Brand director Rachel Hamilton, who joined in January and was a board member, resigned last week, as did creative director Scott Parker and Kelly Hughes, who looks after PR for the club. Finance director Andrew Dixon, who resigned at the beginning of the year, left this month.
The resignations follow that of chief executive Mark Rodol, who left last month after 11 years with the company in various roles. It is understood the exodus has been sparked by a dispute over the brand's future direction between Rodol and founder James Palumbo.
At the end of last year Rodol devised a three-year plan for the business, which split it into three divisions: club, record company and product development. The entertainment brand produces CDs and audio equipment.
Palumbo, the company's major shareholder, has reverted to the role of chief executive until a replacement is found.