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&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.

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.

Darkbit is a renowned cloud infrastructure and security solutions firm, based out of Reston, Virginia. They deliver cloud-native security solutions and products for enterprises.

Darvis drives the world’s transition towards automation, innovation and computer vision for a more simple and efficient tomorrow. The company was founded in the heart of Silicon Valley, California, USA. They were originally established as a virtual reality company called Hashplay offering virtual reality and live streaming services.

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.

Dassault Aviation is a French aerospace, defence equipment and security systems company that shapes the future by designing and building military aircraft, business jets and space systems. They expertise as a manufacturer of both military aircraft and business jets. Creator of more than 100 prototypes in the last century, with over 10,000 aircraft delivered to 90 countries.

Data From Sky are redefining the meaning of SMART by converting any video stream into the FLOW of actionable insights. Their visual traffic framework makes users a designer of the sensor they need. Born for integration, powered by AI, and running everywhere. Follow the FLOW – their masterpiece in traffic intelligence.

Data Security Solutions offers world leading software and hardware solutions together with full range of services related to these solutions (IT consultancy, IT Security audit, selection and evaluation of the solution which fully fits requirements of the customer, implementation and technical support of the solution based on ISO/IEC 2700* standards).

Databac installs new HP Indigo 5000 series digital printing line to enable personalization of cards on demand. They manufacture and supply cards in a variety of sizes and materials depending on the needs. These can incorporate a variety of reading technologies such as: Magnetic stripe (HiCo/LoCo/Watermark Magnetics®) Contact chip – such as SLE5542, SmartCafe,ID Prime; GemClub Memo RFID – all types Barcode (2D,QR and Infrared)

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.

Data Link Technology Services, LLC (Data Link) is a voice and data communications infrastructure design, installation and service company. It is a structured cabling company for voice, data, video, sound and security. The company offers services for security systems, CCTV, access control systems and more.

DataWorks Plus provides law enforcement and criminal justice technology. They offers several options for biometric identification: iris, tattoo, voice, facial, and fingerprint. Biometric identification provides accurate identification and verification of individuals for booking and release, watch list, investigations, and inmate tracking.

As the globally renowned provider of cloud-based software and security solutions purpose-built for delivery by managed service providers (MSPs), Datto believes there is no limit to what small and medium businesses (SMBs) can achieve with the right technology.

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.

Davis Mergers & Acquisitions Group, aka, The "Graybeards," is the leading Mergers & Acquisitions firm in the Alarm and Integration industry. They've guided hundreds of alarm company owners to successful sales to the right buyers for over 30 years. Founder and owner, Ron Davis, is a well-known and popular speaker, educator and author throughout the industry.

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 Professional Systems specialises in custom electronic systems installation & integration for home and office. They also provide installation and maintenance of access & control your security system, video cameras, audio system, thermostat, lighting & more using computer or smart phone, from anywhere.

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.

- Founded in 2009, Deep Secure is privately owned UK-based security software solutions firm. Services offered include Content Threat Removal, Content Transform, Policy Enforcement, Cyber Security, Data Security, Email Content Security, Web Content Security, Portal Protection, and Deep Content Inspection.