According to published census data (January 2016), 9,203 pupils were on roll in the University Technical Colleges (UTCs) open in the 2015/16 academic year.
Figures for the number of pupils enrolled in each UTC are available in the underlying data of the Schools, pupils and their characteristics: January 2016 statistics, which are available from here: https://www.gov.uk/government/statistics/schools-pupils-and-their-characteristics-january-2016. For UTCs, the data is contained in the file SFR20_2016_Schools_Pupils_UD.csv. The type of establishment is given in column O and headcount figures can be found in column DW.
The figures for the numbers of pupils on roll in each UTC for the academic year 2016/17 are not yet available. We anticipate publishing this data in June 2017.