SIS Ltd. engages in the provision of security systems and solutions. It operates through the following segments: Security Services-India, Security Services-International, and Facility Management. The Security Services-India segment offers guarding, electronic security, and home alarm monitoring and response services. The Security Services-International segment focuses on guarding, mobile patrols, emergency medical response and rescue, loss prevention, and allied services. The Facility Management segment involves housekeeping, cleaning, facility operation and management, and pest control services. The company was founded by Ravindra Kishore Sinha in 1974 and is headquartered in New Delhi, India.