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Message to Shareholders

Gary Guidry, President and Chief Executive Officer of Gran Tierra, commented "Our portfolio in Colombia delivered strong production growth and cash flow generation during the Quarter. In 2016, we focused on transforming the portfolio by consolidating our land position in the Putumayo Basin, acquiring strategic infrastructure, and diversifying into the Middle Magdalena Valley ("MMV") Basin. In the Quarter, we are starting to see the results of this transformation. We currently are generating free cash flow from our three core fields - Costayaco, Moqueta and Acordionero - which we will continue to deploy into our exciting exploration portfolio. Despite the ongoing challenges of volatile world oil prices, we believe our low cost structure and solid production base allow us to successfully create value in a variety of pricing environments.

In the A-Limestone at the Costayaco field, we are now producing oil from three recompleted vertical wells and one horizontal well. The CYC-29, the second horizontal well targeting the A-Limestone has been successfully drilled and completed with encouraging flow test results and planned production testing about to begin. The CYC-29's estimated productivity index is approximately twice the CYC-28's productivity index. In the adjacent PUT-1 Block, we have confirmed that the Vonu-1 exploration well is a new oil discovery in the A-Limestone and U Sand. With oil productivity now established in the Costayaco field, the PUT-1 Block in the north, and the PUT-7 Block in the south of the Putumayo Basin, we believe the A-Limestone may be a basin-wide play with significant resource potential. In addition, at PUT-7, our N Sand program is back on track with both the Cumplidor-1 and Confianza-1 wells on production. We have a very strong Putumayo land position with 16 blocks and 1.1 million gross acres covering the main exploration fairways for both the A-Limestone and the N Sand oil plays, both of which will be further tested through the multiple exploration wells we plan on drilling in the second half of 2017 and throughout 2018 and 2019.

In the Middle Magdalena Valley ("MMV") Basin, the Acordionero field continues to exceed our expectations where our continuous development drilling program has delivered four more oil wells which are all now on production. Since acquiring the MMV Basin properties August 23, 2016, we have been able to reduce average drilling costs per well by $1.3 million (33% reduction) as well as drilling times (28% reduction), with our best well so far taking only 25 days from spud to onstream. When we acquired these assets last year, the MMV Basin fields were producing 5,620 BOEPD and now, approximately 11 months later, the fields are producing 11,958 BOEPD. Also, since the acquisition, the MMV Basin properties have generated $59 million of operating netback while we incurred $42 million of capital expenditures, as of June 30, 2017.

Our strong Quarter financial performance is demonstrated by the fact that, notwithstanding a net loss of $7 million, which includes a $9 million loss on the sale of the Brazil business, funds flow from operations was up 13% relative to the Prior Quarter to $51 million, and covered 88% of the Company's capital expenditures in the Quarter of $58 million. The increase in funds flow from operations was due to lower current income and equity taxes, partially offset by lower operating netbacks commensurate with the decrease in oil price. During the Quarter, we repurchased 4 million common shares of Gran Tierra stock pursuant to our previously announced normal course issuer bid.

Despite delays in production start ups for the CYC-28 and 29 A-Limestone horizontal wells in the Costayaco field, and the Cumplidor-1 N Sand well in the PUT-7 Block, strong production growth at Acordionero allowed Gran Tierra's total WI production before royalties for second quarter 2017 to average 31,437 BOEPD, which was 5% higher compared to 29,879 BOEPD in the Prior Quarter.

Gran Tierra's strong financial and production performance in second quarter 2017 reaffirms our plans over the next three years to deliver visible organic reserves and production growth and to drill a total of 30 to 35 exploration wells, with all of this activity expected to be funded from cash flows from operations."

Financial and Operational Highlights (all amounts in $000s, except per share and BOE amounts)

⁽¹⁾ Operating netbacks, earnings before interest, taxes, depletion, depreciation, accretion and impairment ("DD&A") ("EBITDA"), funds flow from operations and cash netbacks are non-GAAP measures and do not have a standardized meaning under generally accepted accounting principles in the United States of America ("GAAP"). Refer to "Non-GAAP Measures" in this press release for descriptions of these non-GAAP measures and reconciliations to the most directly comparable measures calculated and presented in accordance with GAAP.

⁽²⁾ Per BOE amounts are based on WI sales before royalties. For per BOE amounts based on NAR production, see Gran Tierra's Quarterly Report on Form 10-Q filed August 3, 2017.

Conference Call Information:

Gran Tierra Energy Inc. will host its second quarter 2017 results conference call on Friday, August 4, 2017. Details of the conference call are as follows:

Interested parties may also access the live webcast on the investor relations page of Gran Tierra's website at www.grantierra.com. An archive of the webcast will be available on Gran Tierra's website until August 11, 2017. In addition, an audio replay of the conference call will be available following the call until August 8, 2017. To access the replay, dial toll-free 1-855-859-2056 (North America), or 1-404-537-3406 (outside of Canada and USA), conference ID: 57318699.

