close of business on March 9, 2021,7, 2023, your shares were held, not in your name, but rather in an account at a brokerage firm, bank, dealer, or other similar organization, then you are the beneficial owner of shares held in “street name” and the Notice, and/or these proxy materials if you have received them, are being forwarded to you by that organization. The organization holding your account is considered to be the stockholder of record for purposes of voting at the annual meeting. As a beneficial owner, you have the right to direct your broker or other agent regarding how to vote the shares in your account. You are also invited to attend the annual meeting. However, since you are not the stockholder of record, you may not vote your shares electronically or submit questions at the annual meeting unless you request and obtain a valid proxy from your broker or other agent. See “How Do I Vote? - Beneficial Owner: Shares Registered in the Name of Broker or Bank” below for additional information about attending and participating in the Annual Meeting.annual meeting.

What am I voting on?

There are four matters scheduled for a vote:

What if another matter is properly brought before the annual meeting?

The Board knows of no other matters that will be presented for consideration at the annual meeting. If any other matters are properly brought before the annual meeting or any adjournment or postponement thereof, it is the intention of the persons named in the accompanying proxy to vote on those matters in accordance with their best judgment.

Will I be able to submit questions during the virtual annual meeting?

Stockholders will be able to submit questions through the virtual meeting website. Questions pertinent to meeting matters that comply with the meeting rules of conduct will be answered during the meeting, subject to time constraints. However, we reserve the right to exclude questions that are not pertinent to meeting matters, irrelevant to the business of the Company, derogatory or in bad taste, or relate to pending or threatened litigation, personal grievances or are otherwise inappropriate. Questions that are substantially similar may be grouped and answered once to avoid repetition.

How do I vote?

You may either vote “For” or “Against” or abstain from voting with respect to each nominee to the Board and each of the other matters to be voted on.

Stockholders of Record: Shares Registered in Your Name

If you are a stockholder of record, you may vote electronically at the annual meeting, vote by proxy on the internet or by telephone, or vote by proxy using a proxy card that you may request or that we may elect to deliver at a later time. Whether or not you plan to attend the annual meeting, we urge you to vote by proxy to ensure your vote is counted. You may still attend the annual meeting and vote electronically even if you have already voted by proxy.

QUESTIONS AND ANSWERS ABOUT THE PROXY MATERIALS AND 20212023 ANNUAL MEETING

To vote on the internet, go to http:https://www.investorvote.com/GTE to complete an electronic proxy card.login.odysseytrust.com/pxlogin and follow the on-screen instructions. You will be asked to provideneed the company number and control number fromlocated on the Notice or proxy card.Form of Proxy to access the voting site. Your internet vote must be received by 1:30 p.m.10:00 a.m. (Mountain time) on May 4, 2021,1, 2023, to be counted. The Chair of the Meeting reserves the right to accept late proxies and may waive or extend the proxy cut-off, with or without notice, but is under no obligation to accept or reject any particular late proxy.

We provide telephone andthe option for internet proxy voting to allow you to vote your shares, with procedures designed to ensure the authenticity and correctness of your proxy vote instructions. However, please be aware that you must bear any costs associated with your telephone or internet access, such as usage charges from internet access providers and telephone companies.providers.

Beneficial Owner: Shares Registered in the Name of Broker or Bank

If you are a beneficial owner of shares registered in the name of your broker, bank, or other agent, you should have received a Notice containing voting instructions, or these proxy materials and an annual report and form of proxy, from that organization rather than from Gran Tierra. Simply follow the voting instructions you receive from your broker, bank, or other agent to ensure that your vote is counted. If you have received these proxy materials and voting instructions therein, simply complete and mail the voting instructions to ensure that your vote is counted. Alternatively, if permitted by your broker or bank, you may vote by telephone or on the internet as instructed by your broker, bank or other agent. To vote electronically during the annual meeting, you must obtain a valid proxy from your broker, bank, or other agent and appoint yourself as a proxyholder. Follow the instructions from your broker, bank, or other agent included with these proxy materials, or contact your broker, bank, or other agent to request a proxy form.

