<div id="readability-page-1"><div>RNS Number : 2544C Gran Tierra Energy Inc. 06 October 2025 October 6, 2025Gran Tierra Energy Inc.(the &#34;Company&#34;)Notification of Transactions in the Company's Shares by Directors and Persons Discharging Managerial ResponsibilityThe Company announces the following transactions in the Company's common shares undertaken by directors / persons discharging managerial responsibility (&#34;PDMRs&#34;).The notification set out below is provided in accordance with the requirement of Article 19 of the EU Market Abuse Regulation.Contact Information:Gary GuidryPresident and Chief Executive OfficerRyan EllsonExecutive Vice President and Chief Financial OfficerPhillip AbrahamExecutive Vice President, Legal and Land and Corporate Secretary(403) 265-3221info@grantierra.com<div><table><tbody><tr><td>1</td><td colspan="2">Details of the person discharging managerial responsibilities / person closely associated</td></tr><tr><td>a)</td><td>Name</td><td>Gary Guidry, President and Chief Executive OfficerSebastien Morin, Chief Operating OfficerJim Evans, Executive Vice President, Corporate ServicesPhillip Abraham, Executive Vice President, Legal and Land</td></tr><tr><td>2</td><td colspan="2">Reason for the notification</td></tr><tr><td>a)</td><td>Position/status</td><td>See 1 a) above</td></tr><tr><td>b)</td><td>Initial notification /Amendment</td><td>Initial notification</td></tr><tr><td>3</td><td colspan="2">Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor</td></tr><tr><td>a)</td><td>Name</td><td>Gran Tierra Energy Inc.</td></tr><tr><td>b)</td><td>LEI</td><td>549300IH2S17MAIUCM32</td></tr><tr><td>4</td><td colspan="2">Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted</td></tr><tr><td>a)</td><td>Description of the financial instrument, type of instrument</td><td>Common Shares</td></tr><tr><td></td><td>Identification code</td><td>ISIN: US38500T2006</td></tr><tr><td>b)</td><td>Nature of the transaction</td><td>Acquisition of Common Shares through the Company's Employee Share Savings Plan</td></tr><tr><td>c)</td><td>Price(s) and volume(s)</td><td><div><table><tbody><tr><td>PDMR</td><td>Gary GuidrySebastien MorinJim EvansPhillip Abraham</td></tr><tr><td>Price(s)</td><td>USD 4.35USD 4.35USD 4.35USD 4.35</td></tr><tr><td>Volume (s)</td><td>962687309550</td></tr></tbody></table></div></td></tr><tr><td>d)</td><td>Aggregated information- Aggregated volume- Price</td><td><div><table><tbody><tr><td>Price(s)</td><td>Volume (s)</td></tr><tr><td>USD 4.35</td><td>2,508</td></tr></tbody></table></div></td></tr><tr><td>e)</td><td>Date of the transaction</td><td>October 1, 2025</td></tr><tr><td>f)</td><td>Place of the transaction</td><td>Toronto Stock Exchange (TSX) </td></tr></tbody></table></div>This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact rns@lseg.com or visit www.rns.com.RNS may use your IP address to confirm compliance with the terms and conditions, to analyse how you engage with the information contained in this communication, and to share such analysis on an anonymised basis with others as part of our commercial services. For further information about how RNS and the London Stock Exchange use the personal data you provide us, please see our Privacy Policy. END DSHFLFIEIVLRIIE</div></div>

Gran Tierra Energy Inc. announced transactions in its common shares by directors and persons discharging managerial responsibility (PDMRs) on October 1, 2025. The transactions involved the acquisition of common shares through the Company's Employee Share Savings Plan at a price of USD 4.35 per share. Notable PDMRs included Gary Guidry, Sebastien Morin, Jim Evans, and Phillip Abraham, with a total volume of 2,508 shares acquired. This notification complies with Article 19 of the EU Market Abuse Regulation.

REG - Gran Tierra Energy - Director/PDMR Shareholding