Around 22 staff are said to have acquired the group from its AIM-listed parent Hasgrove.
In London, George McGregor will continue as UK managing director and will join the group executive committee as a participant of the buyout.
The new board will be led by current CEO Fredrik Lofthagen and non–executive chairman Emmanuel van Innis.
The board is underpinned by Interel’s leadership team, consisting of 20 senior and junior managers, who together make up the majority of the company’s share capital.
Interel has offices in Brussels, Berlin, London, Paris and Prague. Interel’s UK lobbying arm changed its name from Politics International to Interel Consulting in 2010.