Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
(Amendment No.     )

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o Preliminary Proxy Statement

o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

o Definitive Proxy Statement

x Definitive Additional Materials

o Soliciting Material Pursuant to § 240.14a-12

Gran Tierra Energy Inc.
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement if other than the Registrant)

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  Step 1: Go to Step 2: After you have viewed the materials, click on Cast Your Vote or Request Materials. Step 3: Return to the window and follow the instructions on the screen to log in. Vote by Internet Go to Or scan the QR code with your smartphone Follow the steps outlined on the secure website 01U98A   Important Notice Regarding the Availability of Proxy Materials for the Gran Tierra Energy Inc. Stockholder Meeting to be Held on June 25, 2014 As permitted by the Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the 2014 annual stockholders’ meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the annual meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The Notice & Proxy Statement and Annual Report are available at: _ Easy Online Access — A Convenient Way to View Proxy Materials and Vote When you go online to view materials, you can also vote your shares. Step 4: Make your selection as instructed on each screen to select delivery preferences and vote. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials – If you want to receive a copy of these documents, you must request one. There is no charge to you for requesting a copy. Please make your request for a copy as instructed on the reverse side on or before June 16, 2014 to facilitate timely delivery. . IMPORTANT ANNUAL MEETING INFORMATION Annual Stockholder Meeting Notice Here’s how to order a copy of the proxy materials and select a future delivery preference: Paper copies: Current and future paper delivery requests can be submitted via the telephone, Internet or email options below. Email copies: Current and future email delivery requests must be submitted via the Internet following the instructions below. If you request an email copy of current materials you will receive an email with a link to the materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a set of proxy materials. g Internet – Go to Follow the instructions to log in and order a copy of the current meeting materials and submit your preference for email or paper delivery of future meeting materials. g Telephone – Call Computershare free of charge at 1-866-641-4276 and follow the instructions to log in and order a paper copy of the materials by mail for the current meeting. You can also submit a preference to receive a paper copy for future meetings. g Email – Send an email to with “Proxy Materials Gran Tierra Energy Inc.” in the subject line. Include in the message your full name and address, plus the number located in the shaded bar on the reverse, and state in the email that you want a paper copy of current meeting materials. You can also state your preference to receive a paper copy for future meetings. To facilitate timely delivery, all requests for a paper copy of the proxy materials must be received by June 16, 2014. . Gran Tierra Energy Inc.’s Annual Meeting of Stockholders will be held on June 25, 2014 at the Calgary Petroleum Club, 319 Fifth Avenue S.W., Calgary, Alberta, at 3:00 p.m. (Calgary time). For directions to the meeting, please visit Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations. The Board of Directors recommends a vote FOR all the nominees listed and FOR Proposals 2 and 3: 1. Election of Directors. Nominees: 01 - Dana Coffield, 02 - Jeffrey Scott, 03 - Verne Johnson, 04 - Nicholas G. Kirton, 05 - J. Scott Price and 06 - Gerald Macey. 2. Proposal to approve, on an advisory basis, the compensation of Gran Tierra's named executive officers, as disclosed in the proxy statement. 3. Proposal to ratify the selection by the Audit Committee of the Board of Directors of Deloitte LLP as the independent registered public accounting firm of Gran Tierra Energy Inc. for its fiscal year ending December 31, 2014. PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must vote online or request a paper copy of the proxy materials to receive a proxy card. If you wish to attend and vote at the meeting, please bring this notice with you. 01U98A Stockholder Meeting Notice