Exhibit 99.1

Extractive Sector Transparency Measures Act - Annual Report
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Reporting Entity NameGran Tierra Energy Inc.
Reporting YearFrom:1/1/2025To:12/31/2025Date Submitted5/29/2026
Reporting Entity ESTMA Identification NumberE742342● Original Submission
○ Amended Report
Other Subsidiaries Included (optional field)
Not Consolidated
Not Substituted
Attestation by Reporting Entity
In accordance with the requirement of the ESTMA, and in particular section 9 thereof, I attest I have reviewed the information contained in the ESTMA report for the entity(ies) listed above. Based on my knowledge, and having exercised reasonable diligence, the information in the ESTMA report is true, accurate and complete in all material respects for the purposes of the Act, for the reporting year listed above.
Full Name of Director or Officer of Reporting EntityRyan EllsonDate5/29/2026
Position TitleChief Financial Officer and Executive Vice President





Extractive Sector Transparency Measures Act- Annual Report
Reporting YearFrom:2025-01-01To: 2025-12-31
Reporting Entity NameGran Tierra Energy Inc. Currency of the ReportUSD
Reporting entity ESTMA Identification NumberE742342
Subsidiary Reporting Entities (if necessary)
Payments by Payee
CountryPayee NameDepartments. Agency, etc… within Payee that Received PaymentsTaxesRoyaltiesFeesProduction Entitlements BonusesDividendsInfrastructure Improvement PaymentsTotal Amount paid to PayeeNotes
ColombiaNATIONAL GOVERNMENT OF COLOMBIANATIONAL HYDROCARBON AGENCY OF COLOMBIA74,057,067 74,057,067 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaNATIONAL GOVERNMENT OF COLOMBIADIRECTORATE OF NATIONAL TAXES AND CUSTOMS OF COLOMBIA2,138,719 2,138,719 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaNATIONAL GOVERNMENT OF COLOMBIA1,067,224 1,067,224 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaMUNICIPALITY OF PUERTO ASIS574,234 127,569 701,803 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaMUNICIPALITY OF SAN MARTIN439,523 192,525 632,048 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaMUNICIPALITY OF VILLAGARZON375,072 3,278 378,350 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053


ColombiaDISTRICT OF BOGOTA349,745 349,745 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaMUNICIPALITY OF MOCOA227,657 96,622 324,279 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaMUNICIPALITY OF RIO DE ORO147,523 59,573 207,096 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaMUNICIPALITY OF PIAMONTE147,454 52,292 199,746 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaMUNICIPALITY OF PUERTO GUZMAN147,454 147,454 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaGOVERNMENT OF PUTUMAYO   95,785 95,785 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaMUNICIPALITY OF ORITO63,226 14,523 77,749 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaINDIGENOUS COMMUNITY OF CABILDO AWA77,050 77,050 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
EcuadorGOVERNMENT OF ECUADORSECRETARIAT OF HIGHER EDUCATION, SCIENCE, TECHNOLOGY AND INNOVATION191,233 191,233 Paid in USD


EcuadorGOVERNMENT OF ECUADORMINISTRY OF ENERGY AND NON-RENEWABLE NATURAL RESOURCES OF ECUADOR457,000 457,000 Paid in USD
EcuadorGOVERNMENT OF ECUADORCENTRAL BANK OF ECUADOR36,238,959 36,238,959 Paid in USD
EcuadorGOVERNMENT OF ECUADORINTERNAL REVENUE SERVICE1,998,128 1,998,128 Paid in USD
EcuadorDECENTRALIZED AUTONOMOUS MUNICIPAL GOVERNMENT OF QUITOFINANCIAL MANAGEMENT200,398 200,398 Paid in USD
EcuadorSUPERINTENDENCY OF COMPANIES, SECURITIES, AND INSURANCEFINANCIAL MANAGEMENT188,159 188,159 Paid in USD
CanadaGOVERNMENT OF ALBERTAALBERTA ENERGY AND MINERALS3,459,968 607,773 4,067,741 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Paid $3,441,274 AB Crown Royalty Gas & Liquids Net of GCA - G94167206 A8HW and $18,694 Compensatory Royalty. $607,773 fees include Surface & Mineral Lease Rentals
CanadaGOVERNMENT OF ALBERTAFORESTRY AND PARKS1,533 1,533 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978.
CanadaGOVERNMENT OF ALBERTASERVICE ALBERTA LAND TITLES12,261 12,261 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978.
CanadaALBERTA BOILERS SAFETY ASSOCIATION60,660 60,660 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Facility Licence Fee


