Exercise of options

20 December 2019

Amerisur Resources Plc

Exercise of options over ordinary shares of 0.1p each ("Ordinary Shares") granted on 22 December 2009

Amerisur Resources plc ("Amerisur"), the oil and gas producer and explorer focused on Colombia, announces that today Giles Clarke (Chairman), Tracarta Limited (a company in which John Wardle, Chief Executive Officer of Amerisur has an interest) and Nick Harrison (Chief Financial Officer) have exercised options over Ordinary Shares (which, aggregated, amount to options over a total of 9,000,000 Ordinary Shares). Giles Clarke's and Nick Harrison's options have an exercise price of 15 pence per share and Tracarta Limited's options have an exercise price per share of 11.05 pence.

It is anticipated that the aggregate 9,000,000 Ordinary Shares will be issued and allotted after the Court sanction of the scheme of arrangement pursuant to which GeoPark Colombia S.A.S. is to acquire the entire issued and to be issued Ordinary Share capital of Amerisur. The Ordinary Shares issued pursuant to the options will be acquired by GeoPark Colombia S.A.S. under the scheme of arrangement, and as set out in the relevant scheme document sent to shareholders on 28 November 2019.

ENDS

Enquiries:

Nathan Piper, Head of Business Development and Comms Tel: +44 (0)330 333 8273 Amerisur Resources

Billy Clegg/Kimberley Taylor Tel: +44 (0)203 757 4983 Camarco

Callum Stewart/Ashton Clanfield/Nicholas Rhodes Tel: +44 (0)20 7710 7600 Stifel Nicolaus Europe Limited

Chris Sim/Alexander Ruffman/Tejas Padalkar Tel: +44 (0)207 597 4000 Investec

Paul Shackleton/Dan Gee-Summons Tel: +44 (0)207 614 5900 Arden Partners Plc