Castle Defense 360 Security was established due in part to the increase in criminal and terrorist activity. The company believes in the absolute essential need for security solutions that provide services far beyond the traditional security guard and other security related service. Castle Defense offers home protection, access control and surveillance as well as perimeter breach services.

Castlebank Security Solutions is a security services provider. Based in the Stafford, UK, the company provides high profile security, maritime security, physical security and manned guarding.

CBI Security Limited is a family run business that was established in 1997. The company provides security services in Stoke on Trent, Staffordshire and Cheshire. It is an ISO accredited company that provide a 24 hour service that is based on high levels of reliable, trusted service partners, expert people and strict quality standards.

CCTV Monitoring Ltd combine remotely monitored CCTV and access control to secure construction sites across the UK.

CCTV Security Camera Sytems is a premium supplier of quality CCTV, GPS vehicle / car trackers, home alarms, wireless GSM alarms and car DVR / camera recorders.

CCTV has an extensive product range to cover all aspects of electronic security management. CCTV markets their own brand of CCTV equipment, import a lot of well established security products, and build up their own DVR units for quality assurance.

CDI Services are a security systems installation company based in Epping, Essex. CDI Services provide service including specification, design, installation and support of intruder alarms, fire alarms, access systems, door entry systems, CCTV, TV & satellite, IRS & MATV, telephone data netwroks & door/gate automation systems for home or business, domestic or commercial premises.

Northwest-based CDX Security provides premium concierge services, facilities management and security solutions to large-scale businesses, distribution centres, and the retail sector across the UK. Ranking in the top 5% of UK security firms following a successful Approved Contractor Scheme audit, CDX Security puts quality at the centre of its service offering and develops bespoke solutions to align with the needs and priorities of its clients.

Cellular gate access control and monitoring systems provide effective, affordable security solutions. Running on solar or AC, CellGate systems are ideal for both urban and rural locations. Since 2006, CellGate has continuously focused on expanding its product lines with cutting-edge technology, and growing its market share in the access control industry with first-to-market strategies and superior products.

Cellucci Associates, Inc. provides solutions for high technology strategic management, commercialisation of emerging technologies, micro & nanotechnology, homeland security, and aerospace and defence. The company consultants to business, industry and government in Cambridge, MA (Harvard Square) with offices in Washington, DC, Stockholm, Sweden, and Dallas, Texas.

Census Labs is an independent, privately funded company dedicated to providing highly specialized and professional IT security services. It was founded in 2008 by computer security experts with distinguished credentials and extensive prior experience. The services provided by Census Labs are different from the traditional approach to IT security. CENSUS recognises that information security threats are constantly evolving.

Censuswide is a consultancy that specialises in quantitative and qualitative market research for PR, marketing and insight purposes. They are focused on delivering quick and robust data with emphasis on quality and accuracy.

Centerprise International has developed a steadfast reputation for delivering large scale IT projects within the corporate, education, government and reseller sectors. The company also offers a number of hardware and software solutions, as well as various computer components to meet the IT needs of businesses. Centerprise focuses on building genuine relationships and delivering real value through tailored IT solutions.

Central Security offers a range of security solutions like alarm & burglar systems, access control, digital video recording (DVR), intercom systems, guard services, 24 hour ULC monitoring for burglar & fire, vehicle tracking / fleet management systems as well as helping retail loss prevention with EAS Systems (Electronic Article Surveillance), RFID, Tags, gates, Customer tracking solutions.

The Center for Adaptive Security Research and Applications (CASRA) was founded in 2008. The main aim of CASRA is to increase security and facilitation at airports and other environments involving people and technology. The goal is to consult airports, security companies, authorities or any other relevant stakeholders on how to increase security and passenger throughput, on how security officers can achieve high performance standards, etc.

Certis CISCO is Singapore's leading security organisation. The company offers a comprehensive range of security services from Auxiliary Police to a “one-stop solution” for a full range of physical, IT and data security services. The company supports the efforts of the Singapore Police Force in maintaining law and order and to enhance the security environment by providing a range of security services at the highest professional standards.

certSIGN is an accredited certification service provider. It helps protect electronic information, from online contracts and transactions to information stored on workstations and servers. Be it analysis and development of security policies or protecting sensitive data, certSIGN offers optimal products and solutions for organisations where security of information is a priority.

CG Labs is a B2B provider based in UK that focuses on transforming the products and services of traditionally analogue companies into digital ones. Ground-based and Drone capture methods including Photogrammetry, Laser Scan, Thermal and Hyper/Multi-Spectral sensors are transformed to provide the customer a digital solution that is easier to access and manipulate.