Once In addition you have received a valid proxy frommust also register your appointment (of your broker bankor other agent) by emailing appointee@odysseytrust.com no later than the voting deadline and provide Odyssey with your name, email, number of shares appointed and name of your broker or other agent it should be emailedwhere shares are held, so that Odyssey may email the appointee their control number.

The Corporation may utilize the Broadridge QuickVote^™ system, which involves NOBOs being contacted by Kingsdale, which is soliciting proxies on behalf of Management, to our transfer agent, Computershare, at legalproxy@computershare.comobtain voting instructions over the telephone and should be labeled “Valid Proxy”relaying them to Broadridge (on behalf of the NOBO’s Intermediary). While representatives of Kingsdale are soliciting proxies on behalf of Management, Shareholders are not required to vote in the subject line. Please include proofmanner recommended by the Board of Directors. The QuickVoteTM system is intended to assist Shareholders in placing their votes, however, there is no obligation for any Shareholders to vote using the QuickVoteTM system, and Shareholders may vote (or change or revoke their votes) at any other time and in any other applicable manner described in this Circular. Any voting instructions provided by a Shareholder will be recorded and such Shareholder will receive a letter from Broadridge (on behalf of the Shareholder’s Intermediary) as confirmation that their voting instructions have been accepted.

Shareholders who have any questions should contact the Company’s strategic shareholder advisor and proxy solicitation agent, Kingsdale Advisors, at 1-855-476-7987 (toll-free within North America) or 1-416-867-2272 (collect call outside North America) or by e-mail at contactus@kingsdaleadvisors.com.

A shareholder has the right to appoint a person or entity (who need not be a shareholder) to attend and act for him/her on his/her behalf at the meeting other than the persons named in the enclosed instrument of Proxy. Shareholders who wish to appoint a third party proxyholder to represent them at the online meeting must submit their proxy or voting instruction form (if applicable) prior to registering your proxyholder. Registering your proxyholder is an additional step once you have submitted your proxy or voting instruction form. Failure to register the proxyholder will result in the proxyholder not receiving a Username to participate in the meeting. To register a proxyholder, shareholders MUST email appointee@odysseytrust.com and provide Odyssey Trust Company with their proxyholder’s contact information, including email address of appointee, amount of shares appointed and the name of broker bank or other agent of your valid proxy (e.g.,where shares are held, so that Odyssey Trust Company may provide the proxyholder with a forwarded email from your broker, bank or other agent with your valid proxy attached, or an image of your valid proxy attached to your email) reflecting your Gran Tierra Energy Inc. holdings along with your name and email address to Computershare.control number via email. Requests for registration must be received by ComputershareOdyssey Trust Company no later than 1:30 p.m.10:00 a.m. (Mountain Time), on Friday,Monday, May 1, 2021.2023. You will receive a confirmation of your registration by email after ComputershareOdyssey Trust Company receives your registration materials. At the time of the meeting, go to www.meetingcenter.io/296994452https://web.lumiagm.com/251955864 and enter your control number and the meeting password, GTRE2021.grantierra23.

How many votes do I have?

On each matter to be voted upon, you have one vote for each share of common stock you own as of March 9, 2021.7, 2023. Cumulative voting is not permitted.

What if I return a proxy card or otherwise vote but do not make specific choices?

Stockholder of Record; Shares Registered in Your Name

If you are a holder of record and return a signed and dated proxy card or otherwise vote without marking voting selections, your shares will be voted, as applicable, “For” the election of all eightnine nominees for director, “For” the ratification of the selection of KPMG LLP as our independent registered public accounting firm for our fiscal year ending December 31, 2020,2023, “For” the advisory vote to approve named executive officer compensation, and “For” the approval of Gran Tierra’s 2007 Equity Incentive Plan, as amended.the amendment to the certificate of incorporation to effect the reverse share split. If any other matter is properly presented at the annual meeting, your proxyholder (one of the individuals named on your proxy card) will vote your shares using his or her best judgment.

