Portfolio Committee on Police (2024, 23 October). Budgetary Review and Recommendations Report on the Private Security Industry Regulatory Authority, 2023/24. Cape Town: Parliament of South Africa.
The report records 608,977 registered active private security officers at the end of March 2024. The wiki cites the figure in South Africa on the Curve as a measure of defensive spending: security that households and firms buy privately counts in GDP as output.