May 1 (Reuters) - Gran Tierra Energy Inc GTE.TO :
* ANNOUNCES REDEMPTION OF ALL OUTSTANDING EXCHANGEABLE SHARES AND EXERCISE OF REDEMPTION CALL RIGHT BY GRAN TIERRA CALLCO ULC
* ESTABLISHED REDEMPTION DATE OF JULY 5 IN RESPECT OF ALL OF ITS OUTSTANDING EXCHANGEABLE SHARES
* GTE CALLCO TO EXERCISE ITS OVERRIDING REDEMPTION CALL RIGHT TO BUY ALL OUTSTANDING EXCHANGEABLE SHARES ON JULY 4