Lynton Cooper and sister company Eclipse Conference Management are to be integrated and rebranded as W&O Events.
A statement from W&O Events managing director Paul Bowie said the rebranding would come into effect on 31 March.
"This decision has been made in order to align the event-management and performance-improvement business to our parent company Western Oriental," said the statement.
It continued: "As many of you know the two brands have been sharing offices over the past 18 months. Integrating the two brands into one will not only gain operational efficiencies, but by bringing together these two talented teams, we are confident of further successes within our chosen markets."