Beneficial Owner; Shares Registered in the Name of a Broker or Bank

If you are a beneficial owner of shares registered in the name of your broker, bank or other nominee, and you do not provide the broker or other nominee that holds your shares with voting instructions, your broker or other nominee is not permitted to vote on certain proposals and may elect not to vote your shares on any proposal other than the ratification of the selection of KPMG LLP as our independent registered public accounting firm at the annual meeting.other proposals unless you provide voting instructions. See “What are ‘broker non-votes’?” below. We encourage you to provide voting instructions to the organization that holds your shares to ensure that your vote is counted on all threefour proposals.

Can I change my vote after submitting my proxy?

Stockholder of Record; Shares Registered in Your Name

Yes. You can revoke your proxy at any time before the final vote at the annual meeting. If you are the record holder of your shares, you may revoke your proxy in any one of the following ways:

Your most current proxy card or telephone or internet proxy is the one that is counted and must be received by 1:30 p.m.10:00 a.m. (Mountain time) on May 4, 2021,1, 2023, to be counted. The Chair of the Meeting reserves the right to accept late proxies and may waive or extend the proxy cut-off, with or without notice, but is under no obligation to accept or reject any particular late proxy.

Beneficial Owner; Shares Registered in the Name of a Broker or Bank

If your shares are held by your broker or bank as a nominee or agent, you should follow the instructions provided by your broker or bank.

QUESTIONS AND ANSWERS ABOUT THE PROXY MATERIALS AND 20212023 ANNUAL MEETING

How many votes are needed to approve each proposal?

A quorum of stockholders is necessary to hold a valid meeting. A quorum will be present if stockholders holding outstanding shares of Gran Tierra’s capital stock representing at least a majorityone-third of the total number of votes that may be cast at the annual meeting are present at the annual meeting in personvirtually or represented by proxy. On the record date, there were 366,981,556346,151,157 votes that could be cast. Thus, holders of outstanding shares representing at least 183,490,779115,268,335 votes must be present in personvirtually or represented by proxy at the annual meeting to have a quorum.

Your shares will be counted towards the quorum only if you submit a valid proxy (or one is submitted on your behalf by your broker, bank or other nominee) or if you vote in personvirtually at the annual meeting. Abstentions and broker non-votes will be counted towards the quorum requirement. If there is no quorum, the Chair of the annual meeting or the holders of a majority of shares present at the annual meeting in personvirtually or represented by proxy must adjourn the annual meeting to another date.

How can I find out the results of the voting at the annual meeting?

Preliminary voting results will be announced at the annual meeting. In addition, final voting results will be published in a current report on Form 8-K that we expect to file within four business days after the annual meeting.

What proxy materials are available on the internet?

The notice of meeting, proxy statement and annual report to stockholders are available to view at:

http://www.edocumentview.com/GTE

or

on Gran Tierra’s website at: http:https://www.grantierra.comwww.grantierra.com/investor-relations/2023-annual-meeting

See “How do I vote?” above for voting instructions.

Corporate Governance and Board Matters

PROPOSAL 1: ELECTION OF DIRECTORS

The Board of Directors is nominating the eightnine individuals identified below for election as directors. Unless you specify differently, proxies received will be voted FOR Robert B. Hodgins, Peter J. Dey, Gary S. Guidry, Evan Hazell, Alison Redford, Ronald W. Royal, Sondra Scott, David P. Smith and Brooke Wade. Each director to be elected and qualified will hold office until the next annual meeting of stockholders and until his or her successor is elected, or, if sooner, until the director’s death, resignation or removal. Each of the nominees listed below is currently a director of Gran Tierra. It is Gran Tierra’s policy to invite nominees for directors to attend the annual meeting and all of the Directors attended the 20202022 annual meeting of stockholders.

Shares represented by executed proxies will be voted, if authority to do so is not withheld, for the election of the eightnine nominees named below. If any nominee becomes unavailable for election as a result of an unexpected occurrence, shares that would have been voted for that nominee will instead be voted for the election of a substitute nominee proposed by Gran Tierra.

PROPOSAL 1: ELECTION OF DIRECTORS

THE BOARD RECOMMENDS A VOTE “FOR” EACH OF THE NOMINEES NAMED BELOW.