CanadaGOVERNMENT OF ALBERTAWESTERN CANADA SPILL SERVICE8,581 8,581 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Well and Facility Fee
CanadaGOVERNMENT OF CANADAINNOVATION, SCIENCE AND ECONOMIC DEVELOPMENT, CANADA11,875 11,875 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Radio Licence Fee
CanadaGOVERNMENT OF CANADA1,089,281 1,089,281 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Corporate Federal Income Tax instalments and Part XIII Non-Resident Tax.
CanadaGOVERNMENT OF ALBERTAALBERTA PETROLEUM MARKETING COMMISSION8,674,552 8,674,552 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Oil paid in-kind royalties, carried by GTE. The value of in-kind payments was determined using the prevailing commodity prices at the time of transfer.
CanadaGOVERNMENT OF ALBERTAOIL SANDS ADMINISTRATION AND STRATEGIC INFORMATION SYSTEM132,026 132,026 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978.
CanadaGOVERNMENT OF ALBERTAALBERTA ENERGY FREEHOLD MINERAL TAX SECTION233,592 233,592 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Freehold Mineral Tax.
CanadaGOVERNMENT OF ALBERTAALBERTA DEPARTMENT OF ENERGY2,792,676 2,792,676 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Alberta Crown Land Sale.
CanadaGOVERNMENT OF ALBERTAALBERTA ENERGY REGULATOR1,629,270 1,629,270 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Fees include Orphan Levy $831,812.20 & Provincial Admin $789,659.81 & Core Analysis $7,798
CanadaGOVERNMENT OF ALBERTAALBERTA FINANCE CORPORATE INCOME TAX SECTION904,662 904,662 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Alberta Income Tax instalments.


CanadaGOVERNMENT OF ALBERTAALBERTA ENVIRONMENT AND PROTECTED AREAS18,511 18,511 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Carbon Credit Purchases
CanadaMUNICIPAL DISTRICT OF GREENVIEW No 16637,931 637,931 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaCLEARWATER COUNTY548,223 548,223 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaCLEAR HILLS COUNTY177 177 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaTOWN OF SEXSMITH37,872 37,872 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaMUNICIPAL DISTRICT OF LESSER SLAVE RIVER12,463 12,463 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaCOUNTY OF WETASKIWIN No. 10476,285      476,285 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaYELLOWHEAD COUNTY52,023 52,023 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaPONOKA COUNTY1,778,650 1,778,650 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.


CanadaLETHBRIDGE COUNTY121,142 121,142 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaRED DEER COUNTY14,505 14,505 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaCOUNTY OF GRANDE PRAIRIE No. 142,497 42,497 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaTOWN OF SYLVAN LAKE5,557 5,557 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaBRAZEAU COUNTY362,268 362,268 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaVULCAN COUNTY52,010 52,010 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaLACOMBE COUNTY384,574 384,574 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaCOUNTY OF STETTLER No. 631,141 31,141 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaMUNICIPAL DISTRICT OF OPPORTUNITY No. 171,683 1,683 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.


CanadaNORTHERN SUNRISE COUNTY296 296 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property Taxes.
CanadaPROVINCE OF BRITISH COLUMBIA68,957 12,233 81,190 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. BCOG Levy + Lease Rentals + Property Tax = $12,233. BC Crown Royalty $68,957
CanadaINDIAN OIL AND GAS CANADA53,978 1,747 55,725 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. $53,978 IOGC - Royalty and $1.747 Lease Rentals
CanadaWOODLAND CREE FIRST NATION6,081 6,081 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Surface lease Costs
CanadaGOVERNMENT OF CANADACANADA REVENUE AGENCY766,919 766,919 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Income tax
United States of AmericaSTATE OF DELAWARE 250,970 250,970 Paid in USD
Additional Notes:Royalties include royalties in-kind for $69,481,049 for Colombia, $33,630,314 for Ecuador, and $12,389,481 for Canada calculated using royalty volumes multiplied by 2025 average realized price of $56.54 per boe for Colombia, $61.53 per boe for Ecuador, and $21.71 per boe for Canada.









