This list ranks the 100 British private companies with the fastest-growing sales over their last three financial years.

Founded in 1973, GSM London is a Higher Education provider that offers University-accredited Bachelors, Masters and Postgraduate degrees. Alongside offering a range of full-time and part-time degrees, GSM London is one of a limited number of providers in the UK to offer accelerated or ‘fast-track’ two-year degrees, reducing the cost of studying.

Sovereign invested in GSM in 2011 and since then the organisation has expanded substantially to meet the increasing demand for its flexible, career-focused courses. The School opened a new, state-of-the-art campus in Greenford, West London in 2010, expanded its Greenwich campus and has made significant investments in its academic offering, including establishing two faculties. More recently the School passed institutional review by the Quality Assurance Agency and it is now working towards its own degree-awarding status.