CTG Security Matrix is an organisation devoted to providing operational advice and recommendations to guide the planning, design, documentation, installation, maintenance and future upgrades of electronic surveillance systems and control infrastructure.

Cticom Technology & Communications is a Hanoi based specialist in designing, supply and installation of security systems. The company offers security equipments such as surveillance camera system, Alarm system, anti-theft, anti-intrusion, Fire Alarm System, Access Control System, Attendance System, videoconferencing system, Audio conferencing system, System radio announcement (PA), Smart House, etc.

CTS Security Ltd has been installing and maintaining burglar alarms, CCTV and other security equipment for businesses, educational establishments and homes for over 40 years. CTS Security has vast experience of working in a wide range of industries including retail, professional services, agricultural, manufacturing, distribution and engineering as well as for public sector, education and domestic clients.

Established in 2005, Cultris Security Systems Inc. is a full-service fire, security, access control, video and communications company. They specialise in intrusion detection, access control, and video surveillance systems for commercial and residential customers.

Custodian Total Security Services supplies and installs intruder alarms, CCTV, and access control systems. It is a local independent company based in the North East of England with an area ranging from Alnwick across to Hexham and South to Durham, Cleveland and North Yorkshire serving both the domestic and commercial markets. the company also provides a full 24-hour emergency service to all customers.

Custom Alarm, part of Custom Communications, Inc., specialises in fire alarm systems, intrusion detection, video surveillance, and access control solutions for both residential and commercial owners. They provide organisations with UL certificated systems as well.

Custom Security Services is one of the South's leading independent providers of fire, security and safety systems. The company offers a comprehensive design, installation and maintenance service for all types of security related projects. With over 25 years experience the company has successfully delivered thousands of quality installations to all types of customers, including domestic, commercial, and public sector.

Cyelcor Ltd offers solutions such as CCTV, Intruder Alarms, Security Smoke Systems, Fire Alarms, Access Control, Video Door Entry Systems, Smart Home Automation, Oil & Gas Telemetry, Systems, Automated Swimming Pool Dosing. The company also provides consultancy services for home and business owners.

Cynat are an end to end security and automation solution provider for all type of commercial, industrial, organisational and domestic establishments. It deals in all type of CCTV, access control, time attendance products, fire alarms, fire hydrants, intrusion alarms, PA systems, GPS based solutions and customised software.

Cynon Valley Crime Reduction Services Limited is a non-for-profit social enterprise which is now in its 10th year of trading. It was set up to support the Charity side (Cynon Valley Crime Prevention Association) with sustainable funding, by providing security services across the country, these include fitting of security products like intruder alarm systems, CCTV, access control systems, UPVC locking systems, and key suiting/cutting services.

D-Fence Electronic Fencing and Security Systems Ltd. is an Israeli "Security-by-Technology" company that designs, develops and manufactures the most advanced Perimeter Intrusion Detection Systems (PIDS), based on an exclusive Strain Gauge Sensor technology. This proprietary technology allows us to offer highly aesthetic PIDS based on the “Open-Design” concept, and most importantly, that work with Zero False Alarms.

D-Ron Group is a leading technology solutions provider that delivers end-to-end solutions to transform its customers' ICT infrastructures. Headquartered in Singapore, the company provides a holistic suite of ICT, Surveillance Products and Services. The company is now the region’s trusted brand for the Security and Surveillance sectors. Their regional network span across Malaysia, Taiwan, Thailand, and China.

D-Tech Communications provides a wide variety of audio, voice/data, video surveillance, entry systems, wireless, and classroom sound amplification systems for all of your project needs.

D&D Security Derby offers fully licensed SIA-approved security guards that are ready to be deployed within hours upon acceptence. It provides approved contractor security services for major companies across the UK. Specialists in static guarding, it offers a cost-effective security service for the protection of UK businesses.

DA Security Systems are a family run CCTV, Fire and Alarm Business. It has been operatiing from Lee-on-the-Solent in Hampshire, UK since 1984. It has over 40yrs experience with the installation and maintenance of CCTV, Fire Alarm, Intruder Alarm, Door Entry and Nurse Call systems.

Dakak integrated systems is one of the most prominent security solutions firms in Egypt, delivering up to date products, providing cunning consultations, tailoring solutions to fit situation at hand for leading corporations and institutions throughout Africa and the Middle East. The company serves has a strong presence in aviation services, public safety, data centres, energy infrastructure and government facilities, among others.

Danaide SA is a company dedicated to providing turnkey electronic security technology solutions. The Argentina based company offers video surveillance, commercial vehicles with embedded video, capture license plates, access control, fire and alarm detection and intrusion detection to private or government sector.

DAS Technology can design, install and maintain security systems for a wide range of uses from homes, shops and offices to shopping centres, schools and car parks. They provide bespoke security solution that meets your needs, and all completely hassle free. Their nationwide network of engineers is trained to the highest standard in order to install security systems with a professional, efficient and reliable service.

DAS Technology are technology specialists with over a decades experience delivering solutions for both commercial and domestic customers. Their security division is full of specialists in CCTV, access control, door entry and fire.

Data Installers Inc. is an IT infrastructure design and network cabling Installation Company. The company specialises in the sales, service, and installation of structured voice and data cabling systems, voice and data integration, fiber work area products plus fibre optic cabling systems. Its complete CCTV surveillance system solutions provide enables users to monitor and view their office or home with computer or smartphone.

Datacomm Express is a leading provider of end to end security technology equipment in Nigeria. The company consults, supplies and installs video surveillance equipments, fire safety and protection equipment, home automation and alarm systems, access control solution including biometric, password control devices.

Since its formation in 1989, Davies Security Group has been designing bespoke security systems for its clients from all areas of the marketplace. From standalone Fire, Intruder and CCTV systems to PC-based integrated solutions, Davies Security can provide for all specifications, incorporating the latest technology from the fast moving security sector designed individually to accommodate present and future security needs.

DCI was started by a group of young entrepreneurs with an objective of providing electronic security systems / products at best price and support. At present, they are engaged in the field of security surveillance systems, security control systems, access and attendance recording systems, fire safety alarm systems, CCTV and home appliances & healthcare products.

DC Solutions is a CCTV installer based in Luton.

de Jong SICHERHEIT & IT GmbH is an innovative system house for security, information and network technology and develops, among other things, intelligent solutions for hygienic access to buildings and rooms.