Wagner Group is a notorious Russian private military company (PMC) known for its involvement in conflicts such as Ukraine and Syria.
A British private security company, Olive Group specialises in risk management, security consulting, and protective services.
Academi is a well-known American private military company that gained significant attention during the Iraq War.
G4S Security is a British multinational security services company and is reportedly the biggest private military group in the world. It has about 6,20,000 employees.
Erinys gained attention for its involvement in providing security services to oil and gas companies operating in volatile areas.