- 4 Seasons Security
 - Lehigh Valley - Offers security systems and monitoring services for homes and businesses in Lehigh Valley and surrounding areas. - Advent Security Corporation
- Oreland - Security alarm company offering services to families and businesses.
- Allied Security
- King of Prussia - Contract security company whose officers protect commercial, industrial, governmental, and institutional assets.
- Bevan Security Systems, Inc.
- Riverside - Alarm systems. Located in Riverside, NJ.
- Fidelity Alarm
- Philadelphia - Serving commercial, residential and industrial customers.
- Protection Bureau
- Uwchland - Specialising in burglar and fire alarm systems for residential, commercial and industrial buildings.
- PX Direct
- Philadelphia - Supplies prison uniforms, restraints, and detention equipment to the public, as well as to correctional facilities and other institutions.
- Sentry Kids
- Oxford - Manufacturer of electronic fingerprinting and digital imaging systems designed for children.
- T.G. Faust Body Armor
- Reading - Body armour manufacturer for law enforcement and military.
- Vanguard ID Systems
- West Chester - Manufactures bar coded, magnetic striped, RFID cards, and key tags in a variety of formats.
- Wivenhoe Group, The
- Philadelphia - Security consulting company based in Clarksburg, New Jersey, serving the New England area. Specialises in security design, engineering, and risk assessment.
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