Extractive Sector Transparency Measures Act- Annual Report
Reporting YearFrom:2025-01-01To:2025-12-31
Reporting Entity NameGran Tierra Energy Inc.Currency of the Report USD
Reporting Entity ESTMA Identification NumberE742342
Subsidiary Reporting Entities (if necessary)
Payments by Project
CountryProject NameTaxesRoyaltiesFeesProduction EntitlementsBonusesDividendsInfrastructure Improvement PaymentsTotal Amount paid by ProjectNotes
ColombiaMIDDLE MAGDALENA BASIN587,047 44,344,678 435,591 252,097 45,619,413 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaPUTUMAYO BASIN1,535,096 29,105,060 483,618 390,070 31,513,844 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaENTITY WIDE2,488,464 111,204 2,599,668 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaLLANOS BASIN607,329 86,373 693,702 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaSINU BASIN10,348 10,348 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaCATATUMBO BASIN8,744 8,744 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053
ColombiaLOWER MAGDALENA BASIN8,396 8,396 Paid in Colombian Pesos. Translated at the 2025 average foreign exchange rate of 4,053


Extractive Sector Transparency Measures Act- Annual Report
EcuadorCHANANGUE BLOCK10,412,472 312,205 10,724,677 Paid in USD
EcuadorCHARAPA BLOCK18,358,758 195,000 18,553,758 Paid in USD
EcuadorENTITY WIDE (GRAN TIERRA ENERGY COLOMBIA GMBH)2,386,685 2,386,685 Paid in USD
EcuadorIGUANA BLOCK6,964,800 141,028 7,105,828 Paid in USD
EcuadorPERICO BLOCK502,929 502,929 Paid in USD
CanadaCENTRAL AREA3,843,939 9,939,085 4,419,617 18,202,641 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property taxes, royalties, land fees, IOGC, freehold mineral taxes and Crown land sale.
CanadaOTHER325,747 146,540 184,465 656,752 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property taxes, royalties and land fees and Minister of Finance BC.
CanadaSIMONETTE AREA279,825 570,619 166,131 1,016,575 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property taxes, royalties and land fees.
CanadaWAPITI AREA328,976 1,601,211 213,286 2,143,473 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property taxes, royalties and land fees.


Extractive Sector Transparency Measures Act- Annual Report
CanadaCLEARWATER AREA14,442 132,026 149,316 295,784 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Property taxes, oil sands royalties and land fees.
CanadaENTITY WIDE (GRAN TIERRA CANADA LTD.)2,012,414 11,875 2,024,289 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. CRA tax instalments, Alberta tax instalments & Radio Licence Fee
CanadaENTITY WIDE (GTE ALBERTA INC.)766,919 766,919 Amounts paid in Canadian Dollars translated at the 2025 average foreign exchange rate of 1.3978. Income tax
United States of AmericaENTITY WIDE (GRAN TIERRA ENERGY INC.)250,970 250,970 Paid in USD
Additional Notes: Royalties include the following amounts of royalties in-kind: $42,656,754 for Middle Magdalena Basin, $26,422,662 for Putumayo Basin and $401,633 for Llanos Basin in Colombia and $9,565,545 for Chanangue Block, $17,038,846 for Charapa Block, $6,522,993 for Iguana Block, and $502,929 for Perico Block in Ecuador. Royalties in-kind were calculated using royalty volumes multiplied by 2025 average realized price of $56.54 per barrel for Colombia and $61.53 per barrel in Ecuador. All royalties in Canada were paid in-kind, calculated using an average realized price of $21.71.