About Gran Tierra Energy Inc.

Gran Tierra Energy Inc. together with its subsidiaries is an independent international energy company focused on oil and natural gas exploration and production in Colombia. The Company also has business activities in Peru. The Company is focused on its existing portfolio of assets in Colombia and will pursue new growth opportunities throughout Colombia, leveraging our financial strength. The Company's common shares trade on the NYSE American and the Toronto Stock Exchange under the ticker symbol GTE. Additional information concerning Gran Tierra is available at www.grantierra.com. Information on the Company's website does not constitute a part of this press release. Investor inquiries may be directed to info@grantierra.com or (403) 265-3221.

Gran Tierra's Securities and Exchange Commission filings are available on a website maintained by the Securities and Exchange Commission at www.sec.gov and on SEDAR at www.sedar.com.

Forward Looking Statements and Legal Advisories:

This press release contains opinions, forecasts, projections, and other statements about future events or results that constitute forward-looking statements within the meaning of the United States Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and financial outlook and forward looking information within the meaning of applicable Canadian securities laws (collectively, "forward-looking statements"). Such forward-looking statements include, but are not limited to, Gran Tierra's committed borrowing base, anticipated drilling efficiencies, the Company's expectations and guidance, the Company's strategies, the Company's operations including planned operations, the Company's ability to succeed in a variety of pricing environments, the base capital program, the allocation of capital, the exploration and development of certain blocks and fields, production growth or estimates and drilling plans including trends, infrastructure schedules, the expected timing of certain projects and how such drilling plans will be financed.

The forward-looking statements contained in this press release reflect several material factors and expectations and assumptions of Gran Tierra including, without limitation, that Gran Tierra will continue to conduct its operations in a manner consistent with its current expectations, the accuracy of testing and production results and seismic data, pricing and cost estimates (including with respect to commodity pricing and exchange rates), rig availability, the effects of drilling down-dip, the effects of waterflood and multi-stage fracture stimulation operations, the extent and effect of delivery disruptions, and the general continuance of current or, where applicable, assumed operational, regulatory and industry conditions including in areas of potential expansion, and the ability of Gran Tierra to execute its current business and operational plans in the manner currently planned. Gran Tierra believes the material factors, expectations and assumptions reflected in the forward-looking statements are reasonable at this time but no assurance can be given that these factors, expectations and assumptions will prove to be correct.

Among the important factors that could cause actual results to differ materially from those indicated by the forward-looking statements in this press release are: sustained or future declines in commodity prices; potential future impairments and reductions in proved reserve quantities and value; Gran Tierra's operations are located in South America, and unexpected problems can arise due to guerilla activity; technical difficulties and operational difficulties may arise which impact the production, transport or sale of our products; geographic, political and weather conditions can impact the production, transport or sale of our products; the risk that current global economic and credit conditions may impact oil prices and oil consumption more than Gran Tierra currently predicts; the ability of Gran Tierra to execute its business plan; the risk that unexpected delays and difficulties in developing currently owned properties may occur; the timely receipt of regulatory or other required approvals for our operating activities; the failure of exploratory drilling to result in commercial wells; unexpected delays due to the limited availability of drilling equipment and personnel; the risk that oil prices could continue to fall, or current global economic and credit market conditions may impact oil prices and oil consumption more than Gran Tierra currently predicts, which could cause Gran Tierra to further modify its strategy and capital spending program; and the risk factors detailed from time to time in Gran Tierra's periodic reports filed with the Securities and Exchange Commission, including, without limitation, under the caption " Risk Factors" in Gran Tierra's Annual Report on Form 10-K filed March 1, 2017 and its Quarterly Reports. These filings are available on the Web site maintained by the Securities and Exchange Commission at www.sec.gov and on SEDAR at www.sedar.com. Although the current capital spending program and long term strategy of Gran Tierra is based upon the current expectations of the management of Gran Tierra, should any one of a number of issues arise, Gran Tierra may find it necessary to alter its business strategy and/or capital spending program and there can be no assurance as at the date of this press release as to how those funds may be reallocated or strategy changed.

All forward-looking statements are made as of the date of this press release and the fact that this press release remains available does not constitute a representation by Gran Tierra that Gran Tierra believes these forward-looking statements continue to be true as of any subsequent date. Actual results may vary materially from the expected results expressed in forward-looking statements. Gran Tierra disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as expressly required by applicable securities laws. Gran Tierra's forward-looking statements are expressly qualified in their entirety by this cautionary statement.