NOMINEES FOR DIRECTOR

		ROBERT B. HODGINS   Age: 6972 Calgary, Alberta, Canada Director since May 2015   Director and Independent DirectorBusinessman   Shareholder approval rating at the 20202022 Gran Tierra annual meeting: 96.1%93.1%

Mr. Hodgins has been ana corporate director and independent businessman since November 2004. Prior thereto, Mr. Hodgins served as the Chief Financial Officer of Pengrowth Energy Trust (a TSXToronto Stock Exchange (TSX) and NYSE-listed energy trust) from 2002 to 2004. Prior to that, Mr. Hodgins held the position of Vice President and Treasurer of Canadian Pacific Limited (a Toronto Stock Exchange (“TSX”)TSX and NYSE-listed diversified energy, transportation and hotels company) from 1998 to 2002 and was Chief Financial Officer of TransCanada PipeLines Limited (a TSX and NYSE-listed energy transportation company) from 1993 to 1998. Mr. Hodgins also served as a non-executive, part-time position of Senior Advisor, Investment Banking at Canacord Genuity Corp. At present, Mr. Hodgins serves as a director of AltaGas Ltd., EnerPlus Corporation and MEG Energy Corp. Since September 2018, Mr. Hodgins holds the position of Senior Advisor, Investment Banking at Canaccord Genuity Corp. Mr. Hodgins received an Honours Bachelor of Arts in Business from the Richard Ivey School of Business at the University of Western Ontario and received a Chartered Professional Accountant designation and was admitted as a member of the Institute of Chartered Accountants of Ontario in 1977 and Alberta in 1991. Mr. Hodgins is a member of the Institute of Corporate Directors.

Qualifications:Qualifications: With 30-plus years in the oil and gas industry as an executive and director and a strong reputation in the Canadian business community, Mr. Hodgins brings valuable industry and leadership experience to the Board. As a Chartered Professional Accountant and experienced executive in senior financial roles with several Canadian companies, Mr. Hodgins qualifies as one of Gran Tierra’s Audit Committee financial experts.

During the past five years, Mr. Hodgins previously served as a Director of the following public companies: Cub Energy Inc. (until March 2015), Kicking Horse Energy Inc. (until November 2015) and StonePoint Energy Inc. (until September 2015).

PROPOSAL 1: ELECTION OF DIRECTORS

		GARY S. GUIDRY   Age: 6567 Calgary, Alberta, Canada Director since May 2015   Non-Independent Director - President and Chief Executive Officer   Shareholder approval rating at the 20202022 Gran Tierra annual meeting: 96.3%97.2%

Mr. Guidry is a professional engineer and has more than 3540 years of experience developing and maximizing assets in the international oil and gas industry. Mr. Guidry has direct experience managing large, international projects, including assets in Latin America, Africa, the Middle-East and Asia. Prior to joining Gran Tierra, Mr. Guidry was the President and Chief Executive Officer of Caracal Energy Inc., a London Stock Exchange listed oil and gas company with operations in Chad, Africa. He held that position from mid-2011 until the company was acquired by Glencore plc for $1.8 billion in mid-2014. In 2014, Mr. Guidry was awarded the Oil Council Executive of the Year award for his leadership role with Caracal. Prior to Caracal, Mr. Guidry was the President and Chief Executive Officer of Orion Oil and Gas (TSX listed), which operated in western Canada from mid-2009 until mid-2011 when it was sold.merged. From May 2005 until December 2008, he was the President and Chief Executive Officer of Tanganyika Oil Company (TSX listed) which operated in Syria and Egypt. Prior to Tanganyika, Mr. Guidry was Chief Executive Officer of Calpine Natural Gas Trust. Mr. Guidry is an Alberta-registered Professional Engineer and a member of the Association of Professional Engineers and Geoscientists. He received a Bachelor of Science in Petroleum Engineering from Texas A&M University in 1980.

Qualifications: Mr. Guidry, as Chief Executive Officer, is responsible for the operations, financial management and implementation of the Company’s strategy. Mr. Guidry’s extensive experience in the oil and gas industry and international operations developed through his experience as a senior executive at several publicly traded companies brings valuable expertise and perspective to the Board.

During the past five years, Mr. Guidry previously served as a Director of the following public companies: Shamaran Petroleum Corp. (until June 2018) and PetroTal Corp ⁽¹⁾ (until August 2022).

