Company Formally Celebrates its Listing on the Exchange CALGARY, Alberta, April 21 /PRNewswire-FirstCall/ -- Gran Tierra Energy Inc. (Amex: GTE; TSX: GTE), a company focused on oil exploration and production in South America, today announced that the company will be ringing the opening bell of the American Stock Exchange (AMEX) on Thursday April 24, 2008, formally commemorating its April 8th listing on the Exchange. "This is an exciting time for Gran Tierra Energy," commented Dana Coffield, Chief Executive Officer of Gran Tierra Energy Inc. "Our listing on the American Stock Exchange is a significant achievement for our company resulting from the cumulative efforts of virtually every individual in our organization. I am very proud of each and every one of our team members for helping to transform Gran Tierra Energy into the company it is today. In addition to increasing the company's exposure to a broader investing audience, we believe that our AMEX listing will help to improve liquidity and provide us with greater flexibility as we execute our plans to drive top and bottom line growth. This is a win for all parties associated with Gran Tierra Energy." About Gran Tierra Energy Inc.: Gran Tierra Energy Inc. is an international oil and gas exploration and production company operating in South America, headquartered in Calgary, Canada, incorporated in the United States, and trading on the American Stock Exchange (GTE) and the Toronto Stock Exchange (GTE). The company holds interests in producing and prospective properties in Argentina, Colombia and Peru. The company has a strategy that focuses on growing a portfolio of producing properties, plus production enhancement and exploration opportunities to provide a base for future growth. Additional information concerning Gran Tierra Energy is available at http://www.grantierra.com/. Investor inquiries may be directed to or 1-800-916-GTRE (4873). Forward Looking Statements: The statements in this news release regarding Gran Tierra Energy's plans and expectations for increased stock liquidity, the company's ability to execute its business plan, and potential increases to top and bottom line growth are forward looking information, forward looking statements or financial outlooks (collectively, "forward-looking statements") under the meaning of applicable securities laws, including Canadian Securities Administrators' National Instrument 51-102 Continuous Disclosure Obligations and the United States Private Securities Litigation Reform Act of 1995. These forward-looking statements are subject to risks, uncertainties and other factors that could cause actual results or outcomes to differ materially from those contemplated by the forward-looking statements. Although, Gran Tierra Energy believes that the assumptions underlying, and expectations reflected in, these forward-looking statements are reasonable, it can give no assurance that these assumptions and expectations will prove to be correct. Important factors that could cause the results or outcomes discussed herein to differ materially from those indicated by these forward-looking statements, include, among other things: Gran Tierra Energy's operations are located in South America, and unexpected problems can arise due to guerilla activity, technical difficulties and operational difficulties which impact the production, transport or sale of its products, and geographic, political and weather conditions; and the usefulness of the seismic data and benefits of the discovery of the oil-water contact may be different than Gran Tierra Energy predicts. Further information on potential factors that could affect Gran Tierra are included in risks detailed from time to time in Gran Tierra's Securities and Exchange Commission filings, including, without limitation, under the caption "Item 1A - Risk Factors" in Gran Tierra's Annual Report on Form 10-K for the period ended December 31, 2007, filed with the Securities and Exchange Commission on March 14, 2008. These filings are available on a Web site maintained by the Securities and Exchange Commission at http://www.sec.gov/. The forward-looking statements contained herein are made as at the date of this press release. Gran Tierra does not undertake an obligation to update forward-looking or other statements in this release. Gran Tierra's forward-looking statements are expressly qualified in their entirety by this cautionary statement. DATASOURCE: Gran Tierra Energy Inc. CONTACT: Dana Coffield, President & Chief Executive Officer of Gran Tierra Energy, Inc., 1-800-916-4873, ; or Al Palombo, Investor Relations of Cameron Associates, +1-212-245-8800, Ext. 209, , for Gran Tierra Energy Inc. Web site: http://www.grantierra.com/

Copyright