(Sharecast News) - Amerisur Resources chief executive John Wardle purchased 8.12m ordinary shares in the full-cycle oil and gas company.Wardle, who took over the role of CEO back in 2007, acquired the shares at an average price of 12.31p each, for a total value of £999,966.52.Just last week, Amerisur Resources entered into a farm-out agreement with Occidental Andina - an affiliate of international oil and gas exploration and production company Occidental Petroleum Corporation.The AIM-traded firm said the agreement was across the Putumayo-9, Terecay, Tacacho and Mecaya exploration blocks, all in the Putumayo region in southern Colombia.In consideration of the acquisition of a 50% interest in each block, Occidental Andina would fund a $93.25m exploration and appraisal program between 2019 and 2021.Occidental Andina would fund 85% of the total planned 2D seismic cost expenditure of $65m, and 100% of the $38m planned drilling programme.As of 1630 GMT, Amerisur shares were 9.23% higher at 13.57p.Top Director BuysAmerisur Resources (AMER)Director name: Wardle,JohnAmount purchased: 8,125,000 @ 12.31pValue: £999,966.52Talktalk Telecom Group (TALK)Director name: Dunstone,Charles WAmount purchased: 379,593 @ 117.35pValue: £445,452.36Record (REC)Director name: Hill,LeslieAmount purchased: 101,756 @ 31.07pValue: £31,617.62Record (REC)Director name: Noyen,BobAmount purchased: 101,756 @ 31.07pValue: £31,617.62Record (REC)Director name: Wood-Collins,JamesAmount purchased: 101,756 @ 31.07pValue: £31,617.62Record (REC)Director name: Cullen,SteveAmount purchased: 26,438 @ 31.07pValue: £8,214.82Top Director Sells