Denning Electronics has solved big communications, protection, and surveillance problems by providing sales and technical support to distributors, security system integrators, engineering design firms, architects, and system users. Their specialties include outdoor intrusion detection, video and audio surveillance, video/audio/data networks and transmission, access control, and ballistic/blast/chemical/acoustic barriers.

Dennis Sage Home Entertainment offers various home theatre and automation products such as Home Theatre Design and Installation, High Performance Audio and Video Systems, Home Automation and Control Systems, 24 Hour Security and Monitoring Services, Security Systems, Whole House Audio and Video. Their featured product is the Alarm.com which helps control all of one’s home systems with the touch of a finger.

DTCC is the premier post-trade market infrastructure for the global financial services industry. From 21 locations around the world, DTCC, through its subsidiaries, automates, centralises, and standardises the processing of financial transactions, mitigating risk, increasing transparency, and driving efficiency for thousands of brokers/dealers, custodian banks, and asset managers.

Desktop Alert is a best-of-breed IP-Based alert technology which provides seamless integration with enterprise-class federated environments and shares communications and commands using standardized protocols such as XML and HTML. Some of the services offered by the company are common alerting protocol, instant messaging, video scribes and secure hosted solution.

Deterrent Technologies was founded in 1982, providing integrated electronic security systems, design, installation and service. They offer services to a vast variety of corporations, including pharmaceutical, financial, telecommunications, manufacturing and real estate sectors.

Dev Technology Group is a WOSB, SDB delivering mission-critical applications and systems. The USA based company provides broad range IT services, with specialisation in web-based application development and system modernisation, database consulting services, biometric capture and integration solutions, and BMC Remedy and infrastructure management solutions.

Developing Solutions is focused on protocol development, test, and traffic analysis. They have developed dsTest, a software platform for the rapid deployment of protocols stacks, intended for performance and functional test.

DevelopIntelligence provides technical training for software developers and related talent in more than 300 subject areas. They help enterprise organisations onboard, upskill and reskill tech talent with programmes customised to the stack, culture, and goals.

Devo is the only cloud-native logging and security analytics platform that releases the full potential of your data to empower bold, confident action. With an unrivaled scale to collect all of your data without compromise, speed to give immediate access and answers, and clarity to focus on the signals that matter most, Devo is an ally in protecting an organisation today and tomorrow.

DH2i Company is a provider of multi-platform Software Defined Perimeter and Smart Availability software for Windows and Linux. DH2i software products DxOdyssey and DxEnterprise enable customers to create an entire IT infrastructure that is “always-secure and always-on.”

Dial-N-Document is web-based documentation system provider that interfaces with services for a secure Electronic Visit Verification (EVV) solution. Dial-N-Document provides accurate time & attendance, biometric voice verification, Near Field Communication technology etc.

Dictograph is a 20-years old locally owned and operated security company providing a wide range of services for their clients. With 24/7 Dispatch, Dictograph's Professional trained Guards and Patrol service can respond to any need at any time in the Tucson and surrounding areas.

DigiFlight accelerates mission success for its government and commercial customers by leveraging innovative ideas and technologies that embrace the competitive landscape surrounding Cybersecurity, Information Technology, Aerospace, and Training.

Digital Defense’s innovative and leading-edge technology helps organisations to safeguard sensitive data and eases the burdens associated with information security. Digital Defense also provides Vulnerability Management as a Service (VMaaS) platform, which delivers consistently accurate vulnerability scanning and penetration testing.

Digital Guardian is a manufacturer of security software protecting data around the globe. They help companies choose the right data protection solution. Their patented Digital Guardian platform radically improves ones defence against all threats.

Digital Harmonic is a pioneer in the space of image and signal processing. Leveraging its proprietary and patented technologies, Digital Harmonic provides advanced analytics of images and signals yielding unprecedented insights that drive time-sensitive and critical decisions for its customers in the Defense, Intelligence Community, and Healthcare sectors.

Digital Projection has been instrumental in the development and application of Digital Light Processing™ technology by Texas Instruments for projection systems. Digital Projection International introduced the world’s first 3-chip DLP® projector in 1997, and has since delivered expert system engineering and world-class customer services, thus maintaining its position as a digital imaging pioneer.

Digital Shadows minimises digital risk by identifying unwanted exposure and protecting against external threats. Organisations can suffer regulatory fines, loss of intellectual property, and reputational damage when digital risk is left unmanaged. Digital Shadows SearchLight helps users minimise these risks by detecting data loss, securing their online brand, and reducing attack surface.

Digital Surveillance Solutions is committed to leading edge network-based technology and delivers quality, intelligent and cost effective solutions. The services DSS provides include consultation, systems integration, and support services. The company offers products such as cameras and accessories, video encoders, video capture head end, networking, IP video storage, and access control systems.

Founded in 1996, DigitalPersona, Inc. is a global provider of endpoint protection solutions and biometric authentication products that make strong security simple, practical and affordable for businesses of all sizes. The company's solutions help enterprises, government agencies, custom application developers and independent software vendors to efficiently address growing security, compliance and fraud-prevention demands.

Dignari, LLC was founded with one primary goal - distinguish our clients by supporting them through the successful delivery of mission critical security programs. They strive every day to ensure their clients are known for delivering model programmes within their mission space.

Direct Protect Security & Surveillance provides state-of-the-art security systems for residential and commercial buildings. They also offer advanced technology video surveillance capabilities, burglary and fire system notifications, two-way voice technology and medical alert monitoring solutions.

DirectDefense offers leading security services that are unmatched within the industry. Their core strength is the deep experience in performing assessments for a wide array of networks, platforms, and applications. With the extensive experience, their core service offerings have been aligned to address the client needs by covering many of the important security domains within the information security workspace.

As cyber risks evolve and become increasingly interconnected, traditional security measures remain static and compartmentalized. Discern Security's innovative platform empowers to visualise security configurations while facilitating dynamic, ongoing policy management across an arsenal of security tools.

DST’s mission is to deliver technology solutions that transform predictive & planned maintenance by offering patented technology that redefines how ultrasound is gathered and utilised. Its easy-to-use, self-calibrating ultrasound diagnostic system empowers technicians with real-time information to predict equipment failure, extend equipment life and lower total costs.