Shares in Polemos were knocked lower on Wednesday after the oil and gas investor announced executive chairman, David Lenigas, had stepped down with immediate effect. The group said the reason for his departure was so he could focus on his other duties at other public companies. Donald Strang, who is the group's finance director, will assume the role of executive chairman. The group's share price has fallen 26.45% to 0.114p by 13:16. NR