Sierra Group is a service-focused company specialising in Commercial Construction, Electronic Security, and Facility Services. They operate three independent business units providing unique facility-based trade services to corporate, financial, industrial, municipal, and government institutions.

Sierra provides management consulting, outsourcing and technology services such as eyeLock. Iris recognition from eyeLock provides a range of solutions for identity management. By identifying “In-Motion” and “At-a-Distance”, authentication is similar to that using DNA while removing the false sense of security associated with using RFID cards and PIN numbers.

SigCom is a leading designer and manufacturer of emergency communication and alerting systems. For over twenty years SigCom's fire alarm, emergency communications and personnel alerting systems have been keeping people safe in towns, cities, industrial facilities and military complexes. SigCom designs, manufactures and services a wide variety of products and systems for incident & alarm reporting, mass notification and emergency communications.

Sigma - integrated systems (Sigma-IS) was established in 1991. The company deals in development, manufacturing, installation and setting-up of access control and management devices, of integrated systems of guard-alarm and fire-alarm, of scheduling and peripheral equipment remote control, and also of local optical fiber networks.

Sigma Connectivity deals in several lines of sectors like - telecommunications, security, transportation, aviation, facility management, automotive, civil defense and healthcare. Sigma Connectivity works mainly into wireless technologies and adoption of advanced R&D and component usage coming from the mobile device industry.

Sigma Fire & Security designs, develops, manufactures & distributes a range of specialist fire and security products. Sigma Fire & Security is the latest division of Evac+Chair International. Some of Sigma’s trusted key partners include GfS Germany and Vimpex UK.

SIGMA Threat Management Associates is a team of experts in behavioural threat assessment and threat management. The company provides threat assessment and violence prevention services to businesses, educational institutions, government agencies, military units, law enforcement and security professionals, and prominent individuals and family offices.

SigmaPoint Technologies Inc. provides end-to-end assembly services for highly complex electronic products within various markets including computer and embedded systems, Telecom RF, homeland security and defense, industrial controls, alternative energy and transportation. The company's executive team has over 75 years of experience in designing, development and manufacturing of electronic circuit card assemblies.

Signal Communications Ltd is a part of TeleEye Group founded in 1994. Its engaged in the development, sales and marketing of a full range of hi-tech CCTV and digital video surveillance equipment. The Group’s Quality Management System is ISO 9001:2008 certified and is committed to continuous improvement on product quality and customer service.

Signal Sciences is the fastest growing web application security company in the world. Their award-winning next-gen WAF and RASP solution protects 40,000+ applications and APIs with over 2 trillion production requests per month.

Signet Technologies was established to leverage the decades of experience of its founders and key managers into a single performance-oriented, independent resource for security and IT professionals. We are a true electronic security systems integrator and are uniquely able to provide sound system/technology recommendations to our customers and and clients that are based only on objective, unbiased analyses.

Signicat is a provider of electronic identity and electronic signature solutions. Signicat deals with authenticating users, providing electronic signing, identity proofing, and document preservation. Their goal is to enable customers to do business more effectively by delivering great user experiences for the end users and at the same time reduce the risk by using advanced security technology.

Signify is a pioneer in lighting for professionals, consumers and lighting for the Internet of Things. Their energy efficient lighting products, systems and services enable the customers to enjoy a superior quality of light, and make people’s lives safer and more comfortable, businesses more productive and cities more livable.

Sikom Software GmbH is provider for cross-platform and flexible communication solutions. Founded in 1998, Sikom GmbH is headquartered in Heidelberg (Germany) and maintains a development center in Zwickau as well as offices in Hamburg, Hannover, Wuppertal, Stuttgart, Darmstadt, Erfurt and Gera.

Silent Beacon offers emergency alert devices that give the user a sense of security and independence. It offers safety for families in the form of small alert wearables and a free app.

Silent Partner Technologies™ (SPT™) is the pioneer in RFID asset and inventory management using a variety of radio frequency identification technologies. SPT has consistently combined solid programme development proficiency, expertise in RFID technology, and integration tools to solve asset and inventory management issues for organisations large and small, local and international.

Silent Sentinel are a UK manufacture of hi-specification PT platforms and surveillance equipment. Long range detection technologies offered include video, thermal, SWIR imaging and radar for intelligent video detection. Markets served include airports, harbours, borders and utilities including oil and gas. The detection range of the Silent Sentinel radar systems make it a cost effective solution for protecting large areas.

Silentron was established in 1978 with a strongly innovative goal of creating wireless anti-intrusion electronic alarm systems. Silentron's products include control panels, phone diallers, alarm device, keypads, transmitters, accessories etc. Silentron is Italy's first wireless alarm manufacturer.

Silico envisions a world where every decision is simulated, prior to being made in the real world. Silico is the leading provider of process simulation software, working with enterprises from any sector to transform their decision-making in as little as four weeks. The Silico platform is an end-to-end solution that enables businesses to create digital twins of any business or process quickly and easily.

Silicon Image is a leading provider of multimedia connectivity solutions and services for mobile, consumer electronics and PC markets. Headquartered in Sunnyvale, California, the company develops market-leading technologies and industry standards that deliver connectivity across wide array of devices in home, office and on the go. The company offers semiconductor and IP core solutions like camera processors, RAID controller, video decoder, etc.

Silone CardTech is one card manufacturer with more than 15 years history in China. They provide smart card and token/key fobs for access control application system.

SilverNet is a UK based manufacturing company specialising in the design and manufacture of rugged, high performance cost-effective wireless and switching networking devices since 2005. Over which time SilverNet have gained an enviable reputation in the wireless market.