During the past five years, Mr. Guidry previously served as a Director of Shamaran Petroleum Corp. (until June 2018).

PROPOSAL 1: ELECTION OF DIRECTORS

		PETER J. DEY   Age: 8082 Toronto, Ontario, Canada Director since May 2015   Independent Director   Shareholder approval rating at the 20202022 Gran Tierra annual meeting: 80.4%82.4%

Mr. Dey has been the Chairman of Paradigm Capital Inc., an investment dealer, since November 2005. Mr. Dey was a Partner of the Toronto law firm Osler, Hoskin & Harcourt LLP, where he specialized in corporate board issues and mergers and acquisitions, from 2001 to 2005, and prior to that from 1985 to 1994 and from 1973 to 1983. From 1994 to 2001, Mr. Dey was Chairman of Morgan Stanley Canada Limited. From 1993 to 1995, Mr. Dey chaired The Toronto Stock Exchange Committee on Corporate Governance in Canada that released the December 1994 report entitled “Where Were the Directors?”, known as the Dey Report and is the co-author of the recentlyreport released report:in 2021: “360 Degree Governance: Where are the Directors in a World of Crisis?”Crisis”. Mr. Dey has also served as Chairman of the Ontario Securities Commission and was Canada’s representative to the Organisation for Economic Co-operation and Development (“OECD”) Task Force that developed the OECD Principles of Corporate Governance released in May of 1999. Mr. Dey attended Queen’s University, where he earned his Bachelor of Science in 1963 and Dalhousie University, where he earned his Bachelor of Laws degree in 1966. He received his Master of Laws degree from Harvard University in 1967.

Qualifications: With more than 40 years of experience dealing with issues of corporate governance ranging from serving on public boards to private practice as a lawyer, Mr. Dey provides significant value to the board of directors of Gran Tierra.

During the past five years, Mr. Dey previously served as a Director of the following public companies:company: Guayana Goldfields Inc. (until June 2019), Goldcorp Inc. (until April 2017) and Granite REIT Inc. (until June 2017).

PROPOSAL 1: ELECTION OF DIRECTORS

		EVAN HAZELL   Age: 6264 Calgary, Alberta, Canada Director since June 2015   Independent Director   Shareholder approval rating at the 20202022 Gran Tierra annual meeting: 96.7%94.7%

Mr. Hazell has been an independent businessman since 2011. He has been involved in the global oil and gas industry for approximately 40 years, initially as a petroleum engineer and then as an investment banker. From 1998 to 2011, Mr. Hazell acted as a managing director at several financial institutions including HSBC Global Investment Bank and RBC Capital Markets. At present he serves as a director of Black SwanCourser Energy andLtd (formerly Kaisen Energy Corp. Mr. Hazell also serves as a director of a number of non-profit and community organizations including Opera America,Corp) and Pacific Opera Victoria. Mr. Hazell holds a Bachelor of Applied Science degree from Queen’s University, a Master of Engineering degree from the University of Calgary, and a Master of Business Administration degree from the University of Michigan, and is licensed as a Professional Engineer in Alberta.

Qualifications: Mr. Hazell hasbrings to the Board extensive experience in the global energy industry as well as in the financial sector. Mr. Hazell also has significant experience at nonprofit organizations. His education in business and engineering provides significant value to Gran Tierra.

During the past five years, Mr. Hazell previously served as a Director of Oryx Petroleum Corporation Limited (until June 2016).

PROPOSAL 1: ELECTION OF DIRECTORS

		ALISON M. REDFORD QC Age: 58 Calgary, Alberta, Canada Director since September 2021 Independent Director Shareholder approval rating at the 2022 Gran Tierra annual meeting: 95.8%

Ms. Redford serves as an advisor to national governments and ministries in emerging economies on regulatory reform to promote transparency and investor confidence. She provides independent advice on the creation of regulatory regimes related to climate, social and governance sustainability most recently in Pakistan, Afghanistan, South Sudan and Guyana. Separately, Ms. Redford also serves as a strategic advisor to public companies operating in volatile political climates to assess risk and ensure regulatory compliance, particularly as it relates to Extractive Industries Transparency Initiatives and Community Benefits Agreements for affected Indigenous people. Previously, Ms. Redford served as Premier of Alberta from 2011 to 2014 and as Minister of Justice and Attorney General from 2008. She graduated from the College of Law at the University of Saskatchewan (1988) and also obtained a Master of Arts degree from the School of Oriental and African Studies at the University of London (2021). Ms. Redford was appointed Queens Counsel in 2008. Ms. Redford is a holder of the Institute of Corporate Directors Director designation.

