Contendam will retain all of Congrex UK's existing staff and management team and all client contracts for events will remain with the new ownership.
The management team at Contendam comprises four PCO professionals who have been working closely together for over two decades, originally at Concorde Services under the direction of Sarah Storie-Pugh.
Rob Harrison will take on the title of CEO. Susan Hayden will become managing director of Contendam, Dion Basset retains the role of operations director and Caroline Mackenzie becomes business development director.
All 20 staff will remain at Contendam and the firm will be based in its current premises in Hammersmith in London and Glasgow.
Congrex UK is the UK subsidiary of global PCO Congrex Group and, under its new name, will focus on a consultative approach to providing tailored PCO and extended management services to its UK and international association clients.
Contendam CEO Robert Harrison said: "We have witnessed significant changes in the conference industry in recent years, in particular in the association sector, which demand a more agile and tailored approach to delivering events that truly deliver on associations’ wide ranging objectives.
"To achieve this effectively requires a more consultative approach to understanding association needs and significant flexibility. We believe this can be best achieved with a more independent operation capable of responding quicker to market changes.
"We chose to take the opportunity to create a new breed of consultative PCO with Contendam, combining traditional PCO values of personal approach with a contemporary approach to flexible working with different experts and consultants to ensure the optimum delivery to meet each specific clients’ needs."
Congrex UK clients include the Association of Physicians UK and Ireland, International Spinal Cord Society and British Laryngological Association.