Ark has a network of 36 schools in Birmingham, Hastings, London and Portsmouth. Its schools include early years settings right through to sixth form. A recognition agreement between Ark and the education unions was signed in 2009, and this allows for national negotiations on pay and conditions for Ark employees. Ark does not apply School Teachers' Pay and Conditions Document (STPCD) arrangements with regard to pay and working time. Ark has, instead, its own separate pay and conditions structure which, over the years, has developed some similarities with the STPCD.