Qualifications: Ms. Redford brings to the Board more than 25 years of experience from most recently serving as an advisor to national governments and ministries in emerging economies on regulatory reform to promote transparency and investor confidence. As well as serving as Premier of Alberta, Minister of Justice and Attorney General to private practice as a lawyer, Ms. Redford provides significant value to the board of directors of Gran Tierra.

PROPOSAL 1: ELECTION OF DIRECTORS

		RONALD W. ROYAL   Age: 7173 Abbotsford, British Columbia, Canada Director since May 2015   Independent Director   Shareholder approval rating at the 20202022 Gran Tierra annual meeting: 96.7%95.8%

Mr. Royal has been an independent businessman since April 2007. Mr. Royal has more than 35 years of experience with Imperial Oil Ltd. and ExxonMobil’s international upstream affiliates. From 2011 to 2014, he served on the board of directors of Caracal Energy Inc., and prior to 2010, several other boards of private oil companies. Prior to retiring in 2007, Mr. Royal was President and Production Manager of Esso Exploration and Production Chad Inc. and resided in N’Djamena, Chad from 2002 to 2007. In 2003, he was awarded the title “Chevalier de l’Ordre National du Chad” for his contribution to the economic development of Chad. Mr. Royal received his Bachelor of Applied Science from the University of British Columbia in 1972 and completed the Executive Development Program at Cornell University in 1986. He has been a member of the Association of Professional Engineers and Geoscientists of Alberta since 1972.

Qualifications: Mr. Royal brings to the Board over 35 years of experience in senior executive roles in the oil and gas industry, having previously held a variety of management positions both domestically and internationally.

PROPOSAL 1: ELECTION OF DIRECTORS

		SONDRA SCOTT   Age: 5456 Princeton, New York, New YorkJersey Director since September 2017   Independent Director   Shareholder approval rating at the 20202022 Gran Tierra annual meeting: 97.2%93.4%

Ms. Scott is an independent businesswoman with more than 25 years of experience as an energy and risk analytics business leader. Ms. Scott is currently COOCEO of Information Clearinghouse LLC, a retail data and analytics information services company. She was formerly Chief Executive Officer for U.S. and Europe of ADEC Innovations, a leading ESG information and consulting firm where she led a team of professionals providing ESG, environmental and sustainability technical, software and strategy solutions. Prior to this, Ms. Scott was Chief Operating Officer of Verisk Financial where she iswas responsible for leading the company’s global operations team in support their range of portfolio, bankruptcy, fraud and spend solutions. Before joining Verisk Financial in 2020, Ms. Scott was President of Verisk Maplecroft, a leading risk analytics company. Prior to this, Ms. Scott filled a number of roles at Wood Mackenzie over a 13-year period. Her most recent position was head of Global Markets where she led a team focusing on macro energy economics and risk. Previously, Ms. Scott led Wood Mackenzie’s energy consultancy practice. Ms. Scott holds a Master of Science, Petroleum Engineering and Economics degree from a joint program with the University of Pennsylvania and the Institut Francais du Petrole (IFP) and received a Bachelor of Arts, Economics and Earth Sciences degree from Wesleyan University.

Qualifications: Ms. Scott hasbrings to the Board more than 25 years of experience as an energy and risk analytics business leader. She has significant leadership experience having led multi-sized global research and consultancy teams. Ms. Scott has worked in the United States, the United Kingdom, and Latin America, globalisingglobalizing businesses and building local practices.

