ISM Security, founded in 1974 and headquartered in Highland, Indiana, is the largest independent professional private security company operating in Northwest Indiana and the Southeast Chicagoland area. The firm is privately held and maintains a 24/7 proprietary dispatch center to support its operations across the region.
The company delivers an integrated approach to security, combining professional staffing with electronic security systems as a single-source solution. Its service portfolio includes security personnel, professional door staff, mobile patrols, event security, and consulting services. On the technology side, ISM Security provides electronic security systems and technology integration for clients seeking comprehensive protection.
ISM Security's model pairs human resources with technology solutions, allowing clients to work with one provider for both staffing and electronic systems needs. The company emphasizes its community roots and the active involvement of its management team in day-to-day operations.