The estimates of future production set forth in this press release may be considered to be future-oriented financial information or a financial outlook for the purposes of applicable Canadian securities laws. Financial outlook and future-oriented financial information contained in this press release about prospective financial performance, financial position or cash flows are based on assumptions about future events, including economic conditions and proposed courses of action, based on management's assessment of the relevant information currently available, and to become available in the future. In particular, this press release contains projected operational information for 2017 average WI production and fourth quarter 2017 average WI production. These projections contain forward-looking statements and are based on a number of material assumptions and factors set out above. Actual results may differ significantly from the projections presented herein. These projections may also be considered to contain future-oriented financial information or a financial outlook. The actual results of Gran Tierra's operations for any period could vary from the amounts set forth in these projections, and such variations may be material. See above for a discussion of the risks that could cause actual results to vary. The future-oriented financial information and financial outlooks contained in this press release have been approved by management as of the date of this press release. Readers are cautioned that any such financial outlook and future-oriented financial information contained herein should not be used for purposes other than those for which it is disclosed herein. The Company and its management believe that the prospective financial information has been prepared on a reasonable basis, reflecting management's best estimates and judgments, and represent, to the best of management's knowledge and opinion, the Company's expected course of action. However, because this information is highly subjective, it should not be relied on as necessarily indicative of future results.

Non-GAAP Measures

This press release includes non-GAAP financial measures as further described herein. These non-GAAP measures do not have a standardized meaning under GAAP. Investors are cautioned that these measures should not be construed as alternatives to net income or loss or other measures of financial performance as determined in accordance with GAAP. Gran Tierra's method of calculating these measures may differ from other companies and, accordingly, they may not be comparable to similar measures used by other companies. Each non-GAAP financial measure is presented along with the corresponding GAAP measure so as not to imply that more emphasis should be placed on the non-GAAP measure.

Operating netback as presented is oil and gas sales net of royalties and operating and transportation expenses. Cash netback as presented is net income or loss before DD&A expenses, asset impairment, deferred income tax recovery, amortization of debt issuance costs, unrealized foreign exchange gains and losses, loss on sale of Brazil business unit, gain on acquisition, non-cash operating and G&A expenses and unrealized financial instruments gains and losses. Management believes that operating and cash netback are useful supplemental measures for investors to analyze financial performance and provide an indication of the results generated by Gran Tierra's principal business activities prior to the consideration of other income and expenses. See the table entitled Financial and Operational Highlights, above for the components of operating netback. A reconciliation from net loss to cash netback is as follows:

EBITDA, as presented, is net income or loss adjusted for depletion, depreciation and accretion ("DD&A") expenses, asset impairment, interest expense and income tax recovery or expense. Management uses these financial measures to analyze performance and income or loss generated by our principal business activities prior to the consideration of how non-cash items affect that income or loss, and believes that these financial measures are also useful supplemental information for investors to analyze performance and our financial results. A reconciliation from net income or loss to EBITDA is as follows:

Funds flow from operations, as presented, is net income or loss adjusted for DD&A expenses, asset impairment, deferred tax expense or recovery, stock-based compensation expense, amortization of debt issuance costs, cash settlement of RSUs, unrealized foreign exchange gains and losses, financial instruments gains, cash settlement of financial instruments, loss on sale of Brazil business unit and gain on acquisition. Management uses this financial measure to analyze performance and income or loss generated by our principal business activities prior to the consideration of how non-cash items affect that income or loss, and believes that this financial measure is also useful supplemental information for investors to analyze performance and our financial results. A reconciliation from net income or loss to funds flow from operations is as follows:

Presentation of Oil and Gas Information

BOEs have been converted on the basis of 6 thousand cubic feet ("Mcf") of natural gas to 1 barrel of oil. BOEs may be misleading, particularly if used in isolation. A BOE conversion ratio of 6 Mcf: 1 barrel is based on an energy equivalency conversion method primarily applicable at the burner tip and does not represent a value equivalency at the wellhead. In addition, given that the value ratio based on the current price of oil as compared with natural gas is significantly different from the energy equivalent of six to one, utilizing a BOE conversion ratio of 6 Mcf: 1 barrel would be misleading as an indication of value.

This press release contains certain oil and gas metrics, including operating netback and cash netback, which do not have standardized meanings or standard methods of calculation and therefore such measures may not be comparable to similar measures used by other companies. Such metrics have been included herein to provide readers with additional measures to evaluate the Company's performance; however, such measures are not reliable indicators of the future performance of the Company and future performance may not compare to the performance in previous periods.

Investors are urged to consider closely the disclosures and risk factors in the Company's Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and in the other reports and filings with the SEC, available on the Company's website at www.grantierra.com. These forms can also be obtained from the SEC website at www.sec.gov or by calling 1-800-SEC-0330.