(ShareCast News) - SDL's founder and chief executive officer Mark Lancaster will step down from the board and his role as CEO with immediate effect and will be leaving the company at the end of the month.SDL said it will shortly appoint an international search firm to identify suitable candidates for the position of CEO, but in the meantime, current non-executive chairman David Clayton will assume the role.Clayton said: "With Mark stepping down, new leadership will be appointed to take the company to the next phase in its development."The customer experience management services company said that as per its interims on 4 August, trading for the full year remains in line with its expectations.At 1220 BST, SDL shares were up 6% at 343p.