DUBAI - Dubai-listed ports operator DP World has became sole owner of the company which operates Southampton container terminal after it bought the remaining 49 percent stake held by Associated British Ports (ABP), the company said on Monday. DP World also said it extended the license agreement for DP World Southampton for another 25 years until 2047. The company did not disclose how much it paid for ABP’s stake. Associated British Ports is Britain’s leading port operator, with ports in England, Scotland and Wales.