Gran Tierra Energy Set to Join Russell 3000 Index

    Growth in Market Capitalization Results in Index Listing

    CALGARY, Alberta, June 19 /CNW/ -- Gran Tierra Energy Inc. (Amex:   GTE;
TSX: GTE), a company focused on oil exploration and production in South
America, today announced that it is set to join the broad-market Russell
3000(R) Index when Russell Investments reconstitutes its comprehensive set of
U.S. and global equity indexes on June 27, according to a preliminary list of
additions posted June 13 on
    Commenting on the matter, Dana Coffield, President and Chief Executive
Officer of Gran Tierra Energy Inc. stated, "Inclusion in the Russell 3000(R)
Index reflects the success of our Company.  Our oil exploration and
development programs have resulted in reserves, production and cash flow
growth over the last year and a half, resulting in a material growth in our
market capitalization during that period."
    Annual reconstitution of Russell's U.S. indexes captures the 4,000
largest U.S. stocks as of the end of May, ranking them by total market
capitalization. Membership in the Russell 3000, which remains in place for one
year, means automatic inclusion in the large-cap Russell 1000(R) Index or
small-cap Russell 2000(R) Index as well as the appropriate growth and value
style indexes. Russell determines membership for its equity indexes primarily
by objective, market-capitalization rankings and style attributes.
    The Russell 3000 also serves as the U.S. component to the Russell Global
Index, which Russell launched last year.
    Russell indexes are widely used by investment managers and institutional
investors for index funds and as benchmarks for both passive and active
investment strategies. An industry-leading $4.4 trillion in assets currently
are benchmarked to them. These investment tools originated from Russell's
multi-manager investment business in the early 1980s when the company saw the
need for a more objective, market-driven set of benchmarks in order to
evaluate outside investment managers.
    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
Investor inquiries may be directed to or 1-800-916-GTRE


     Dana Coffield                           Al Palombo
     Gran Tierra Energy, Inc.                Cameron Associates
     President & Chief Executive Officer     Investor Relations
     (800) 916-4873                          (212) 245-8800 Ext. 209           

For further information:

For further information: Dana Coffield, President & Chief Executive 
Officer of Gran Tierra Energy, Inc., 1-800-916-4873,; or 
Investor Relations, Al Palombo of Cameron Associates, +1-212-245-8800, ext.
209,, for Gran Tierra Energy Inc. Web Site:        

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