Davis Site Security Limited was established 20 years ago by the late Kevin Davis, who gained the reputation of providing professional CCTV rental to the Construction Sector and to Vacant Sites in the West Midlands.

DC Solutions is a CCTV installer based in Luton.

De La Rue works with governments, central banks and commercial organizations around the globe in producing banknotes, product authentication fighting illicit trade and counterfeiting and in the supply of key security components to the identity industry.

Deep Knowledge Group is a consortium of commercial and non-profit organizations active on multiple fronts in the realm of DeepTech and Frontier Technologies (AI, Longevity, FinTech, GovTech, InvestTech), ranging from scientific research to investment, entrepreneurship, analytics, media, philanthropy and more.

- 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.

DeepAlert is an AI video analytics company and cloud-based system providing accurate object detection using artificial intelligence to deliver event-based, actionable alerts in real-time to enhance monitoring operations.

Delkia is a specialist engineering & technology company for safety-related & mission-critical systems. Its mission is to enable a safer, more resilient world through the provision of engineering and technological solutions.

Department for Energy Security and Net Zero (DESNZ) is focused on the energy portfolio from the former Department for Business, Energy and Industrial Strategy (BEIS), in the United Kingdom (UK) government.

Design Automator is a SaaS solution for the security systems industry that automates the engineering process, eliminates human error and delivers system wide consistency, whilst saving both time and money.

Detection Security Systems offers complete range of specialist electronic fire & security systems to meet the ever changing needs of residential, commercial, retail and industrial clients. The company provides products and services such as intruder alarms, CCTV systems, access control, fire alarms, alarm monitoring, gate automation as well as service and maintenance.

Detectnology provides a high standard of service to support crime prevention and detection across many industries and sectors.

Detectortesters is a designer and manufacturer of testing technology for fire detection systems. In-house expertise across a range of technical disciplines means they are able to constantly innovate and develop new technology to bring new ideas and solutions to both users of their products and anyone with a responsibility for fire safety.

Detego Global is the company behind award-winning Digital Forensics, Case Management, and Endpoint Monitoring solutions that are trusted by the military, law enforcement teams, intelligence agencies, and enterprises around the world. With the ever-increasing use of digital devices and the corresponding mass of data that are created, solutions have become the preferred choice for rapidly acquiring and analyzing.

DeterTech is an award-winning risk management company that uses proprietary technology-based solutions to deliver material cost savings for clients operating nationally in the infrastructure, construction, vacant property, and other sectors, across a range of security products and services.

Device Authority is a provider of Identity and Access Management (IAM) for the Internet of Things (IoT) and Blockchain. The Company also provides solutions such as data security, network access control, credential management and much more. Device Authority manufactures innovative smart, connected devices with robust security integrated from the outset.

Device Smart Ltd. have been developing Monitoring and Control Software & Middleware Platforms for over 15 years before cloud, before IOT, before "smart anything" was a buzz word.

DGS is managed and operated by this team who take a real hands on approach to all the operational aspects of each and every contract. DGS Service Solutions provide a range of outsourced Security, Cleaning and FM Solutions to a range of customers including shopping centers, offices, factories, and retail outlets.

DHS Systems Int'l Ltd, with its business title of DHS Systems International, is the rebranded name of MilSys (UK) Ltd. This title better reflects that role of the company, which is to provide DRASH mobile infrastructure capabilities and solutions for defence, security and crisis relief organizations worldwide. DHS Systems Int'l Ltd remains a subsidiary of DHS Technologies LLC, which is based in Orangeburg, New York.

Diamond Security Systems (UK) Ltd is a specialist CCTV design, installation and maintenance company.

DiffusionData is a pioneer in real-time data streaming and messaging solutions. Founded to solve the real-time systems & application connectivity and data distribution challenges experienced by companies worldwide, the company has an international team of business and technology experts. The company’s flagship offering — the Diffusion® Intelligent Data Platform, makes it easy to consume, enrich, and deliver data reliably.

Digital ID specializes in all things ID and have stock from some of the biggest names in the industry. Digital ID is one of the leading providers of ID card printers from an array of respected manufacturers, including Magicard, Datacard, Evolis, Zebra and more. The company offers access control and smart cards, ID card and visitor systems, printable and printed ID cards, software, as well as accessories.

Digital Locksmiths Limited was founded by two former members of Smart Card Solutions: Sean Kelly & Martin Strauch. The Digital Locksmiths offer an unrivalled, independent capabiltity to help our clients provide the highly reliable, feature rich and cost effective products that customers demand.

The Digital RF offers two unique comprehensive detection systems for entrance security control. These systems offer of a number of automatic inspection and detection processes which enable the identification of suspect vehicles which may be equipped with I.E.D’s and Magnetic Bombs or Tracking Devices.

Through their 24/7 Security Operations Centre, DigitalXRAID delivers cyber security strategies to organizations that enhance the security posture and reduce the risk, cost, and reputational damage of a breach.