PROPOSAL 1: ELECTION OF DIRECTORS

		DAVID P. SMITH   Age: 6264 Parry Sound, Ontario, Canada Director since May 2015   Independent Director   Shareholder approval rating at the 20202021 Gran Tierra annual meeting: 96.0%95.7%

Mr. Smith is a corporate director with extensive experience in the investment banking, investment research and management industry. He has been the Chairman of the Board of Directors of Superior Plus Corp., a diversified energy and specialty chemicals company,North American propane distributor, since August 2014.    From March 2004 to August 2015, Mr. Smith served as Chair of the Audit Committee of Superior Plus Corp. Previously, Mr. Smith was Managing Partner of Enterprise Capital Management Inc. from 1997 to 2011. Mr. Smith is a Chartered Financial Analyst and graduated with honors from the University of Western Ontario with a degree in Business Administration in 1981.

Qualifications: Mr. Smith brings to the Board significant financial expertise, having spent his professional career in investment banking, investment research and management. His experience as the Chairman at Superior Plus Corp. and his previous experience as a director and member of the audit committee of other public companies provide valuable perspective to Gran Tierra’s Board. Mr. Smith’s education and experience qualifies him as one of Gran Tierra’s Audit Committee financial experts.

PROPOSAL 1: ELECTION OF DIRECTORS

		BROOKE WADE   Age: 6769 Vancouver, British Columbia, Canada Director since June 2015   Independent Director   Shareholder approval rating at the 20202022 Gran Tierra annual meeting: 86.7%93.6%

Mr. Wade is the President of Wade Capital Corporation, a private investment company active in private equity, oil and gas, real estate and industrial businesses.businesses, and energy storage technology. From 1994 until 2005, Mr. Wade was the co-founder and Chairman and Chief Executive Officer of Acetex Corporation, a publicly traded chemical company specializing in acetyls, specialty polymers, and films. In July 2005, Acetex was acquired by Blackstone. Prior to founding Acetex Corporation, Mr. Wade was founding President and Chief Executive Officer of Methanex Corporation. In 1991, Ocelot Industries spun out its oil and gas assets and began a plan of growth through acquisition into what is today Methanex Corporation—the world’s largest methanol producer. Prior to joining Ocelot, he was involved in a number of independent business ventures. Mr. Wade serves on the boards of several private companies including Novinium, Inc., Belkin Enterprises Ltd.,Ltd.. He is also Executive Chairman of Atlas Power Technologies Inc. and is a member of the Advisory Board of Northbridge Capital Partners and is a participant of AEA Investors groups of funds. In addition, Mr. Wade is a member of the Dean’s Advisory Council of the John F.Harvard Kennedy School of Government at Harvard University.School. Mr. Wade earned a Bachelor of Commerce Degree from the University of Calgary in 1974 and received his Chartered Accountant designation in 1977. In 2012, Mr. Wade became a Fellow of the Institute of Chartered Accountants of British Columbia.

Qualifications:Qualifications: Mr. Wade’s extensive executive experience provides the Board with strong leadership and decision-making capabilities. His service on other public company boards provides Gran Tierra with public company senior executive and board member perspectives and judgment important to guiding our company.

During the past five years, Mr. Wade previously served as a Director of PKM Canada Limited, formerly, Kinder Morgan Canada Limited (until November 2019).

Majority Voting Standard

Our Bylaws provide for a majority voting standard for the election of directors in uncontested elections, which is generally defined as an election in which the number of nominees does not exceed the number of directors to be elected at the meeting. Because this is an uncontested election, each director shall be elected by the vote of a majority of the votes cast at a meeting of stockholders at which a quorum is present. A “majority of the votes cast” means that the number of shares voted “For” a director nominee must exceed the number of votes cast “Against” that director nominee. For these purposes, abstentions and broker non-votes will not count as a vote “For” or “Against” a nominee’s election and will have no effect in determining whether a director nominee has received a majority of the votes cast. If an incumbent director is not elected by a majority of the votes cast, the incumbent director must promptly tender his or her or her resignation to the Board. The Nominating and Corporate Governance Committee will make a recommendation to the Board on whether to accept or reject the director’s resignation or whether other action should be taken. The

PROPOSAL 1: ELECTION OF DIRECTORS

Nominating and Corporate Governance Committee shall recommend, and the Board of Directors’ decision shall be, to accept the