PROUD is funded by the Medical Research Council and the Public Health England.
In addition, Gilead are providing support to recruiting sites for diagnostic tests and are donating Truvada.
The study is being organised by the Medical Research Council Clinical Trials Unit, in partnership with the Public Health England. Both are not-for-profit and funded by the UK government. You can find out more at http://www.ctu.mrc.ac.uk/ and https://www.gov.uk/government/organisations/public-health-england.